The Thai Journal of Veterinary Medicine


This study was conducted from 2004 to 2009 to investigate the prevalence of Listeria monocytogenes in thechicken production chain in Thailand from primary production stages to processing plants. A total of 14,670 sampleswere taken from 43 breeder farms, 32 hatcheries, 1331 broiler farms, 22 slaughterhouses and 22 ready-to-eat (RTE)chicken products from processing plants. Various types of samples were collected: soiled litter, water, and chickenfeed from breeder and broiler farms; swabs and mecomium from hatcheries; cloacal swabs and fresh frozen chickenmeat from slaughterhouses; and RTE chicken products from processing plants. This study showed that there was noL. monocytogenes contamination in the chicken production chain except in slaughterhouses and processing plants. Thisimplies that the chickens did not carry the organism into slaughterhouses, and consequently primary productionpractices were not responsible for the contamination of end products. This suggests that the observed L.monocytogenes contamination in 59 (2.5%) and 2 (0.2%) samples of fresh frozen chicken meat and RTE chickenproducts, respectively, was due to breakdowns in the application of good hygienic and/or good manufacturingpractices.

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