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Subject: Veterinary Microbiology × Author: BASAIAWMOIT, ERNESTINE × Start date: 2014 × Type: Thesis × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    MOLECULAR CHARACTERISATION OF EXTENDED SPECTRUM BETA LACTAMASE (ESBL) PRODUCING Escherichia coli IN POULTRY
    (Assam Agricultural University, Khanapara, Guwahati, 2016-07) BASAIAWMOIT, ERNESTINE; Hazarika, A. K.
    The study was undertaken to isolate and identify Escherichia coli from poultry with or without the history of diarrhoea and to determine the occurrence of extended spectrum beta-lactamase (ESBL) producing Escherichia coli in Assam and Meghalaya, India. A total of 182 (67.40%) samples yielded E. coli which included 106 (67.08%) samples from Assam and 76 (67.85%) samples from Meghalaya. The samples were obtained from cloacal swabs, faecal samples and intestinal contents of diarrhoeic and non-diarrhoeic poultry birds. All the 182 strains of E. coli isolated from diarrhoeic and non-diarrhoeic birds were subjected to antibiotic susceptibility test and were phenotypically confirmed to be ESBL producers by DDST method. A total of 39 (21.42%) samples were confirmed as ESBL producers. Out of these, 19 (17.92%) samples were from Assam and 20 (26.31%) samples were from Meghalaya. Further, the extended-spectrum beta-lactamase genes viz., blaCTX-M, blaTEM, and blaSHV were detected by Polymerase Chain Reaction from the phenotypically confirmed isolates. 17 (9.34%) isolates were found to be positive for at least one of the two resistance genes, viz. blaTEM (686bp) and blaCTX-M (585bp). None of the isolates were found to contain the blaSHV gene. Of the 17 isolates, 5 (2.75%) were found to be positive for blaTEM gene, of which 3 (1.65%) were from Assam and 2 (1.09%) from Meghalaya. Similarly, 12 (6.59%) were found to be positive for blaCTX-M gene, of which 5 (2.75%) were from Assam and 7 (3.85%) were from Meghalaya. Prevalence of the resistant genes in poultry birds was found to be slightly higher in Meghalaya in comparison to Assam.