Abstract
Streptococcus (S.) species are important pathogens that cause mastitis insheep. The study aimed toexamine Streptococcus species insheep milk with subclinical mastitis, assessing their prevalence, antimicrobial resistance, and virulence genes. Atotal of200milk samples were collected from sheep farms inİzmir's five districts. Out of32 (28.6%) Streptococcus isolates identified byphenotypic methods, 25 were genotypically identified asS.uberis, 5asS.agalactiae, and 2 asS.dysgalactiae. Disk diffusion was used todetermine the antimicrobial resistance oftheisolates. PCR was employed toidentify antimicrobial resistance and virulence genes inthe isolates. Thehighest resistance was found for cloxacillin (100%), and the highest sensitivity was found for florfenicol (84%). Themost common resistance gene combination was tetM+tetS (3/32) for S.uberis in9.4%. Atotal offive virulence genes were detected. GapC+sua (56.2%) constituted the most common gene pattern. The highest virulence gene gapC was detected in78.1% (25/32) ofthe isolates. The cylE gene was not detected (0%) inthe isolates. Streptococcus species may play arole inmastitis insheep, emphasising the need for meticulous hygienic milking practices.
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