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Ochoa-Zarzosa, Alejandra; Loeza-Lara, Pedro D.; Torres-Rodríguez, Francisco; Loeza-Ángeles, Heber; Mascot-Chiquito, Nidia; Sánchez-Baca, Sonia; López-Meza, Joel E.
Antonie van Leeuwenhoek, 08/2008, Volume: 94, Issue: 2Journal Article
Fifteen (15) backyard farms were investigated to determine the antimicrobial susceptibility and invasion ability of S. aureus isolates from cows with subclinical mastitis in México. A total of 106 cows were sampled and 31 S. aureus isolates were recovered. S. aureus isolates were resistant to penicillin class antibiotics and susceptible to gentamicin and cetyltrimethylammonium bromide. STA9 and STA13 isolates were resistant to erythromycin (MIC > 25 μg/ml) and lincomycin (STA13, MIC > 25 μg/ml; STA9, MIC > 100 μg/ml). STA9 isolate harbors the erm (B) and msr (A) genes, whereas STA13 isolate harbors the erm (C) gene. STA9 and STA13 isolates contains the lnu (A) gene. Only 5 isolates (STA11, STA13, STA14, STA15 and STA21) were able to internalize in bovine mammary epithelial cells. These results indicate that S. aureus isolates from dairy backyard farms showed differences in the antimicrobial susceptibility patterns and invasion ability in bovine mammary epithelial cells. This kind of evaluations should be performed in different dairy regions, since resistance patterns and isolate diversity vary on a per-region basis.
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