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Common European MRSA originated in Africa
Date:8/25/2014

The predominant strain of community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) infecting people in Europe, the Middle East and northern Africa derived from a single sub-Saharan ancestor, a team of international researchers reported this week in mBio, the online open-access journal of the American Society for Microbiology.

CA-MRSA refers to MRSA infections occurring in healthy people with no recent hospitalizations. The infections, which are typically skin infections, can be transmitted through close person-to-person contact or contact with a contaminated item like a towel or clothing.

"With increasing levels of CA-MRSA reported from most parts of the Western world, there is a great interest in understanding the origin and factors associated with the emergence of these epidemic lineages," said lead study author Marc Stegger, PhD, of the Department of Microbiology and Infection Control at the Statens Serum Institut in Denmark. "Our study determined that a single descendant of a methicillin-sensitive ancestor circulating in sub-Saharan Africa rose to become the dominant CA-MRSA clone in Europe, the Middle East and north Africa."

In Europe, the predominant CA-MRSA strain belongs to a family called clonal complex 80 (CC80), which are resistant to the antibiotics kanamycin/amikacin, tetracyclin and fusidic acid, in addition to beta-lactams. It was first identified sporadically in the late 1990s, but has since been identified throughout northern Africa, the Middle East and Europe, with only sporadic reports from Asia, Australia and South America.

For the study, Stegger and colleagues at 19 other institutions around the world analyzed 97 S. aureus CC80 samples from 22 countries in Europe, North Africa, sub-Saharan Africa, the Middle East and Asia isolated between 1993 and 2010. Twenty-three samples were sensitive to methicillin while 74 were resistant to methicillin. The investigators
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Contact: Jim Sliwa
jsliwa@asmusa.org
202-942-9297
American Society for Microbiology
Source:Eurekalert

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