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Background  Methicillin-resistant staphylococci (MRS) are increasingly being isolated in bovine mastitis. The aim of our study was to evaluate the occurrence of MRS in Finnish mastitis milk samples and characterize the MRS isolates using molecular methods.    Results  Methicillin-resistant  S. aureus  (MRSA) was a rare finding in bovine mastitis in Finland. Only two out of 135 (1.5%)  S. aureus  isolates were positive for  mec  genes. One of these carried  mec A and was of  spa  type t172, SCC mec  type IV and ST375, and the other harboured  mec C, being  spa  type t3256, and ST130. MRSA ST375 is common among human MRSA isolates in Finland, but this is the first report in the country of bovine  mec C MRSA. In coagulase-negative staphylococci (CoNS) originating from bovine mastitis, methicillin resistance was more common. In the two CoNS collections studied, 5.2% (17/324) and 1.8% (2/110) of the isolates were  mecA  positive. Eighteen of these were methicillin-resistant  S. epidermidis  (MRSE), which were divided into 6 separate PFGE clusters. One pulsotype was detected in different parts of the country, indicating clonal spread. Most MRSE (13/18) were of SCC mec  type IV, one was of type V and four were non-typeable. Comparison with a human staphylococcal database indicated that bovine MRSE strains were not closely related to human MRSE isolates.    Conclusions  The occurrence of MRS, especially MRSA, in bovine mastitis in Finland was low. Most methicillin-resistant bovine CoNS are MRSE, and we found evidence of a bovine MRSE strain that may spread clonally. This is the first report of a Finnish bovine isolate of MRSA  mecC   ST130. The study provides a baseline for further MRS monitoring.

Occurrence and characterization of methicillin-resistant staphylococci from bovine mastitis milk samples in Finland