Shiraz University Iranian Journal of Veterinary Research 1728-1997 8 1 2007 03 01 Drug resistance in isolated bacteria from milk of sheep and goats with subclinical mastitis in Shahrekord district 76 79 2711 10.22099/ijvr.2007.2711 EN A. Ebrahimi Department of Pathobiology, School of Veterinary Medicine, University of Shahrekord, Shahrekord, Iran Sh. Lotfalian Laboratory of Microbiology, Department of Pathobiology, School of Veterinary Medicine, University of Shahrekord, Shahrekord, Iran S. Karimi Laboratory of Diagnostic, Department of Clinical Sciences, School of Veterinary Medicine, University of Shahrekord, Shahrekord, Iran Journal Article 2005 01 22 Four-hundred milk samples from half udders of 20 flocks of native breed goats were aseptically<br />collected. The samples were examined by California mastitis test (CMT). Twenty-one (5.25%) of 400 were<br />CMT-positive. The CMT-positive samples were then cultured and the following bacteria were isolated:<br />Staphylococcus aureus in 3 (14.28%), CNS (coagulase-negative staphylococci) in 14 (66.66%), streptococci<br />in 4 (19.04%) and Mycoplasma spp. in 11 (52.38%) samples. The isolated staphylococci were examined to<br />evaluate their resistance to different antibiotics by disc diffusion method. CNS resistance to amikacin was<br />78.5%, to penicillin was 50%, to tetracycline 50%, to ampicillin 42.8%, and to doxycycline was 28.5%.<br />Four-hundred native breed sheep milk samples were taken from 19 flocks in the same conditions. The<br />samples were examined by CMT test. 19 (4.75%) of 400 were CMT-positive. The CMT-positive samples<br />were cultured and the following bacteria were isolated: S. aureus in 2 (10.5%), CNS in 7 (36.8%),<br />streptococci in 2 (10.5%), Pasteurella in 1 (5.26%) and Mycoplasma in 9 (47.37%) samples. The isolated<br />staphylococci were examined for antibiotic susceptibility. CNS resistance to amikacin was 42.8%, and to<br />tetracycline, ampicillin, oxycycline and penicillin was 14.3%. Both isolates of S. aureus were resistance to<br />penicillin. https://ijvr.shirazu.ac.ir/article_2711_5f7f07ab25b6d8cd205423cfa96b8e5f.pdf