近日，來自英屬哥倫比亞大學的研究人員在溫哥華地下通道所賣的魚制品中發(fā)現(xiàn)了利斯塔氏菌屬（listeria）的細菌的行蹤,，研究人員Kevin Allen檢測了40個樣品,，并從7個大型連鎖超市,、10個零售商那里買來了煙熏魚（smoked tuna）、加糖的鮭魚（candied salmon）以及魚肉干（fish jerke）,，用這些來進行他們的研究,。
研究人員的這項研究成果刊登在了近日的雜志Food Microbiology上，文章中研究者表示,，在這些速食魚肉制品中,，至少含有20%的listeria菌，而且至少有5%都是有致病性的,。研究者表示,，盡管listeria菌的標準達到了規(guī)定，但是在儲存或者處理的過程中,，這些細菌可以進行繁殖,，Allen表示，在處理這些速食食品的時候,，比如切割,、稱重、包裝等,，有可能會增加細菌交叉污染的概率,，高溫可以殺死listeria菌，但是很多人在食用魚肉速食之前并不會加工一下,。Allen還補充到,，尤其是對孕婦,、老年人以及免疫力低下的病人來說，食用這種含有l(wèi)isteria菌的速食品增加了他們的健康風險,。
研究者同時又檢測了在溫哥華地下通道所買的速食肉類,，他們沒有在速食肉食品（包括紅腸、咸牛肉等）中發(fā)現(xiàn)listeria菌,，如果每千克速食品中超過100個listeruia菌體,，這就違反了食品安全規(guī)定，如果人們食用了不合規(guī)定的食品不僅僅會引起嘔吐,，甚至痢疾,，利斯特菌病的感染也會導致大腦和血液的感染，甚至引起死亡,。
（生物谷：T.Shen編譯）
doi:10.1016/j.fm.2011.12.015
PMC:
PMID:
Occurrence and characterization of Listeria spp. in ready-to-eat retail foods from Vancouver, British Columbia
Jovana Kovačević, Lili R. Mesak, Kevin J. Allen,
The occurrence of Listeria spp. and Listeria monocytogenes in retail RTE meat and fish products in Vancouver, British Columbia (B.C.) was investigated. To assess potential consumer health risk, recovered L. monocytogenes isolates were subjected to genotypic and phenotypic characterization. Conventional methods were used to recover Listeria spp. from deli meat (n = 40) and fish (n = 40) samples collected from 17 stores. Listeria spp. were recovered only from fish samples (20%); 5% harboured Listeria innocua, 5% had L. monocytogenes and 10% contained Listeria welshimeri. L. monocytogenes isolates serotyped as 1/2a and 1/2b, possessed dissimilar PFGE patterns, and had full-length InlA. Three 1/2a clonal isolates encoded the 50 kb genomic island, LGI1. Antimicrobial resistance (AMR) profiling showed all Listeria spp. possessed resistance to cefoxitin and nalidixic acid. L. monocytogenes were resistant to clindamycin, two were resistant to streptomycin, and one to amikacin. Reduced susceptibility to ciprofloxacin was seen in all L. monocytogenes, L. innocua and three L. welshimeri isolates. Reduced susceptibility to amikacin and chloramphenicol was also observed in one L. monocytogenes and three L. welshimeri isolates, respectively. Recovery of L. monocytogenes in fish samples possessing AMR, full-length InlA, LGI1, and serotypes frequently associated with listeriosis suggest B.C. consumers are exposed to high-risk strains.
