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MRSA risk surge among children
Children often are not too friendly to the integrity of their skin; not overly concerned about hygiene; typically spend many hours with other kids, in day care centers, in school, camps, on playgrounds, or just hanging around; they share, or use things that other kids have used; and they still have immature, not fully functional immune system.
All those things make being a child the risk factor for getting invasive MRSA infection.
Methicillin-resistant Staphylococcus aureus (MRSA) is any strain of this bacterium resistant to methicillin, a penicillin derivative that was effective against bacterial strains resistant to other penicillins. That is, until new strains - like some Staphylococcus aureus strains - emerged that were resistant to it as well.
While methicillin is out of use for quite a while, being replaced by newer penicillin formulas, the original term remained.