ENUMERATION OF LISTERIA SPP. PARTICULARLY LISTERIA MONOCYTOGENES CONTAMINATION IN PORK IN AND AROUND KOLKATA AND STUDY OF ITS' MORPHOLOGY THROUGH SCANNING ELECTRON MICROSCOPY

摘要

A total of 240 pork and pork swab samples were tested to enumerate Listeria spp. contamination in them. Among those samples 32 (13.3%) samples were Listeria spp. positive and among these Listeria spp. positive samples 6 (18.75%) were positive for L. monocytogenes. Out of 80 samples collected from Organized Slaughter house 24 (30%) samples were Listeria spp. positive whereas among 160 samples collected from retailer, only eight (5%) samples were positive to listeria spp. Among 40 pork and 40 pork swab samples from Organized Slaughter house one pork and three pork swab samples were positive for L. monocytogenes. Among pork samples three, one, two and three were positive for L. ivanovii, L. innocua, L. seeligeri and L. grayi respectively. Similarly among pork swab samples three, two, two and four samples showed presence of L. ivanovii, L. innocua, L. seeligeri and L. grayi. respectively. Among 80 pork and 80 pork swab samples collected from retail shops one pork and one pork swab sample had the presence of L. monocytogenes. Among 80 pork samples one sample was positive for L. innocua and one for L. seeligeri. Among 80 pork swab samples one was positive for L. innocua, one for I. welshimeri and two for L. seeligeri. The findings revealed that the pork of organized slaughter house is much more contaminated with Listeria spp.