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METHICILLIN-resistant Staphylococcus aureus (MRSA) has been reported in human medicine as a cause of nosocomial and community-associated infections (Otter and French 2010). In veterinary medicine, MRSA strains have been identified in a wide range of animals and diseases (Leonard and Markey 2008, Fessler and others 2009, Huber and others 2010, Türkyilmaz and others 2010), thus it is considered an emerging threat with a high zoonotic potential (Juhasz-Kaszanyitzky and others 2007). MRSA sequence type (ST) 1, spa type (t) 127 has been mostly isolated from community-associated infections, but t127 has seldom been identified in bovine and swine (Hasman and others 2010).
The present report regards a dairy cow with an intramammary infection by MRSA ST1, t127 that was investigated over an entire lactation and submitted to histological evaluation of mammary tissue to explore both bacterial molecular features and host immune response in the milk and mammary tissue. The study was performed because only a few mammary infections of the dairy cow by this particular strain have been reported and no information is available on the interaction between the bacteria and the mammary gland.
A five-year-old Holstein-Friesian dairy cow from a closed herd located in Milano province, Italy, consisting of 25 lactating cows, showed an intramammary infection with S aureus in both right quarters. The isolate revealed a multidrug resistance profile by the agar-plate method, and PCR analysis (Costa and Palladini 2005) confirmed the presence of mecA genes in both isolates, which were consequently classified as MRSA. The farmer decided to antibiotic treat and dry off the animal, despite the …
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