Prevalence and Antibiotic-Resistance of Listeria monocytogenes from Sewage of Livestock Farms and Product Processing Plants
2000
Yi Chul-Hyun Kyongnam Livestock Promotion Institute, Chinju (Korea Republic) Son Won-Geun Vertreinary Molecular Biology Laboratory, Montana State University, Bozeman, USA
To investigate the epidemiological trait of listeriosis, Listeria monocytogenes were isolated from sewage of livestock farms, milk plants, slaughterhouses and poultry processing plants in Gyeongnam during the period from June 1998 to March 1999. Total 193 strains isolated were examined for serotypes and antibiotic susceptibility. L. monocytogenes were isolated from 31.8% of slaughterhouse sewage, 11.7% of poultry processing plant sewage and 5.0% of milk plant sewage but was not found in the sewage of cattle pen, pigpen and poultry houses. The serovars of 193 isolates from sewage of product processing plants were serotype 1(82.4%) and serotype 4(17.6%). The majority of the isolates from milk plant sewage were serotype 4, and those from slaughterhouse sewage were serotype 1. Antibiotic susceptibility test of all Listeria strains isolated were performed by disk agar diffusion method, using 9 antibiotics as follows; ampicillin(Am), cephalothin(Ct), chloramphenicol(Cm), colistin(Cl), nalidixic acid(Na), norfloxacin(Nf), penicillin(Pc), tetracycline(Tc) and vancomycin(Vm). Of the 193 Listria isolates, 100% were resistant to Cl, 96.0%, to Na, 46.0% to Tc and 1.6% to Nf. However, all isolates were 100% sensitivity to antisiotics such as Am, Ct, Cm, Pc and Vm. The drug resistance patterns of 193 resistant strains were distributed from one to three fold pattern, and the most common resistant patterns were Cl.Na(48.7%) and Cl.Na.Tc(45.6%).
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