Sensitivity of Brucella spp to tetracycline and its analogues.

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Abstract
The sensitivity to eight tetracyclines of 100 strains of brucellae, comprising strains of Brucella abortus, Br. melitensis, and Br. suis, was determined. Demethylchlortetracycline was the most effecitve against all the groups of brucellae, whereas oxytetracycline and chlortetracycline were the least effective. The mean MIC value for demethylchlortetracycline, doxycycline, lymecycline, and tetracycline was less than or equal to 1 mug/ml. Strains of Br. abortus biotype 2 and Br. suis were the most sensitive strains examined.