Sensitivities of Escherichia coli isolated from bovine and porcine enteric infections to antimicrobial antibiotics.

The antibiotic sensitivities of Escherichia coli isolated from 91 diarrheal pigs and 98 diarrheal calves were determined to 19 different microbials by the Kirby-Bauer method. Virtually all E coli isolated from pigs and calves were sensitive to amikacin, colistin, gentamicin, and polymyxin B. In vitro minimum inhibitory concentrations for these 4 antibiotics were determined for isolates from both pigs and calves.