I have been seeing a lot of skin infections and many of these are due to community acquired methicillin resistant staph areus (caMRSA). The typical patient may be a teen involved in sports, but I also see this infection in young children in day care, or summer camp. The typical history is “I think I have a spider bite” and that makes your ears perk up because that is one of the most common complaints with a staph infection, which is typically not due to a bite at all.
The poor spider keeps getting blamed, and how many spiders have you seen lurking around your house waiting to pounce? The caMRSA bacteria is ubiquitous and penetrates small micro abrasions in the skin without any of us every knowing it. The typical caMRSA infection presents with a boil or pustule that grows rapidly and is very tender, red and warm to the touch. The patient will often say that they “thought it was a bite” but the lesion gets angry and red and tender very quickly and typically has a pustular center.
For most of us pediatricians, you can see a lesion and you know that it is staph. It is most common to see these lesions in athletes on exposed skin surfaces such as arms and legs, but lesions are also common on the buttocks of children who are in diapers in day care. The area is angry looking and tender and the teenage boy I saw the other day would not sit on the chair, but laid on the table on his side as he was so uncomfortable. If the lesion is pustular the doctor should obtain a culture to determine which bacteria is causing the infection, but in most cases in my office the culture of these lesions comes back as caMRSA or in the jargon Mersa. When I say Mersa, I often cause widespread panic among my patients, but in most cases to date these infections may still be treated with an oral antibiotic that covers caMRSA, such as clindamycin or trimethoprim-sulfa. Many of the lesions improve dramatically once the site is drained and cultured. I will reiterate that if possible you want your doctor to obtain a culture to identify the bacteria that is causing the infection.
To prevent caMRSA remind your student athlete not to share towels, clothing or other items. Make sure that common areas are disinfected and once again encourage good hand washing. The closure of schools or disinfecting an entire football field or area with turf is not recommended. Lastly, this is a good reminder that you only want to take an antibiotic for a bacterial infection and that overuse of antibiotics leads to resistance. That’s your daily dose, we’ll chat again tomorrow.