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Published on: November 4, 2016
Antimicrobial susceptibility of Streptococcus species isolated from clinical mastitis in dairy cows
Véronique Guérin-Faublée1, Florence Tardy, Clarisse Bouveron
1Département de Santé Publique, Laboratorie de Bactériologie, Ecole Nationale Vétérinaire de Lyon, BP 83, 69280 Marcy l'Etoile, France. v.guerin@vet-lyon.fr
Abstract:
The antimicrobial susceptibility was determined for 50 Streptococcus uberis, 42 S. dysgalactiae subsp. dysgalactiae and eight S. agalactiae strains isolated from cow mastitis. Only 27% of the strains were susceptible to all antimicrobial compounds tested. Resistance to tetracycline was most frequent (particularly for S. dysgalactiae strains), then macrolide and/or lincomycin resistance. High level resistance to streptomycin and kanamycin was detected. All S. dysgalactiae and S. agalactiae strains were susceptible to beta-lactams but 44% of the S. uberis strains showed an elevated penicillin G MIC. All strains were susceptible to chloramphenicol and rifampicin.
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