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Prevalence, characterization, and genetic diversity of Listeria monocytogenes isolated from foods of animal origin in North East India

Shakuntala, Ingudam, Das, Samir, Ghatak, Sandeep, Milton, Arockiasamy Arun Prince, Sanjukta, Rajkumari, Puro, Kekungu-U, Pegu, Raj Kumar, Duarah, Aparajita, Barbuddhe, Sukhadeo Balirao, Sen, Arnab
Food biotechnology 2019 v.33 no.3 pp. 237-250
Listeria monocytogenes, animal-based foods, beef, chicken meat, genes, genetic variation, goat meat, health hazards, milk, pork, public health, random amplified polymorphic DNA technique, serotypes, virulence, India
Listeria monocytogenes is a pathogenic microorganism infects man mostly through food. A total of 1615 samples of foods of animal origin and water were collected from retail meat shops of North-Eastern India and processed. Sixty-three (3.9%) samples were positive for L. monocytogenes. Animal origin foods showing the highest prevalence was chevon (9.8%) followed by beef (8.9%), chicken (8.5%), pork (2.8%) and milk (1.8%). The prevalence rate in water from retail meat shops was 10%. Recovered L. monocytogenes were distributed into 3 serogroups, of which 74.6% fit in to 1/2a, 3a serogroup, 17.5% to 1/2b, 3b and 7.9 % to 4b, 4d, 4e serogroups. Thirty-five isolates out of 63 possessed all the tested four virulence genes. RAPD- and ERIC -PCR based analyses jointly revealed a discriminative genetic profile for the L. monocytogenes. On the whole, the occurrence of L. monocytogenes in foods of animal origin of North Eastern India displays public health hazard.