We surveyed prevalence and contamination levels of Listeria monocytogenes in ready-to-eat foods between 2000 and 2012 in Tokyo. L. monocytogenes was isolated from 52 (1.7%) out of 2,980 samples. Comparing the prevalence in the study period, 2.2% were positive in the former period (2000-2005) and 1.2% in the latter (2006-2012). Using the most probable number (MPN) technique, 32 samples were contaminated with fewer than 0.3 L. monocytogenes/g, 10 samples with 0.3-1.0/g and 4 samples with more than 1.0/g (the maximum was 2.3/g). The most common serovar was 1/2a, followed by 1/2b, 4b and 1/2c. We revealed that ready-to-eat foods in Tokyo were contaminated with L. monocytogenes, although the contamination levels were low.
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Shimojima, Y., Ida, M., Nakama, A., Nishino, Y., Fukui, R., Kuroda, S., … Sadamasu, K. (2016). Prevalence and contamination levels of Listeria monocytogenes in ready-to-eat foods in Tokyo, Japan. Journal of Veterinary Medical Science. Japanese Society of Veterinary Science. https://doi.org/10.1292/jvms.15-0708