title: Isolation of Streptococci from milk samples of normal, acute and subclinical mastitis cows and determination of their antibiotic susceptibility patterns.
abstract: Streptococci are frequently isolated from bovine mastitis in dairy cows with only limited information available on the antimicrobial susceptibility of these organisms. A total of 42 Streptococci isolated from 148 milk samples of normal, sub acute and acute bovine mastitis cases. Overall, 35% of the strains tested were Streptococcus dysgalactiae, Streptococcus agalactiae 26%, Streptococcus uberis 18 and 4% were Enterococcus sp. Differences between the number of isolations in acute and sub acute groups were statistically significant, (p<0.5). The antimicrobial susceptibility for these organisms was determined for the following antimicrobial agents: cephalexine, penicillin, clindamycin, cloxaciline, gentamicin, streptomycin, amoxicillin, tetracycline, kanamycin, oxytetracycline, ampicillin, chloramphenicol and erythromycin. S. agalactiae, S. dysgalactiae, S. uberis and Enterococci demonstrated high level of resistance against streptomycin, penicillin and cloxaciline. Low level of sensitivity to other tested antimicrobials was demonstrated.
authors.affiliation: Department of Pathobiology, School of Veterinary Science, Shahrekord University, Shahrekord, Iran.
authors.forename: Azizollah
authors.initials: A
authors.lastname: Ebrahimi
authors.forename: Farzaneh
authors.initials: F
authors.lastname: Nikookhah
authors.forename: Saeed
authors.initials: S
authors.lastname: Nikpour
authors.forename: Farya
authors.initials: F
authors.lastname: Majiian
authors.forename: Masoud
authors.initials: M
authors.lastname: Gholami
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002417:Cattle; D005260:Female; D008413:Mastitis / Q000382:microbiology / Q000662:veterinary*; D008826:Microbial Sensitivity Tests; D008892:Milk / Q000382:microbiology*; D013045:Species Specificity; D013291:Streptococcus / Q000145:classification / Q000187:drug effects / Q000302:isolation & purification*
chemical_list: D000900:Anti-Bacterial Agents