Abstract
Two hundred fecal samples of calves from dairy herds presenting diarrhea were analyzed in group age of one to 90 days, of the region of Ribeirao Preto-SP, aiming at isolating and identifying the main enteropathogens and also to determine the resistence profile to several antimicrobial drugs. Of the analysed samples, 173 (86.5%) strains of E. coli were isolated, being 53 (26.5%) strains enterotoxigenics E. coli (ETEC), whose more frequent serotypes were:O9:K35:K99 (39.6%) and O8K85:K99 (32.0%). The 120 (60.0%) others strains of E. coli were non enterotoxigenic, being more frequent the sorogroups O114 (23.3%), O119 (22.5%) and O111 (15.0%). Also were isolated 12 (6.0%) strains of Clostridium perfringens, five (2.5%) strains of Salmonella Dublin and 86 (43.0%) strains of Cryptosporidium sp. The test of sensibility for antibiotics and chemotherapics, determined for the E. coli strains disclosed a resistence of 100.0% for lincomicin, 99.4% for penicillin G and 85.5% for novobiocin. The S. Dublin strains were resistant to the penicillin G (100.0%), novobiocin and eritromicin (80.0%), lincomicin and cefalotin (60.0%). KEY-WORDS: Calf. Diarrhea. Escherichia coli. Salmonella. Clostridium. Cryptosporidium.
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