Prevalence and drug-susceptibility of enterohemorrhagic Escherichia coli O157 in cattle during the summer
2005
Maehara, T.(Osaka-shi. Meat Inspection Center (Japan)) | Kita, T. | Fujino, Y. | Tsujimoto, M.
In cattle, prevalence of Escherichia coli O157 (O157) increases during the summer. To investigate this prevalence, we isolated O157 from gastrointestinal contents in summertime. The bacteria were isolated from 22 of 55 (40.0%) animals. Six animals (27.3%) tested O157-positive for rectal contents only, 10 animals for rumen contents only, and six animals for both. Thus prevalence was especially high in rumen contents. The average number of O157 bacteria in rectal contents was 44CFU/g. The maximum number was 3.8 x 10(4)CFU/g, but values were 10CFU/g in more than 40% of the samples. Investigation of drug-susceptibility in all 28 isolates showed that 15 were resistant to SM, 11 to ABPC, 4 to CEZ, 4 to FOM, 3 to NA, and 2 to KM. Significantly 4 isolates (14.3%) resisted FOM, which is commonly used to treat human O157 infection.
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