Detection of Bacterial Isolation and Antimicrobial Resistance Profiles in Goat Mastitis

Mastitis is one of the most common infections worldwide. This infection poses risks to animal and public health. Therefore, determination of mastitis pathogens is important for the prevention of the infection. Generally, the combination of antimicrobials is an effective, reliable and common treatment approach. In this study, it was aimed to determine the bacterial mastitis pathogens in goat's milk and antimicrobial resistance profiles of these pathogens. A total of 190 goat milk samples were examined with standard microbiological analysis in the period of 2018-2019. Bacterial mastitis pathogens were obtained in 33.2% of all samples. Totally, 79 different bacterial agents were isolated due to multiple-bacterial isolation. Major genus was detected as Staphylococcus spp. (66%): coagulase-negative Staphylococcus (CNS) 44% and coagulase-positive Staphylococcus (CPS) 22%. This group was followed by respectively Bacillus spp. (17.6%), catalase-negative cocci (PNC) (14%), Mannheimia spp. (1.2%) and Micrococcus spp. (1.2%). The most prevalent species were identified Staphylococcus caprae (27%), Staphylococcus aureus and Staphylococcus chromogenes (13%), Aerococcus viridans and Bacillus cereus (7.6%). Considering the antimicrobial resistance test, tetracycline has the highest resistance rate (31%) among the tested antimicrobials. A total of 4 multi-drug resistant isolates were found: an Enterococcus faecalis and three Streptococcus uberis isolates. The highest resistance rate (35.7%) was observed for penicillin in all Bacillus spp. isolates.