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Antimicrobial drug susceptibility of Leptospira interrogans serovar hardjo isolated from cattle.

The susceptibility to commonly used drugs of 18 isolates of Leptospira hardjo from the kidneys of feedlot cattle from different sources was determined quantitatively. All isolates were susceptible to penicillin G, ampicillin, tetracycline, erythromycin and streptomycin. Susceptibility to sulphamethazine was ambiguous. No drug resistance was detected and the results were similar to those described for other serovars.