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in vitro susceptibility of selected isolates of brucella abortus to penicillin.brucella abortus isolates (n = 134) from 38 dairy herds in vermont, florida, and canada exhibited 2 growth patterns on medium containing 5 u of penicillin/ml. the b abortus isolates from 7 herds in vermont were always susceptible to the antibiotic at that concentration. eleven of 12 isolates from 1 herd in florida and 25 isolates (biotypes 1 and 4) from 30 canadian herds grew at greater than or equal to 5 u of penicillin/ml, as determined using a gradient plate method. penicillin susceptibility ...19826803623
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