CN108486068A - A kind of Strain 3 of Canine Distemper and its application - Google Patents

Abstract

The present invention provides a kind of Strain 3 of Canine Distemper, and deposit number is CCTCC NO:V201814；1 plant of the QN that the present invention is screened is used to prepare vaccine.1 plant of the canine distemper live vaccine QN of the present invention has stable biological characteristics; and there is good immunogenicity; securely and reliably; the antibody of higher level can be generated; duration is long; and there is extraordinary protecting effect to the canine distemper mink that GN plants of poison attacks poison by force; the morbidity and mortality of mink significantly reduce after immune; its immune effect reaches or better than existing commercialized vaccine in the market; prevalence and the propagation of mink canine distemper can effectively be prevented; economic loss caused by reducing this disease, has broad application prospects.

Description

A kind of Strain 3 of Canine Distemper and its application

Technical field

The invention belongs to veterinary biological product preparing technical fields, and in particular to a kind of Strain 3 of Canine Distemper and its application.

Background technology

China Fur Animal Feeding industry starts from nineteen sixty-five, has 50 years development histories till now.It is supported in China fur-bearing animal Grow industry development quickly, raising type is on the increase, and quantity increases year by year, mainly concentrates Shandong, Liaoning, Heilungkiang, Hebei etc. The principal item on ground, raising has mink, silver fox, recoon dog etc..According to incompletely statistics, the current whole nation possesses on Fur Animal Feeding family Wan Jia, various fur-bearing animal livestock on hands about 40,000,000, wherein mink just has 20,000,000, has become one and qualified supports Grow big country.

Canine distemper (Canine distemper, CD) is the canine distemper virus (Canine by Paramyxoviridae Distemper virus, CDV) caused by Canidae, the acute, hot of Mustelidae and part Procyonidae animal, high degree in contact infect Disease.It is mainly characterized by biphasic or bipolar type fever, the mucosal inflammations such as inflammation, nose, alimentary canal and catarrhal pneumonia, skin eczema and god Through symptom.Canine distemper virus belongs to Paramyxoviridae (paramyxoviridae family) Morbillivirus (Morbillivirus), viral genome is the strand RNA of non-segmented negative, and virion is rounded or irregular shape, sometimes In long Filamentous, 120~300nm of diameter.Particle centre contains the spiral shape nucleocapsid of wide 15~17nm of diameter.Carre head in 1905 Secondary discovery canine distemper virus, therefore this disease is also referred to as carre diseases.Successively sent out in the fur-bearing animals such as the black fox of silver, racoon dog, sable, Arctic fox Raw canine distemper.Have been reported that confirmation has detected canine distemper virus nucleic acid in the tissue of patient for suffering from Pagets diseases.It can be seen that dog The host range of pest heat expands constantly, and pattern of infection is increasing.In recent years, with China army dog, police dog, experimental dog With increasing considerably for pet dog breeding amount and increasing for strange land exchange, incidence of the canine distemper in China dog and lethal Rate has raised trend, and clinical manifestation also with it is previous different.The disease is at present to China's canine farming, fur-bearing animal Aquaculture and conservation of wildlife industry endanger one of maximum epidemic disease, in widespread attention.

Mink canine distemper is canine distemper virus (the Canine distemper by paramyxovirus section Morbillivirus Virus, CDV) caused by a kind of highly contagious disease acute, hot, infectiousness is extremely strong, be the main of feedwater ermine aquaculture One of infectious disease.In recent years, with the continuous expansion of various regions Fur Animal Feeding scale, the incidence of mink canine distemper have by Walk the trend risen.Due to therapy of the mink canine distemper without special efficacy, vaccine inoculation carries out preventing to be particularly important.

Popular mink canine distemper vaccine is mostly inactivated vaccine on domestic market, and the immune effect of generation is held time It is shorter, do not generate local antibody.And inactivated vaccine needs multiple injection, needs amount of antigen bigger, cost is higher.And weak poison epidemic disease living Seedling can stimulate body to generate stronger humoral immunity and cellullar immunologic response, and inducing immunological memory has good immunogenicity. Some researches show that there are larger differences for the antigen protein of domestic prevalence canine distemper street strain and commercial vaccine strain.Therefore, it is necessary to Consider whether the existing canine distemper attenuated vaccine used can prevent constantly variation, the ever-expanding canine distemper virus of natural reservoir (of bird flu viruses) Infection, developing existing high security again has the attenuated vaccine of good immunogenicity to have important practical significance.Study mink dog The hot live vaccine of pest is of great significance to China's feedwater ermine aquaculture.

The Strain 3 of Canine Distemper of existing development is mostly that the canine distemper velogen strain that will be detached is fitted through cell or the multiple passage of chicken embryo Answer and cause it is weak obtain, long the time required to viral Attenuation, heavy workload can have a such as bacterium during Attenuation The influence of the uncertain factors such as pollution.There is likely to be virulence wild effects for the strain of Attenuation, if strain is impure, mix The virion for having strong virus force may result in the immuning failure even prevalence of epidemic disease.If it is possible to be directly separated one plant Attenuated vaccine strain greatly reduces the workload of vaccine development, and strain is purer, reduces the possibility for leading to pestilence.

Invention content

The object of the present invention is to provide a kind of Strain 3 of Canine Distemper (QN-1 plants) and its application, the QN-1 strains screened to have The characteristics of safe and good immunogenicity, the vaccine prepared can solve inactivated vaccine immune effect and hold time It is short, the problems such as cost is higher.

QN-1 plants of canine distemper virus Caninedistempervirus CDV provided by the present invention, April 11 in 2018 Day is deposited in the China typical culture collection center positioned at Wuhan, Wuhan University, deposit number：CCTCC NO:V201814；

The QN-1 strains, viral seed culture of viruses content >=10^5.0TCID₅₀/ml；

The QN-1 strains that the present invention is screened are used to prepare vaccine.

Further aspect of the present invention provides a kind of vaccine, is prepared as antigen with QN-1 plants.

The vaccine is freeze dried vaccine.

(QN-1 plants) of the canine distemper live vaccine of the present invention has stable biological characteristics, and has good immunogene Property, securely and reliably, the antibody of higher level can be generated, the duration is long, and has to the canine distemper mink that GN plants of poison attacks poison by force There is extraordinary protecting effect, the morbidity and mortality of immune rear mink significantly reduce, and immune effect reaches or is better than Existing commercialized vaccine in the market can effectively prevent prevalence and the propagation of mink canine distemper, be passed through caused by reducing this disease Ji loss, has broad application prospects.

Description of the drawings

Fig. 1：QN-1 plants of CDV and CDV3 plants of H gene sequence alignment result figures；

Fig. 2：QN-1 plants of CDV and type strain H gene consecutive nucleotides comparison result figure；

Fig. 3：QN-1 plants of H gene sequence alignment result figures of CDV.

Specific implementation mode

The present invention is described in detail with reference to embodiment.

Embodiment 1：The separation identifications of mink canine distemper virus QN-1 low virulent strains and clone purification and immunity test this implementation Material used in example is as follows：

Standard strain：Onderstepoort plants of CDV, is preserved by Qingdao Agricultural University laboratory.

Attack poison velogen strain：GN plants of CDV (internal organs poison, ID50≤10^-2/ ml), it cultivated, identified simultaneously by Qingdao Agricultural University Keeping.

Immune serum：QN-1 plants of rabbit-anti CDV (Strain of this clone purification) positive serum is made by oneself by our unit；Rabbit Anti- CDV Onderstepoort plants of positive serums are made by oneself by our unit.

Vero cells, are provided by Agricultural University Of Nanjing.Culture solution is the MEM containing 5% calf serum.

Mink is provided by Qingdao Agricultural University Animal Science And Technology experimental animal station.

One, the screening of Strain

Shandong Province Zhucheng farm mink, about 60 ages in days or so.Not immune mink canine distemper vaccine product, mink group There is doubtful canine distemper symptom, eye, nose have apparent secretion, anorexia, asoscope drying, but do not occur mink death, Suspection is infected by mink canine distemper virus low virulent strain.

Viral screening is carried out to the sample obtained from the farm.

It is as follows to screen the reagent used：

Plaque purification reagent：Agarose, the production of TaKaRa companies；Dimethyl diaminophenazine chloride, Japanese Wu Tian companies production.

Cell culture medium：Without phenol red MEM culture mediums, the production of Yixing Sai Er biotech companies.Wherein cell growth Liquid is the MEM cell culture fluids containing 10% calf serum, and cell maintenance medium is the MEM cell culture fluids of serum-free.

Bacteria culture media：THIOGLYCOLLIC ACID salt (T.G) tubule, the inclined-plane peptone from casein agar (G.A), dextrose peptone medium (G.P) People's Republic of China's veterinary biologics quality standard method is pressed to prepare.

Mycoplasma culture medium：It is configured to fluid nutrient medium by People's Republic of China's veterinary biologics quality standard method And solid medium.

1, the separation identification of mink canine distemper virus QN-1 low virulent strains and clone purification and immunity test.

1) viral separation euthanasia mink, takes the tissue samples such as brain, lungs, liver, the spleen of ermine, with containing dual anti- The PBS of (2000IU/ml penicillin and 2000 μ g/ml streptomysins) is rinsed 3 times, by 1 after fully shredding：3 ratio is added containing double Anti- PBS, is ground into emulsion, 5000rpm, and 4 DEG C of centrifugation 10min take supernatant, 0.2 μm of hole filtration sterilization, preserved at -20 DEG C for point It is used from virus.After taking Vero cells to grow up to 80% single layer by normal passage, culture solution is discarded, by the 10% of nutrient solution volume score The sample for waiting for virus purification is added.After 37 DEG C of absorption 1h, the MEM culture solutions containing 5% calf serum are added, are placed in 37 DEG C of 5%CO₂ Under conditions of cultivate, day by day observe cell whether occur the lesions such as merging, draw in the net, fall off.As a result, 10 times of dilute samples of pathological material of disease Growth regulation starts visible apparent multinucleate giant cell in 4 days on Vero cells, and visible cell fusion and sky are grown on Vero cells Bubble denaturation, and plasomidum is formed, the 7th day, sick cell fell off, in seine shape.Uploaded for 3 generations in Vero cells, often for visible phase Same CPE.

2) when different cultivated days CPE observations carry out different receipts poison from toxicity test with the 3rd generation culture of Vero cells pair Between comparative test：Vero cell monolayers meet CDV, and it is 1ml, nutrient solution 10ml to connect poison amount.It is micro- in being inverted at the 3rd, 4,5 day respectively Microscopic observation cytopathy situation, and take a picture.It receives poison within 4th, 5,6,7 day, measures the different TCID for receiving the malicious time₅₀.As a result, connecing poison Without apparent CPE, a small amount of cell is assembled within the 4th day, and culture solution is limpid within first, second and third day afterwards, and a large amount of cells are poly- within the five, the six days Collect agglomerating, culture solution has a small amount of muddiness, shows that virus starts shedding off.Cell almost all falls off within 7th day.Difference receives malicious period Poison is received, TCID50 is in increasing trend, and with the 7th day highest, virus is different to receive malicious time and TCID₅₀The relationship of value see the table below 1.

The TCID of 1 different times culture of table₅₀Value

3) inclusion body inspection takes the 3rd generation culture of Vero cells of isolated viral strain that film flying is made, and dries, methanol is fixed 5min is added dropwise hematoxylin dye liquor and dyes 15-20min, distilled water flushing, 0.1% hydrochloride alcohol liquid color separation, ammonium hydroxide oil blackeite, Yihong 1-5min is redyed, 95% alcohol breaks up 5min, oily microscopic observation result.As a result, nucleus is in lilac, cytoplasm is in light rose Color, visible red, round or ovate inclusion body in endochylema.

4) Electronic Speculum observation takes the 3rd generation culture of Vero cells of isolated viral strain through freeze thawing three times, and 3000rpm centrifuges 15- 20min takes supernatant to be added in the ultracentrifugation pipe of 30% sucrose shop fixtures, and 35000rpm is centrifuged 2.5 hours at 4 DEG C, takes precipitation Object is suspended with 0.1ml PBS, 2%PTA negative staining, Electronic Speculum observation.As a result, it is seen that circular virion has cyst membrane, cyst membrane There is fibre prominent on surface, virus nucleocapsid is crimped onto in cyst membrane, and virus surface has the arrangement of class crystalline, is in typical CDV virions Sub- form.

5) viral physical chemistry characteristic experiment takes the 3rd generation culture of Vero cells of isolated viral strain, carries out viral core respectively Acid type qualification test, ether sensibility and acid resisting test.

Viral nucleic acid type qualification test：Vero cells grow up in 96 porocyte culture plates of single layer, change cell growth maintenance 100 holes μ l/ of liquid, are divided into two row, and the virus (10 that row are inoculated with different dilutions is pressed in 6 holes of each column/row respectively^-2~10^-7)25μl/ Hole, 6 holes add 5-FU (FUDR) before each dilution, make its final concentration of 50 μ g/ml, hereafter observe CPE day by day. As a result, plus FUDR virus 10^-4When generate CPE, the dilution that comparison virus generates CPE is 10^-5Three holes, 10^-4Two holes, then press down Titre processed is less than 1 logarithm, illustrates that the isolated strain is RNA virus.

Ether sensitivity test：Virus liquid 0.8ml is separately added into two XiLin bottles, thereto one bottle of 0.2ml that adds diethyl ether, Two bottles stopper 4 DEG C of postposition 24 hours with rubber stopper, therebetween nonoscillatory.The bottle to have added diethyl ether is divided into two layers：Upper layer is ether, Lower layer is virus liquid.Entered in another bottle with pipette, extract virus liquid, it is appropriate to blow and beat, so that remaining ether is volatilized, at ether The virus liquid and comparison virus liquid of reason survey TCID simultaneously₅₀.As a result, the virus liquid TCID of ether processing₅₀It is 10^-1.33, comparison virus Liquid TCID₅₀It is 10^-5.0.Illustrate that this virus is sensitive to ether.

Acid resisting test：Virus liquid equivalent is sub-packed in three XiLin bottles, with 0.1mol/L HCl by the disease in two bottles The pH of venom is adjusted to 3.0 and 5.0 respectively, and another bottle adds considerable amount of sterile saline to compare.After room temperature sense is made 1 hour, Use 7.5%NaHCO₃Solution tune pH to 7.2, surveys TCID respectively₅₀.As a result, the virus liquid TCID that pH is 3.0₅₀It is 10^-2.0, pH TCID when 5.0₅₀It is 10^-4.5, control group TCID₅₀It is 10^-5.33.Illustrate that this virus is relatively stablized in pH 5.0, not in pH 3.0 Stablize.

6) molecular Biological Detection

With reference to CDV Onderstepoort (AF305419) pnca gene sequence, using Oligo7.37 softwares in CDV H bases Because of the specific primer of the opposite conserved regions design pair for amplification H gene code area at both ends,

P1(CDV-H-F(7075-7095))：5 '-AACAATGCTCTCCTACCAAGA-3 ',

P2(CDV-H-R(8975-8995))：5 '-AATGCTAGAGATGGTTTAATT-3 ', amplification length 1921bp.

The malicious 3rd generation Vero cell culture of separation is taken, its TCID is surveyed₅₀It is 10^-6.0/ml.It is added by 200 μ l cell cultures 500 μ l TRIzol reagents, 15~30 DEG C of standing 5min.It is imitative by 0.2ml/1ml TRIzol chlorinations, firmly shake test tube 15 with hand Second, 15~30 DEG C of 2~3min of standing.2~8 DEG C of 12,000 turns of Centrifuge A sample 15min.After centrifugation, mixture is split into down Layer is red, phenol chloroform middle layer, upper layer colorless layer.Colorless layer is to another new centrifuge tube above for transfer, by 0.5ml/ 1mlTRIzol adds isopropanol, by precipitating RNA, -20 DEG C of standing 30min after being mixed with isopropanol from water phase.2~8 DEG C 12, 000 turn of Centrifuge A sample 10min forms RNA precipitate in tube wall or tube bottom.Supernatant is abandoned, 75% second is added by 1ml/ml TRIzol Alcohol washing RNA is primary, 2~8 DEG C of 7500 turns of Centrifuge A sample 5min.Abandon supernatant, dry RNA (not being completely dried).At DEPC 10~20 μ l dissolvings of water managed, -70 DEG C of preservations.Simultaneously CDV standard strains are set to compare.

In 20 μ l reverse transcription systems：MgCl₂2 μ l, RNase Free of (25mM) 4 μ l, 10 × RNA PCR Buffer dH₂O(DEPC-H₂O) 0.5 μ l, AMV of 7.5 μ l, dNTP mixture (2.5mM), 2 μ l, RNA Inhibitor (40U/ul) 1 μ l of Reverse Transcriptase XL (5U/ μ l), downstream primer or OligodT 0.5 μ l, 2.5 μ l of RNA sample.Fully Enter in PCR instrument after mixing, 42 DEG C of 1h, 99 DEG C of 5min, 5 DEG C of 5min, 4 DEG C of 5min.

PCR reacts 20 μ l of total volume：MgCl₂1.5 2 μ l, dNTP mixture (2.5mM) of μ l, 10 × Buffer 1.8ul, DEPC-H₂10.2 μ l of O, 3 μ l, P1P2 mixtures of Taq enzyme (5U/ μ l, TaKaRa Products) 0.5 μ l, RT product are total 1μl.Each element dosage in PCR cycle parameter and PCR reaction systems is selected, finally determines the most suitable journey of PCR Sequence is：Then 96 DEG C of pre-degeneration 5min start to expand, 94 DEG C of denaturation 1min, 61 DEG C of annealing 1min, 72 DEG C of extension 1min 20s, Totally 40 cycles, last 72 DEG C of 10min, 4 DEG C of 5min, -20 DEG C save backup.

PCR product is identified：PCR product is identified using agarose gel electrophoresis method.Prepare 1 × TAE containing agarose 1.5% EB working solutions are added to final concentration of 5 μ g/ml in liquid.RT-PCR amplified productions and bromophenol blue sample loading buffer 4：After 1 mixing, with 2000bp Marker are compared, point sample.Voltage of voltage regulation is 80V, and after about 20min, observation is as a result, gel under ultraviolet transilluminator It takes a picture on automated imaging instrument.And PCR product is cloned on pMDT-18 carriers and is sequenced, sequencing result and GenBank are included CDV H gene sequence alignment analysis.As a result, the nucleic acid electrophoresis band being consistent with expected amplified fragments (1921bp) is obtained, and to sequence Row are measured, and nucleotides sequence is classified as SEQ ID NO:1, the amino acid sequence of coding is SEQ ID NO:2.By to its H The gene sequencing of albumen is found, on major antigenic sites, the amino acid sequence of CDV QN-1 Strain and report both at home and abroad The separation strains in road have larger difference, have compared with CDV3 and are made a variation at 14, P10-A10, P18-A18, Q29-E29, Q215- E215, A269-T269, S295-L295, A436-G436, Q441-E441, A457-G457, Y525-S525, D526-V526, H540-D540, P550-S550, P583-A583, it is shown that viral variation.Wherein Y525-S525 and D526-V526 the two Mutational site is happened at the receptor key area of host cell combination, can influence the combination of CDV and host cell, this is likely to The reason of causing CDV QN-1 virulence to reduce.The variation of other relative specifics is less with strains of pathogenic Journal of Sex Research, however not excluded that its phase Guan Xing.

7) the proliferation rejuvenation of the original poison of CDV separation strains and its titer determination are fitted seed culture of viruses with the MEM culture mediums without serum Work as dilution, be inoculated in culture and cover with for 24 hours on the Vero cells of intensive single layer, after every bottle of inoculation 1ml, 37 DEG C of absorption 1h, discards disease Venom washed once with the MEM culture mediums without serum, then MEM culture medium of the addition containing 5% newborn calf serum, 37 DEG C, 5%CO₂Under the conditions of continue to cultivate；Setting normal Vero cells does blank control simultaneously.Start to observe afterwards for 24 hours, works as cytopathy (CPE) up to 80% when, freeze thawing harvests virus liquid three times.After taking the virus liquid after harvest to do 10 times of gradient dilutions, suitable 5 are taken Dilution measures its TCID with 96 porocyte culture plates₅₀.As a result, the original poison of separation strains tends to after 1~2 generation of Vero cells rejuvenation Stablize, CPE occurs in 48~56h after connecing poison, and 120~168h CPE show as the contracting of cell circle up to 80%, CPE, fall off.Through multiple Measure malicious valence, TCID₅₀10^4.5~10^5.9Between/ml.

Two, viral clone purification

1, the Vero cells of single layer are just covered in the preparation pancreatin digestion of the attached cell of virus infection, and cell training is added Cell suspension is made in nutrient solution, is added in 24 porocyte culture plates；It takes and the cell culture of clonal virus is diluted to 10^-1、 10^-2、10^-3Three dilutions, are inoculated in the plate for covering with Vero cell monolayer, each plating 0.1ml, each to dilute It is primary gently to shake plate per 15min therebetween, discards supernatant liquid by degree 3 plates of inoculation, 37 DEG C of absorption 1h, are added maintaining liquid, 37 DEG C, 5%CO₂Under the conditions of continue to cultivate.Do 10 times be serially diluted after, be separately added into 24 orifice plates by extension rate, each dilution is done 2 holes, the amount for pressing 10% synchronize inoculation, if 1, the normal cell controls hole of non-virus inoculation, set 37 DEG C, 5%CO₂Under the conditions of Culture.After cell adherent good (culture about 10h), culture solution is discarded, is rinsed 2 times, is rinsed with without the phenol red MEM liquid of serum Afterwards, the temperature that thawing is added is 45 DEG C, serum content is 2% without phenol red MEM nutrient agars (per hole 0.8mL), the 5th day When, the pancreatin content of 1/5 volume is added as the 1/8000 MEM nutrient agars dyeing containing dimethyl diaminophenazine chloride.

2, after the expansion culture Plaque Formation for choosing spot and clone strain, different size of plaque is selected.It is being cultivated with marking pen The plaque position different to the diameter to be selected marks (plaque for choosing spot can only use neutral red staining) on plate, Then plaque is drawn with suction pipe；The plaque Ago-Gel of absorption is put into the culture dish of sterilizing, simultaneously with the excision of sterilizing blade The Ago-Gel without viral side is discarded, keeps the gel layer containing virus very thin, is removed and placed in green bottle, 0.5mL battalion is added Nutrient solution, freeze thawing 3 times synchronize in 24 well culture plates and are inoculated with Vero cells, after lesion to appear, receive poison, then expanded with culture bottle Culture, using the condition of plaque can be formed, to acquired Plaque Clone strain clone 3 times.As a result, after cloning 3 times, meat is obtained The visible plaque of eye.Plaque form is relatively regular, slightly rounded.It is straight to be broadly divided into three plaque of large, medium and small spot according to spot diameter size Diameter is the clone strain of 2.00~2.75mm, 1.00~1.33mm and 0.40~0.75mm.It is respectively designated as QN-1 plants of CDV, CDV QN-2 plants, QN-3 plants of CDV.

3, the Electronic Speculum of clonal strain is observed is inoculated in Vero cell monolayers by clonal strain, when CPE is up to 80%, pours out Culture solution, is added a small amount of PBS buffer solution, and after multigelation 3 times, 3000rpm centrifuges 30min, takes supernatant to carry out phosphotungstic acid negative Contaminate scanning electron microscopic observation.As a result, the spherical virus particle seen.

4, clonal strain titer determination is carried out with 96 orifice plates according to 2.1.7 methods.It the results are shown in Table 2.

2 CDV strain clone strain titre testing results of table

Titre testing result shows that QN-1 plants of titres of CDV are apparently higher than other two plants, is established for the research of follow-up attenuated vaccine Good basis is determined.

5, clonal strain is pure examines by existing《Chinese veterinary pharmacopoeia》The method of annex carries out bacteriologic test, mould is examined, Mycoplasma is examined and exogenous virus is examined.As a result, being polluted without bacterium, fungi, mycoplasma and exogenous virus.

6, the stability test of clonal strain proliferative ability chooses the highest clone strain of titre and carries out this experiment.By clonal strain Continuously passed for 20 generations on Vero cells, carrying out a virus titer every 5 generations measures.3 are the results are shown in Table, shows QN-1 plants of CDV's Proliferative ability is good.Each generation virus is set -70 DEG C and is saved backup.

Table QN-1 plants of proliferative ability test results of 3 CDV

Three, Study On Immunogenicity

1, the Small Volume Serum cross neutralization test (SN) of separation strains takes 12 monthly age ermine 4, with CDV-Onderstepoort plants Attenuated vaccine immunity prepared by cell culture, it is primary at interval of 15d booster immunizations, it is immunized 3 times repeatedly, the skin on the outside of hind leg shin Lower venous blood collection, Small Volume Serum neutralization test detects serum neutralize antibody titers, up to 1:Blood sampling separation serum when 100 or more, -20 DEG C freezen protective is spare.The 3rd generation culture of Vero cells for taking isolated viral strain is carried out with fixed virus-diluted blood heat-clearing method：With 96 porocyte culture plates, by 1:4 are serially diluted positive serum, 25 holes μ l/, while adding about 200,25 holes μ l/ TCID₅₀Separation Virus, 37 DEG C of senses are made 1 hour, Vero cells (about 12000) are added by 50 holes μ l/, in 5%CO₂, cultivate at 37 DEG C, 4~7 Its observation CPE, while setting normal Vero cells and negative serum control hole.As a result, normal Vero cell growths are normal, do not heal The clear control wells for only adding virus liquid generate apparent CPE, and plus the control wells of virus liquid increase serum have no and generate CPE, and sick Venom does not generate apparent CPE in serum and hole.At this time can the preliminary judgement isolated viral be CDV, the CDV strains of separation with CDV-Onderstepoort plants of generation antibody neutralization reactions, show that two kinds of Strain have cross antigenicity.

2, clone strain viral cultures are diluted to 10 by the Study On Immunogenicity of clonal strain^3.5TCID₅₀/ ml, it is subcutaneous to note Penetrate 45~60 age in days health mink (neutralize antibody titers≤1:4) 5,1mL/ is only subcutaneously injected, while setting up control group (injection Physiological saline 1ml), 21 days after being immunized, with 100 ID₅₀CDV (GN plant) attacks of strong poison, observe 21, observation immunoprotection feelings Condition.As a result, 21d uses strong virus attack, QN-1 plants of immune groups of CDV to obtain 100% protection respectively after immune, RT-PCR detects excrement Do not occur positive band；Control group is all fallen ill, and positive band occurs in RT-PCR detection excrement.Show CDV QN-1 low virulent strains With preferable immunogenicity.The result is shown in tables 4.

Table QN-1 plants of Study On Immunogenicity results of 4 CDV

3, the safety testing of clone strain selects 45~60 age in days health mink (neutralize antibody titers≤1:4) 8, In 5 culture solution 5ml of the CDV QN-1 low virulent strains on Vero cells, another three hypodermic injections 5ml waters for injection is subcutaneously injected As a contrast.Observation inoculation ermine body temperature, excrement, the appetite state of mind, foot pad character and death condition daily.It is observed continuously 21 Day.It lives as a result, all inoculation mink is strong, part is without redness, and spirit is without exception, and diet, excrement are normal.Show canine distemper attenuated QN-1 plants of strain is safe to mink, mink will not be caused to fall ill.The result is shown in tables 5.

Table QN-1 plants of safety testing results of 5 CDV

Embodiment 2：The virulence of mink QN-1 plants of seeds culture of viruses of canine distemper CDV returns strong experiment

Used seed culture of viruses：QN-1 plants of CDV, the 5th generation basis seed culture of viruses (minimum generation)；

Vero cells are provided by Agricultural University Of Nanjing, and culture solution is the MEM containing 5% calf serum.

Experimental animal：Susceptible mink (neutralizing antibody≤1 CDV of 5 monthly ages health:4), it is purchased from Weihai mink farming field.

1, the virulence of QN-1 plants of seeds culture of viruses of mink canine distemper CDV returns strong experiment

1) CDV QN-1 strain virus assay

QN-1 plants of freeze-drying seed culture of viruses CDV is restored into commercial weight with sterile saline, appropriate to dilute, each dilution inoculation Each 1 bottle of Vero cells, every bottle of inoculation 1ml are discarded virus liquid, are washed with the MEM culture mediums without serum after 37 DEG C adsorb 1 hour It washs once, the MEM culture mediums containing 5% newborn calf serum is then added, continue to cultivate under the conditions of 33 DEG C；Set normal Vero simultaneously Cell does blank control.Start to observe after 24 hours, when cytopathy (CPE) is up to 80%, 3 harvest virus liquids of freeze thawing.It takes After virus liquid after harvest does 10 times of gradient dilutions, 5 suitable dilutions is taken to measure its TCID with 96 porocyte culture plates₅₀。 Continuous passage is to 30 generations.As a result, the viral TCID of 5~30 generation of CDV QN-1 strains₅₀10 can be reached^5.8/ml.The result shows that The virus multiplication power of QN-1 plants of CDV is stablized, and the use of vaccine seed culture of viruses is suitable as.Concrete outcome is shown in Table 6.

The viral level of QN-1 plants of passages of 6 CDV of table measures test result

2) the internal duplication after CDV QN-1 plants of inoculation minks and toxin expelling situation

By QN-1 plants of the 5th generation basis seed culture of viruses (TCID cultivated on Vero cells of CDV₅₀It is 10^5.8/ ml) water is subcutaneously injected Ermine 14,1ml/ only, while setting and not being inoculated with mink 2.It is acquired every 3d (3d, 6d, 9d, 12d, 15d, 18d, 21d) after inoculation Eye nasal discharge, urine, the excrement of mink, and two minks that are euthanized every time, aseptic collection lung, spleen, liver, lymph node, grinding Processing, extraction nucleic acid carry out CDV RT-PCR detections, detection method reference《(QN-1 plants) manufactures of mink canine distemper live vaccine and inspection Test Trial Regulation (draft)》Note 2 carries out, while inoculation Vero cells carry out disease after the sample milled processed filtration sterilization acquired Poison separation.The result shows that 9~15d after inoculation, CDV nucleic acid is can detect in the excrement and urine of mink, illustrates CDV during this Outwardly toxin expelling, 15d toxin expelling reductions later, 18d toxin expellings stop after QN-1 plants of inoculation minks, can't detect viral nucleic acid.Internal organs 6~9d can detect viral nucleic acid in lungs, spleen, liver, lymph node or be separated to disease after testing result shows inoculation Poison, and the positive rate in lungs, spleen and lymph node is high, illustrates that QN-1 plants of CDV is inoculated with after minks mainly in these three internal organs Middle duplication is detected and is detached less than virus in above-mentioned internal organs after 18d.It is shown in Table 7.

Table 7 is inoculated with the virus replication and toxin expelling testing result of mink

3) the CDV QN-1 plants of subinoculations to mink are tested

By QN-1 plants of the 5th generation basis seed culture of viruses (TCID cultivated on Vero cells of CDV₅₀It is 10^5.8/ ml) subcutaneous multiple spot note Jetting ermine 3, only, isolated rearing 10d observes the variation feelings such as the state of mind, appetite, body temperature, excrement of mink to 10ml/ daily Condition observes euthanasia experiment mink after 10d, and aseptic collection lymph node, brain, lungs, spleen, liver tissue sample add PBS to grind At 1:5 tissue suspension, multigelation 3 times, 6000rpm centrifuge 30min, take supernatant to carry out negative staining electron microscope observation, take simultaneously Supernatant is inoculated with Vero cells, observes cytopathy situation.

It will be observed that the inoculation mink tissue supernatant of CDV virion and generation cytopathy is inoculated with mink 3 again, Only, isolated rearing 10d is peaceful and comfortable after observation 10d daily situations such as the state of mind, appetite of observation mink, Temperature changing by 10ml/ Dead experiment mink, aseptic collection lymph node, brain, lungs, spleen, liver tissue sample, by preceding method carry out sample treatment with The continuous subinoculation of mink, repeatedly, continuous 5 subcultures in mink body.After last time inoculation test mink, continuously Observe 21d.The situations of change such as the state of mind, appetite, body temperature, the excrement of per generation observation mink.Such as it is inoculated with the morbidity of mink canine distemper Standard can determine that experiment mink infection canine distemper, i.e. CDV QN-1 plants of virulence return by force.The subinoculation experiment of each generation is not The blank control mink of virus inoculation 2.

The genome of CDV encodes 6 protein gene successively, and wherein H gene encodes hemagglutinin, plays and CDV receptors The key effect that SLAM is identified and combined.Since H gene variation is frequent, so it is considered as the weight for causing CDV constantly to make a variation Want factor.This research takes the internal organs of 1~5 pickup kind mink to grind supernatant, extracts viral RNA, and RT-PCR expands CDV QN-1 Strain hemagglutinin protein gene, and sequencing analysis is carried out, judging H gene virulence related amino acid sequence, whether there is or not variations, evaluate CDV The QN-1 plants of genetic stabilities in mink interior generation.

As a result CDV QN-1 plants of basic bacteria the 5th generation seed culture of viruses (TCID₅₀It is 10^5.8/ ml) continuously passed for 5 generations in ermine body, every generation Canine distemper virus can be observed by Electronic Speculum in (lymph node, brain, lungs, spleen, liver) in mink internal organs grinding supernatant Particle, internal organs grind supernatant and are inoculated with Vero cells, and 48 amalgamation cytopathy as a child occurred, illustrated QN-1 plants of CDV in water It is replicated in ermine body.The state of mind, appetite are normal in 1~5 generation mink inoculation 10d, and inoculation mink body temperature is normal (table 8).It sees It examines inoculation mink in the phase and does not occur doubtful canine distemper symptom (table 9).

Table 8 is inoculated with the clinical symptoms change of mink

9 CDV QN-1 strain the 5th generation basis seeds culture of viruses of table are inoculated with mink 1~5 generation temperature data

After QN-1 plants of CDV continuously passed for 5 generations in mink body, influences virulence and connect glycosylation with 7 N- of immunogenicity Site (19~21,19~151,391~393,422~424,456~458,587~589 and 603~605) and 11 half Guangs Amide residues do not make a variation.Illustrating QN-1 plants of CDV, to return strong gene prominent for avirulence during continuous passage in mink body Become and generate, gene genetic stability is high.

4) the CDV QN-1 plants of cohabitation infections to mink are tested

CDV QN-1 strain the 5th generation basis seeds culture of viruses are inoculated with mink 5,10ml/ only, while will not be inoculated with the strong of any vaccine Health mink 3 raised 21 with cage, observes body temperature, excrement, state of mind foot pad character and the death of the mink that lives together daily Situation, while test group and control group mink are taken a blood sample respectively, measure serum neutralizing antibody.As a result, the state of mind for the mink that lives together, Appetite, body temperature, excrement are normal, do not occur the clinical symptoms (being shown in Table 10, table 11) of doubtful canine distemper, the mink that lives together does not occur blood Clear neutralizing antibody is positive (being shown in Table 12).Show QN-1 plants of CDV to target animals safety, the mink of vaccine inoculation to raising jointly The susceptible mink of health has no adverse reaction, and will not cause the clinical infection of canine distemper.

The clinical symptoms change of 10 mink cohabitation infection of table experiment

QN-1 plants of 11 CDV of table inoculation minks live together and live together mink 21d temperature datas

12 mink cohabitation infection 21d serum neutralizing antibodies of table change

Embodiment 3：(QN-1 plants) of mink canine distemper live vaccine is prepared and is examined

Vero cells：Culture and detection for mink canine distemper virus.

The weak poison CDV QN-1 low virulent strains of mink canine distemper virus,

Main agents：Newborn bovine serum is provided by specified producer, and product reaches producer's quality standard.MEM is by Gibco public affairs Department provides, and reaches prescribed requirement；Trypsase is provided by specified producer；Sodium chloride, disodium hydrogen phosphate etc. are that analysis is pure, by referring to Producer's offer is provided.

Susceptible mink (mink canine distemper serum neutralizing antibody≤1 of health of 45~60 age in days of experimental animal:4), by Qingdao Agriculture university's Animal Science And Technology experiment centre provides.

1) cell growth medium and cell maintenance medium are prepared

MEM powder is made into 10 times of mother liquors with water for injection, 0.22um filter membranes are sterile filtered to keeping spare in sterile chamber (being no more than 15 days)；MEM mother liquors are diluted into as MEM working solutions for 10 times with sterilized water for injection；MEM working solution 950ml are added Mycillin 100U/ml is added in newborn bovine serum 50ml, is 7.0~7.2 with sodium bicarbonate adjustment pH, as 5% cell growth Newborn bovine serum is changed to 20ml, as 2% cell maintenance medium by liquid.

2) positive serum and antibody canine distemper and Mink Parvovirus positive serum are made by oneself by this laboratory, and anti-dog is tiny Virus, canine distemper virus, hepatitis infectiosa canis virus, hydrophobin, the fluorescence antibody of bovine viral diarrhea virus, antithymocyte serum Purchased from China Veterinery Drug Inspection Office.

3) preparation of mink canine distemper live vaccine (QN-1 plants) production seed culture of viruses is gone bail for the QN-1 plants of seeds culture of viruses of CDV deposited, and 1:3 Poison amount is connect by the 3% of cell culture fluid to synchronize and be inoculated in Vero cells, set 33 DEG C and cultivate 7~8, when cytopathy reaches after dilution When 80%, after harvesting virus liquid freeze thawing twice, passed for 2 generations again by preceding method, quantitative separating indicates harvest date, passage generation Secondary, -20 DEG C of preservations are used as production seed culture of viruses.

4) inspection of production seed culture of viruses takes each batch to produce each 2 of seed culture of viruses, by existing《Chinese veterinary pharmacopoeia》Method carry out virus Content and pure property are examined.Seed culture of viruses inspection result complies with standard, and can be used as production seed culture of viruses and uses.

5) production is done 10 times with seed culture of viruses and is serially diluted by viral level measurement, chooses 10^-3、10^-4、10^-5、10^-6、10^-7 5 A dilution, inoculation grow up on 96 orifice plates of Vero cell monolayers, and each dilution is inoculated with 6 holes, and per 100 μ l of hole, absorption 1 is small When, add maintaining liquid (MEM for containing 2% newborn bovine serum) 100 μ l, cultivates 7~8 in the incubator containing 5% carbon dioxide at 33 DEG C Day, the hole count for CPE occur is observed and recorded day by day, and TCID is calculated by Reed-Muench methods₅₀.As a result, seed culture of viruses viral level is not Less than 10^5.0 TCID₅₀/ml。

6) steriling test takes production seed culture of viruses by existing by existing《Chinese veterinary pharmacopoeia》Annex is tested, as a result sterile Growth.

7) mycoplasma inspection takes production seed culture of viruses by existing by existing《Chinese veterinary pharmacopoeia》Annex is tested, as a result without Mycoplasma is grown.

8) exogenous virus inspection takes production seed culture of viruses by existing by existing《Chinese veterinary pharmacopoeia》Annex is tested, as a result No exogenous virus pollution.

9) QN-1 plants of seeds culture of viruses of CDV are diluted to 200TCID by specific assay with cell maintenance medium₅₀/ 0.1ml, with hundstaupe Hot specific positive serum mixed in equal amounts, in 37 DEG C of water-baths and 1 hour, 24 hole cell culture of Vero cell monolayers are covered in inoculation 4 culture holes of plate supplement maintaining liquid 0.9ml, while setting virus control, normal cell controls, negative serum pair per hole 0.1ml According to each 4 hole, 33 DEG C are cultivated 7.As a result, CPE should all occur in virus control wells and negative serum control hole, positive serum neutralizes CPE should not occur in hole and normal cell controls hole.

1, the preparation of seedling venom

Inoculation prepares Vero cell suspension (concentration 5 × 10 with cell growth medium (MEM for containing 5% newborn bovine serum)⁶A/ Ml), 3% production CDV kind venom is added, sets 33 DEG C of standings or spinner culture.

2.3.2 it after observation connects poison culture with harvest, observes 1~2 time daily, records cytopathy situation, work as sick cell It is viral up to being harvested when 80% or more, and keep sample, it is stored in -20 DEG C.It is prepared for three batches of virus liquids altogether.

The inspection of seedling venom

Steriling test is separately sampled and mix as unit of group by the virus liquid of harvest, by existing《Chinese veterinary pharmacopoeia》It is attached The method of record carries out.As a result, pollution-free.

Viral level is measured the virus liquid of harvest is separately sampled as unit of group and is mixed, and is made 10 times and be serially diluted, TCID is calculated by Reed-Muench methods₅₀.As a result, three batches of canine distemper seedling venom viral level measurement results are respectively 10^5.0TCID₅₀/ml、10^5.0TCID₅₀/ ml and 10^5.25TCID₅₀/ml。

Vaccine, which matches to mix the qualified virus liquid of inspection with 10000-11000ml with packing, forms 1 batch, according to virus After content presses the dilution standard dilution of 6 part/bottles in table 13, pH to 7.4 is adjusted, adds 2 parts of stabilizers by 3 parts of viruses, is added simultaneously Enter suitable antibiotic, be fully mixed rear quantitative separating in cillin bottle, every bottle of 2ml is shown in Table 14 with seedling data.

13 different virus content semi-finished product extension rate conversion table of table

Table 14 prepares 3 batches of vaccines and matches seedling tables of data

* former seedling refers to dilution antigen liquid addition protective agent and antibiotic, adjusts the antigen liquid to be packed after pH value

※ packing process will appear partition losses, and equipment also has part original seedling loss when packing, so practical dispensed loading amount It is inconsistent with theoretical yield.

Vaccine freeze-drying and labeling

By existing after packing《Chinese veterinary pharmacopoeia》The method of annex and the freeze-drying curve of production technology optimization carry out rapidly cold Freeze vacuum drying.Three batches of freeze-dried vaccines are prepared for, lot number 201201,201202,201203 sticks production label.

2, mink canine distemper live vaccine (QN-1 plants) product inspection

Physical behavior examines every batch of vaccine to take 5 bottles, observes and records.

Steriling test every batch of vaccine takes 5 bottles, by existing《Chinese veterinary pharmacopoeia》Annex is tested.

Mycoplasma examines every batch of vaccine to take 5 bottles, by existing《Chinese veterinary pharmacopoeia》Annex is tested.

Exogenous virus examines every batch of vaccine to take 5 bottles, by existing《Chinese veterinary pharmacopoeia》Annex is tested.

Diagnostic test every batch of vaccine takes 5 bottles, and vaccine is diluted to 200 TCID₅₀/ 0.1ml adds CDV equivalent specificity blood Clearly, it observes 6 with 1 hour, inoculation Vero cells in 37 DEG C of water-baths, records result.

Safety verification selects 45~60 age in days health mink (neutralize antibody titers≤1 CDV:4) 5,10 are subcutaneously injected The vaccine of dosage, spirit, appetite and the Temperature changing of the ermine of observation inoculation daily, is observed continuously 21.As a result, immunity inoculation Mink is all strong to live, and RT-PCR detections CDV is all negative (table 15).

3, efficacy test

Viral level measurement takes 1 bottle of vaccine sample, and 10 times of sterile saline work, which is added, by regulation head part is serially diluted. Take 10³~10⁷Dilution 5, inoculation grow up on 96 orifice plates of Vero cell monolayers, and each dilution is inoculated with 6 holes, per 100 μ of hole L, absorption add 100 μ l of maintaining liquid after 1 hour, and at 33 DEG C, culture observation 7~8 days, calculate TCID₅₀.As a result, measuring 3 batches of vaccines (201201/201202/201203) viral level is respectively 10^4.6TCID₅₀/ml、10^4.7TCID₅₀/ ml and 10^4.34TCID₅₀/ ml。

Animal protest test every batch of vaccine takes 1 bottle at random.Water for injection is added by regulation head part, is subcutaneously injected 45 Susceptible ermine (neutralizing antibody≤1 CDV of~60 ages in days health:4) 5, every 1ml (1 part) presses identical dose of identical approach after 21 days Amount carries out 1 time and is immunized.It is another that the identical mink of condition 3 is taken only to compare.100ID is used after immune within 21st₅₀GN plants of strong poison CDV it is subcutaneous Each immune ermine and control ermine are attacked in injection.Observation 21 days.As a result, protective rate is 100% after the immune ermine of vaccine inoculation attacks poison, exempt from Epidemic disease mink all survives, and control group mink is attacked after poison all dead (table 17).

Residual moisture measures every batch of vaccine and takes 5 bottles, by existing《Chinese veterinary pharmacopoeia》Annex is tested.

Vacuum degree measures every batch of vaccine and takes 5 bottles, by existing《Chinese veterinary pharmacopoeia》Annex is tested.

As a result, three batches of vaccines of production, lot number 201201,201202,201203.Through examining, vaccine is in physical behavior, pure Essence, specificity, safety (the results are shown in Table 15), effect (the results are shown in Table 16) are qualified；Mink canine distemper virus potency is distinguished It is 10^4.6TCID₅₀/ml、10^4.7TCID₅₀/ ml and 10^4.34TCID₅₀/ml。

15 mink canine distemper live vaccine of table (QN-1 plants) product inspection result

16 vaccine safety inspection result of table

Note："-" is indicated without the symptom:a:>=40 DEG C of fever, continues 1~3；b:Spiritual depressed, anorexia or it is useless absolutely, Two there is gum, conjunctivitis, thin nasal discharge or purulence nose liquid；c:Arrange blood sample loose stools or with egg white sample excrement；d:Foot pad increases There is keratinization in thickness；e:RT-PCR testing results

17 protest test result of table

Note：a:>=40 DEG C of fever；b：Spiritual depressed, anorexia or it is useless absolutely, two gum, conjunctivitis, nose stream occur clear Tears or purulence nose liquid；c：Abnormal defecation (blood sample or egg white sample)；d：Foot pad keratinization；e:The state of mind is poor；“-”：Without the symptom； “√”：There is the symptom.

Embodiment 4：Minimum immune dosage is tested

1 material

Susceptible mink (mink canine distemper serum neutralizing antibody≤1 of health of 1.1 experimental animal, 40~50 age in days:4), by blueness Island agriculture university Animal Science And Technology experiment centre provides.

1.2 viruses attack GN plants of poison velogen strain CDV (internal organs poison, ID₅₀≤10^-2/ ml), cultivated by Qingdao Agricultural University, It identifies and takes care of.

2 minimum immune dosages are tested

2.1 immune groupings dilute the mink canine distemper live vaccine (QN-1) that lot number is 201201 with sterilized water for injection It is 10^3.0TCID₅₀/ml、10^3.5TCID₅₀/ml、10^4.0TCID₅₀/ml、10^4.5TCID₅₀/ ml totally 4 gradients, it is inoculated with 45 respectively~ 10 1ml of mink of 60 ages in days.Separately set control group 4 (45~60 age in days), injecting normal saline 1ml.

After 2.2 protest test 21d 1 immune, progress in the 21st day after being immunized is carried out by the identical approach of same dose again Attack poison, 100 ID of mink canine distemper group₅₀(GN plant) attacks of strong poison, isolated rearing observes 21 days, and observation and is faced excrement toxin expelling Bed performance, calculates protective rate.As a result, the healthy ermine of 45~60 ages in days is inoculated with mink canine distemper live vaccine various dose respectively, All do not occur adverse reaction before attacking poison, the 21st after inoculation day is respectively with 100 ID₅₀It is strong poison (GN plant) attack.Mink hundstaupe Hot group with 10^3.5TCID₅₀When/head part is inoculated with mink canine distemper live vaccine, it has been resistant to the attack of the strong poison of mink hundstaupe heat toxin, and 10^3.0TCID₅₀The experimental animal of/head part inoculation mink canine distemper live vaccine is attacked after poison, different degrees of degree morbidity occurs, Control group all morbidities (table 18).By test result：Mink canine distemper live vaccine be immunized ermine minimum immune dosage be 10^3.5TCID₅₀/ head part.

18 mink canine distemper live vaccine minimum immune dosage measurement result of table (mink canine distemper virus CDV GN attack malicious group)

Canine distemper clinical onset criterion (1) is generated heat (body temperature is up to 40 DEG C or more), continues 1~3；(2) spirit it is depressed, Anorexia or it is useless absolutely, two there is gum, conjunctivitis, thin nasal discharge or purulence nose liquid；(3) blood sample loose stools is arranged or with egg white The excrement of sample mucus；(4) foot pad thickens, and keratinization occurs；(5) RT-PCR detects excrement or dead animal spleen or lungs in sun Property.Have any one of (5) item and (1), (2), (3), (4), is judged to infection morbidity.

Sequence table

<110>Qingdao Agricultural University

<120>A kind of Strain 3 of Canine Distemper and its application

<160> 2

<170> SIPOSequenceListing 1.0

<210> 1

<211> 1824

<212> DNA

<213> 2 Ambystoma laterale x Ambystoma jeffersonianum

<400> 1

atgctctcct accaagacaa ggtgggtccc ttctacaagg acaatgcaag acccaattca 60

tccaagctgt ccccagtgac agaacagcat gggggcagga gaccacctta tttgttgttt 120

gtccttctca tcctattggt tggaatcctg gccctgcttg ctatcactgg agttcgattt 180

caccaagtat caactagcaa tatggaattt agcagattgc tgaaagagga tatggagaaa 240

tcagaggccg tacatcatca agtcatagat gtcttgacac cgctcttcaa gattattggg 300

gatgagattg ggttacggtt gccacaaaag ctaaacgaga tcaaacaatt tatccttcaa 360

aagacaaatt tcttcaatcc gaacagagaa ttcgatttcc gcgatctcca ctggtgcatt 420

aacccgccta gtaaggtcaa ggtgaatttt acaaattact gtgagacaat tgggatcaga 480

aaatctattg catcggcagc aaatcccatc cttttatcag ccctctctgg gggcaggagt 540

gacatattcc caccatacag atgcagtgga gctactactt cagtaggcaa agttttcccc 600

ctatcagtct cgttatccat gtctttgatc tcaagaacct cacagataat caatatgctg 660

accgctacct cagacggcgt gtatggcaaa acttacttgc tagtgcctga tgatatagaa 720

cgggagttcg acactcaaga gattcgagtc tttgaaatag gcttcattaa aaggtggctg 780

aatgacatgc cattactcca agcaaccaac tatatggtcc tcccggagaa ttccaaagcc 840

aaggtatgta ccatagcagt gggtgagttg acactggctt cctcgtgtgt agaagagagc 900

actgtattat tataccatga cagcaggggt tcacaagatg gtattctagt agtgacactg 960

gggatatttg gggcaacacc tatggatcat attgaggaag tgatacctgt cgctcaccca 1020

tcaatggaga aaatacatat aacaaaccac cgtggtttta taaaagattc aattgcaacc 1080

tggatggtgc ctgccctggc ctctgagaaa caagaagaac aaaaaggttg gctggagtca 1140

gcttgtcaaa gaaaaaccta ccccatgtgc aaccaaacgt catgggaacc cttcggagga 1200

ggacagttgc catcttatgg gcggttgaca ttacctctag atgcaagtgt tgaccttcaa 1260

cttaacatat cgttcacata cggtccggtt atactgaatg gagatgctat ggattattat 1320

caaagcccac ttttgaactc cggatggctt accattcctc ctaaaaacgc aacaatcctt 1380

ggattgataa acaaagcaag tagaggagac cagttcactg tgatacccca agtattaaca 1440

tttgcgccca gggaatcatg tggaaattgt tatttaccta ttcaaacatc tcaaattata 1500

gatagagatg tcctcatcga gtccaatgta gtggtgttgc ctacacagag ttttagatat 1560

gtcatagcaa cgtctgtcat atcacgaaat gatcatgcga ttgtttatta tgtttatcac 1620

ccaatccgga ccatttctta tacgcaccca tttagactaa ctaccaaggg tagacctgat 1680

ttcctaagga ttgaatgttt tgtgtgggat gataatttgt ggtgtcacca attttacaga 1740

tacgagccta acatcgccaa ctctacaacc agtgttgaga atttagtccg tataagattc 1800

tcatgtaacc gttcaaatcc ctga 1824

<210> 2

<211> 607

<212> PRT

<213> 2 Ambystoma laterale x Ambystoma jeffersonianum

<400> 2

Met Leu Ser Tyr Gln Asp Lys Val Gly Pro Phe Tyr Lys Asp Asn Ala

1 5 10 15

Arg Pro Asn Ser Ser Lys Leu Ser Pro Val Thr Glu Gln His Gly Gly

20 25 30

Arg Arg Pro Pro Tyr Leu Leu Phe Val Leu Leu Ile Leu Leu Val Gly

35 40 45

Ile Leu Ala Leu Leu Ala Ile Thr Gly Val Arg Phe His Gln Val Ser

50 55 60

Thr Ser Asn Met Glu Phe Ser Arg Leu Leu Lys Glu Asp Met Glu Lys

65 70 75 80

Ser Glu Ala Val His His Gln Val Ile Asp Val Leu Thr Pro Leu Phe

85 90 95

Lys Ile Ile Gly Asp Glu Ile Gly Leu Arg Leu Pro Gln Lys Leu Asn

100 105 110

Glu Ile Lys Gln Phe Ile Leu Gln Lys Thr Asn Phe Phe Asn Pro Asn

115 120 125

Arg Glu Phe Asp Phe Arg Asp Leu His Trp Cys Ile Asn Pro Pro Ser

130 135 140

Lys Val Lys Val Asn Phe Thr Asn Tyr Cys Glu Thr Ile Gly Ile Arg

145 150 155 160

Lys Ser Ile Ala Ser Ala Ala Asn Pro Ile Leu Leu Ser Ala Leu Ser

165 170 175

Gly Gly Arg Ser Asp Ile Phe Pro Pro Tyr Arg Cys Ser Gly Ala Thr

180 185 190

Thr Ser Val Gly Lys Val Phe Pro Leu Ser Val Ser Leu Ser Met Ser

195 200 205

Leu Ile Ser Arg Thr Ser Gln Ile Ile Asn Met Leu Thr Ala Thr Ser

210 215 220

Asp Gly Val Tyr Gly Lys Thr Tyr Leu Leu Val Pro Asp Asp Ile Glu

225 230 235 240

Arg Glu Phe Asp Thr Gln Glu Ile Arg Val Phe Glu Ile Gly Phe Ile

245 250 255

Lys Arg Trp Leu Asn Asp Met Pro Leu Leu Gln Ala Thr Asn Tyr Met

260 265 270

Val Leu Pro Glu Asn Ser Lys Ala Lys Val Cys Thr Ile Ala Val Gly

275 280 285

Glu Leu Thr Leu Ala Ser Ser Cys Val Glu Glu Ser Thr Val Leu Leu

290 295 300

Tyr His Asp Ser Arg Gly Ser Gln Asp Gly Ile Leu Val Val Thr Leu

305 310 315 320

Gly Ile Phe Gly Ala Thr Pro Met Asp His Ile Glu Glu Val Ile Pro

325 330 335

Val Ala His Pro Ser Met Glu Lys Ile His Ile Thr Asn His Arg Gly

340 345 350

Phe Ile Lys Asp Ser Ile Ala Thr Trp Met Val Pro Ala Leu Ala Ser

355 360 365

Glu Lys Gln Glu Glu Gln Lys Gly Trp Leu Glu Ser Ala Cys Gln Arg

370 375 380

Lys Thr Tyr Pro Met Cys Asn Gln Thr Ser Trp Glu Pro Phe Gly Gly

385 390 395 400

Gly Gln Leu Pro Ser Tyr Gly Arg Leu Thr Leu Pro Leu Asp Ala Ser

405 410 415

Val Asp Leu Gln Leu Asn Ile Ser Phe Thr Tyr Gly Pro Val Ile Leu

420 425 430

Asn Gly Asp Ala Met Asp Tyr Tyr Gln Ser Pro Leu Leu Asn Ser Gly

435 440 445

Trp Leu Thr Ile Pro Pro Lys Asn Ala Thr Ile Leu Gly Leu Ile Asn

450 455 460

Lys Ala Ser Arg Gly Asp Gln Phe Thr Val Ile Pro Gln Val Leu Thr

465 470 475 480

Phe Ala Pro Arg Glu Ser Cys Gly Asn Cys Tyr Leu Pro Ile Gln Thr

485 490 495

Ser Gln Ile Ile Asp Arg Asp Val Leu Ile Glu Ser Asn Val Val Val

500 505 510

Leu Pro Thr Gln Ser Phe Arg Tyr Val Ile Ala Thr Ser Val Ile Ser

515 520 525

Arg Asn Asp His Ala Ile Val Tyr Tyr Val Tyr His Pro Ile Arg Thr

530 535 540

Ile Ser Tyr Thr His Pro Phe Arg Leu Thr Thr Lys Gly Arg Pro Asp

545 550 555 560

Phe Leu Arg Ile Glu Cys Phe Val Trp Asp Asp Asn Leu Trp Cys His

565 570 575

Gln Phe Tyr Arg Tyr Glu Pro Asn Ile Ala Asn Ser Thr Thr Ser Val

580 585 590

Glu Asn Leu Val Arg Ile Arg Phe Ser Cys Asn Arg Ser Asn Pro

595 600 605

Claims (5)

1. a kind of canine distemper virus strain, deposit number is CCTCC NO:V201814.

2. Strain as described in claim 1, viral seed culture of viruses content >=105.0TCID50/ml.

3. application of the Strain described in claim 1 in preparing vaccine.

4. application as claimed in claim 3, which is characterized in that the vaccine is freeze dried vaccine.

5. a kind of freeze dried vaccine, which is characterized in that the vaccine uses Strain described in claim 1 as antigen.