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Study: MRSA originally came from cattle

August 16, 2013

EDINBURGH, SCOTLAND — A study here is claiming that methicillin-resistant Staphylococcus aureus (MRSA) strain of bacteria crossed over to humans, Business Standard reported.

MRSA strain CC97 causes skin and other soft tissue infections in humans, and is an emerging human pathogen on five continents, according to the article.

There is potential for cows to serve as a reservoir for bacterial with the capacity for pandemic spread to humans, the article stated.

Based on molecular clock using mutation rates, strains of CC97 appear to have jumped to humans from cattle in two instances — the first occurred between 1894 and 1977 while the second took place between 1938 and 1966, the article noted.

After the CC97 strains crossed over to humans, they developed new capabilities, including the ability to resist methicillin, according to the article.

This indicates that the human strains developed resistance presumably through exposure to antibiotics, the article stated.

Click here to read the article in its entirety.