title: Antimicrobial susceptibility of Streptococcus species isolated from clinical mastitis in dairy cows.
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.
authors.affiliation: Département de Santé Publique, Laboratorie de Bactériologie, Ecole Nationale Vétérinaire de Lyon, BP 83, 69280 Marcy l'Etoile, France. v.guerin@vet-lyon.fr
authors.forename: Véronique
authors.initials: V
authors.lastname: Guérin-Faublée
authors.forename: Florence
authors.initials: F
authors.lastname: Tardy
authors.forename: Clarisse
authors.initials: C
authors.lastname: Bouveron
authors.forename: Gérard
authors.initials: G
authors.lastname: Carret
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D024881:Drug Resistance, Bacterial; D008414:Mastitis, Bovine / Q000382:microbiology*; D008826:Microbial Sensitivity Tests; D013290:Streptococcal Infections / Q000382:microbiology / Q000662:veterinary; D013291:Streptococcus / Q000187:drug effects* / Q000302:isolation & purification*
chemical_list: D000900:Anti-Bacterial Agents