JP6132852B2 - サルモネラ微生物の検出方法 - Google Patents
サルモネラ微生物の検出方法 Download PDFInfo
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- JP6132852B2 JP6132852B2 JP2014550349A JP2014550349A JP6132852B2 JP 6132852 B2 JP6132852 B2 JP 6132852B2 JP 2014550349 A JP2014550349 A JP 2014550349A JP 2014550349 A JP2014550349 A JP 2014550349A JP 6132852 B2 JP6132852 B2 JP 6132852B2
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Description
[001]本出願は、2011年12月28日に出願された米国特許仮出願第61/580,849号の利益を主張し、その全体を参照として本明細書に組み込む。
[002]腸内細菌科は、糖(例えば、グルコース)を発酵させて乳酸及び/又は他の酸性最終生成物にする能力を有する代謝的に多様な、通性嫌気性微生物(bacteria)を数多く含む。この科は、大腸菌、サルモネラ属のいくつかの亜種、エルシニア菌、クレブシエラ属のいくつかの種、及びシゲラ属のいくつかの種のような、いくつかの周知のヒト病原体を含む。
[006]概して、本開示は、試験試料中のサルモネラ微生物の有無を検出するための組成物及び方法に関する。具体的には、組成物は、サルモネラ微生物の増殖を促進するものであり、グラム陽性微生物の増殖を阻害する少なくとも1つの選択剤を含んでいる。更に、組成物は、少なくとも2つの識別指示システムを含む。識別指示システムの少なくとも1つは、非サルモネラ微生物からサルモネラ微生物を陽性に識別し、識別指示システムの少なくとも1つは、非サルモネラ微生物からサルモネラ微生物を陰性に識別する。
[0027]サルモネラ属には、2つの種、サルモネラエンテリカ及びサルモネラボンゴリが含まれる。2つの種の遺伝的関係は、Fookesらによって研究されている(参照により本明細書にその全体が援用される「Salmonella bongori Provides Insights into the Evolution of the Salmonellae」、PLOs Pathogens at www.plospathogens.org,2011,vol.7、記事番号e1002191、p 1〜16)。S.エンテリカの亜種は、人に病気を感染させる及び病気を引き起こす能力のために、S.ボンゴリよりもよく知られているが、S.ボンゴリもまた人の感染を引き起こすことが示されている。したがって、潜在的な病原性を有するサルモネラ微生物を検出するように設計されたテストは、両方の種を検出する能力を有する必要がある。
[0083]実施形態1は
ゲル化剤と、
グラム陽性微生物の増殖を阻害する少なくとも1つの第1の選択剤と、
少なくとも1つの第1の識別指示化合物を含む第1の識別指示システムと、
ウレアーゼ酵素活性により第2の検出可能な生成物に変換される第2の識別指示化合物を含む第2の識別指示システムと、を含む、半固体の培養培地を含み、
第1の識別指示化合物は、サルモネラ属に属する複数のメンバーにより第1の検出可能な生成物に変換され得るものであり、
第1の識別指示化合物は、上記培養培地の中及び/又は上に検出可能なコロニーを形成する複数の非サルモネラ属のグラム陰性腸内微生物によって変換され得ないものである、組成物である。
ゲル化剤と、
複数のグラム陰性腸内微生物の増殖を促進する栄養素と、
グラム陽性微生物の増殖を阻害する少なくとも1つの第1の選択剤と、
少なくとも1つの第1の識別指示化合物を含む第1の識別指示システムと、
ウレアーゼ酵素活性により第2の検出可能な生成物に変換される第2の識別指示化合物を含む第2の識別指示システムと、を含む半固体の培養培地からなり、
第1の識別指示化合物は、サルモネラ属に属する複数のメンバーにより第1の検出可能な生成物に変換され得るものであり、
第1の識別指示化合物は、培養培地の中及び/又は上に検出可能なコロニーを形成する複数の非サルモネラ属のグラム陰性腸内微生物によって変換され得ないものである、組成物である。
ゲル化剤と、
サルモネラ微生物の増殖を促進する栄養素と、
グラム陽性微生物の増殖を阻害する少なくとも1つの第1の選択剤と、
少なくとも1つの第1の識別指示化合物を含む第1の識別指示システムと、
ウレアーゼ酵素活性により第2の検出可能な生成物に変換される第2の識別指示化合物を含む第2の識別指示システムと、を含む半固体の培養培地を含み、
第1の識別指示化合物は、サルモネラ属に属する複数のメンバーにより第1の検出可能な生成物に変換され得るものであり、
第1の識別指示化合物は、培養培地の中及び/又は上に検出可能なコロニーを形成する複数の非サルモネラ属のグラム陰性腸内微生物によって変換され得ないものである、組成物である。
ゲル化剤と、
サルモネラ微生物の増殖を促進する栄養素と、
グラム陽性微生物の増殖を阻害する少なくとも1つの第1の選択剤と、
少なくとも1つの第1の識別指示化合物を含む第1の識別指示システムと、
ウレアーゼ酵素活性により第2の検出可能な生成物に変換される第2の識別指示化合物を含む第2の識別指示システムと、
β−ガラクトシダーゼ酵素活性により第3の検出可能な生成物に変換される第3の識別指示化合物を含む第3の識別指示システムと、を含む半固体の培養培地を含み、
第1の識別指示化合物は、サルモネラ属に属する複数のメンバーにより第1の検出可能な生成物に変換され得るものであり、
第1の識別指示化合物は、培養培地の中及び/又は上に検出可能なコロニーを形成する複数の非サルモネラ属のグラム陰性腸内微生物によって変換され得ないものである、組成物である。
試験試料、培養装置、及び実施形態1〜17のいずれか1つの組成物を提供することと、
播種した培養装置を形成するために培養装置内で組成物と試験試料を接触させることと、
第1の時間、播種された培養装置をインキュベートすることと、
培養装置を観察して、第1の検出可能な生成物を検出することと、を含み、第1の検出可能な生成物がサルモネラ微生物の存在の第1の指示である、サルモネラ微生物の検出方法である。
サルモネラ微生物によって第4の検出可能な生成物に代謝され得る確定指示化合物を有する物品を提供することと、
物品を培養培地に接触させることと、
装置を第2の時間インキュベートすることと、
培養装置を観察して、第4の検出可能な生成物を検出することと、を更に含み、
第4の検出可能な生成物が、存在する場合には、第1の検出可能な生成物、第2の検出可能な生成物、及び、第3の検出可能な生成物から区別され得るものであり、第1の検出可能な生成物と並べて第4の検出可能な生成物を検出することが、試料中のサルモネラ微生物の存在の第2の指示である、実施形態18〜23のいずれか1つの方法である。
[00118]薄膜培養装置は、参照によりその全体が本明細書に援用される、2011年5月20日出願された米国特許出願第61/488,492号(代理人整理番号第67673US002号)に記載の手順に従って調整した。粉末コーティングされた紙の基質を調整するために使用される粉末組成物は、2−デオキシ−D−リボース(2DDR、Research Products International Corp.、Mt.Prospect,IL)2重量部とグアーガム(M150 guar MEYPROGAT gum,Meyhall Chemical AG)98重量部とを混合して作製した。粉末コーティングする前に、紙を、TTC含有接着剤でコーティングした。
[00124]表2に列挙された微生物株の純粋培養物をそれぞれ緩衝ペプトン水に播種し(Merck(Darmstadt,Germany))、37℃で一晩インキュベートした。得られた微生物懸濁液はそれぞれ、約1×109コロニー形成単位(cfu/mL)の濃度を有していた。
[00128]検出物品(ディスク)は、参照により本明細書にその全体が援用されるPCT国際特許第2012/092181号の実施例1に記載のように調製した。
Claims (2)
- (1)ゲル化剤と、
グラム陽性微生物の増殖を阻害する少なくとも1つの第1の選択剤と、
少なくとも1つの第1の識別指示化合物及びpH指示薬を含む第1の識別指示システムと、
ウレアーゼ酵素活性により第2の検出可能な生成物に変換される第2の識別指示化合物を含む第2の識別指示システムと、
β−ガラクトシダーゼ酵素活性により第3の検出可能な生成物に変換される第3の識別指示化合物を含む第3の識別指示システムと、
を含む、半固体の培養培地を含む組成物であって、
前記第1の識別指示化合物は、サルモネラ微生物によって第1の検出可能な生成物に変換され得る発酵性炭水化物であり、前記第1の検出可能な生成物は酸性化合物及び/又は気体を含み、
前記第1の識別指示化合物は、前記培養培地の中及び/又は上に検出可能なコロニーを形成する複数の非サルモネラ属のグラム陰性腸内微生物によって変換され得ないものである、組成物、
(2)試験試料、及び
(3)培養装置
を準備することと、
前記培養装置内で前記組成物と前記試験試料を接触させることにより、播種された培養装置を形成することと、
第1の時間、前記播種された培養装置を41℃〜44℃の温度でインキュベートすることと、
前記第1の検出可能な生成物、前記第2の検出可能な生成物及び前記第3の検出可能な生成物を検出するために、前記インキュベート後の培養装置を観察することと、を含み、
前記第1の検出可能な生成物が検出され、かつ、前記第2の検出可能な生成物及び前記第3の検出可能な生成物が検出されないことが、前記試験試料中のサルモネラ微生物の存在の第1の指示である、サルモネラ微生物の検出方法。 - サルモネラ微生物によって第4の検出可能な生成物に代謝され得る確定指示化合物を有する物品を提供することと、
前記物品を前記インキュベート後の培養装置における前記培養培地に接触させることと、
前記物品を接触させた培養培地を含む培養装置を第2の時間インキュベートすることと、
前記第2の時間のインキュベート後の培養装置を観察して、前記第4の検出可能な生成物を検出することと、を更に含み、
前記第4の検出可能な生成物が、前記第1の検出可能な生成物、前記第2の検出可能な生成物、及び、前記第3の検出可能な生成物から区別され得るものであり、
前記第1の検出可能な生成物と共に前記第4の検出可能な生成物が検出されることが、前記試験試料中のサルモネラ微生物の存在の第2の指示である、請求項1に記載の方法。
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