Relatedness of Listeria monocytogenes Isolates recovered from selected ready-to-eat foods and listeriosis patients in the United States

Applied and Environmental Microbiology
Stefanie Evans GilbrethJohn B Luchansky

Abstract

Pulsed-field gel electrophoresis and serotyping were performed for 544 isolates of Listeria monocytogenes, including 502 isolates recovered from contaminated samples from 31,705 retail ready-to-eat (RTE) food products and 42 isolates recovered from human cases of listeriosis. The isolates were from Maryland (294 isolates) and California (250 isolates) and were collected in 2000 and 2001. The isolates were placed into 16 AscI pulsogroups (level of relatedness within each group, > or =66%), 139 AscI pulsotypes (levels of relatedness, > or =25% to 100%), and eight serotypes (serotypes 1/2a, 1/2b, 1/2c, 3a, 3b, 4b, 4c, and 4d). The most frequently found pulsotypes belonged to either pulsogroup A (150 food isolates plus 4 clinical isolates) or pulsogroup B (104 food isolates plus 5 clinical isolates). The majority of the 502 food isolates were either serotype 1/2a (298 isolates) or serotype 1/2b (133 isolates), whereas the majority of the 42 clinical isolates were either serotype 1/2a (19 isolates) or serotype 4b (15 isolates). Additionally, 13 clinical isolates displayed pulsotypes also found in food isolates, whereas the remaining 29 clinical isolates displayed 24 unique pulsotypes. These data indicate that most (86%) of the L. mo...Continue Reading

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Citations

Oct 14, 2008·Foodborne Pathogens and Disease·Vishal Singh PariharWilhelm Tham
Oct 14, 2008·Foodborne Pathogens and Disease·Irene B HanningSteven C Ricke
Aug 14, 2012·Foodborne Pathogens and Disease·Dimitra P HouhoulaJoseph Papaparaskevas
Aug 4, 2009·Applied and Environmental Microbiology·Youwen PanSophia Kathariou
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Apr 20, 2017·The Journal of Veterinary Medical Science·Rie HasebeMotohiro Horiuchi

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