examination of food chain-derived listeria monocytogenes strains of different serotypes reveals considerable diversity in inla genotypes, mutability, and adaptation to cold temperatures.listeria monocytogenes strains belonging to serotypes 1/2a and 4b are frequently linked to listeriosis. while inla mutations leading to premature stop codons (pmscs) and attenuated virulence are common in 1/2a, they are rare in serotype 4b. we observed pmscs in 35% of l. monocytogenes isolates (n = 54) recovered from the british columbia food supply, including serotypes 1/2a (30%), 1/2c (100%), and 3a (100%), and a 3-codon deletion (amino acid positions 738 to 740) seen in 57% of 4b isolates fro ...201323315746
listeriosis outbreaks in british columbia, canada, caused by soft ripened cheese contaminated from environmental sources.soft ripened cheese (src) caused over 130 foodborne illnesses in british columbia (bc), canada, during two separate listeriosis outbreaks. multiple agencies investigated the events that lead to cheese contamination with listeria monocytogenes (l.m.), an environmentally ubiquitous foodborne pathogen. in both outbreaks pasteurized milk and the pasteurization process were ruled out as sources of contamination. in outbreak a, environmental transmission of l.m. likely occurred from farm animals to pe ...201525918702
occurrence and distribution of listeria species in facilities producing ready-to-eat foods in british columbia, british columbia (bc), canada, food processing facilities licensed under provincial authority are not required to sample for listeria monocytogenes in food products or processing environments. in 2009, we conducted a survey of dairy, fish, and meat facilities under bc authority to estimate the prevalence of listeria spp. and l. monocytogenes in ready-to-eat (rte) foods and production environments. from august to october, 250 rte food samples and 258 swabs from the food processing environments ...201222289580
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