Determination of infection rate and chemical, biological characteristics of some bacteria cause poisoning in fresh pork at markets in the Northern provinces, Viet Nam

Abstract

358 pork samples were collected from the markets in Thai Nguyen, Bac Giang, Ha Dong and Vinh Phuc, Viet Nam, from 2012 to 2015 for determining the infection rate and virulence of the isolated Listeria spp., Salmonella spp. and Staphylococcus aureus. The tested result showed that the infection rate of the pork samples with Listeria spp. accounted for 13.13%, of which 65.96% of the infected samples did not meet the veterinary hygiene standard. The infection rate of the pork samples with Salmonella spp. accounted for 11.45% (did not meet the veterinary hygiene standard). There were 34.21% to 47.19% of the pork samples infected with S. aureus (did not meet the veterinary hygiene standard).There were 47 strains of Listeria spp., 41 strains of Salmonella spp., and 275 strains of Staphylococcus aureus isolated from the pork samples, they presented high virulence when testing on the experimental mice.