Published paper on Phenotypic and Genetic Antibiograms of Methicillin-Resistant Staphylococci Isolated from Bovine Mastitis in Korea ( 07/08/10 ) | |||||
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Part | Charger | moonjs | date | 07/08/10 | |
in this study, we investigated that the relationship between phenotypic antimicrobial resistance and coagulase genotype of S. aureus was determined. The staphylococci strains (835 S. aureus and 763 CNS) were isolated from 3,047 bovine mastitic milk samples from 153 different dairy farms in 8 provinces from 1997 to 2004 in the Republic of Korea. Their antibiogram and the polymorphism of coagulase gene were studied. 21 (2.5%) S. aureus and 19 (2.4%) CNS strains were resistant to methicillin (oxacillin MICs ≥ 4 μg/ml). The mec A gene was also found in 13 MRSA and 12 MRCNS isolates with the higher detection rate of mec A gene in MRSA with high MIC (≥ 16 µg/ml) compared with those with MIC (≤ 8 µg/ml). Among 10 different coa PCR-RFLP patterns (A-J) in 706 S. aureus strains, the main types were A (26.9%), B (17.0%), G (10.5%), and H (15.4%) with the frequent observation of the A and H types (6 and 10 isolates) in MRSA. This study indicates that MRSA and MRCNS are more resistant to other antibiotics than methicillin-susceptible staphylococci, major epidemic S. aureus clones may be spread between different dairy farms, and the control of specific prevalent coagulase genotypes of particularly MRSA is needed. (Journal of Dairy Science 90:1176-1185)
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