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MRSA — it's a highly drug-resistant staph infection that has challenged researchers for years. In the past, it was mainly a problem that spread among patients in hospitals. But now, according to a study published in the Annals of Internal Medicine, a new variant of the strain that's even more resistant to antibiotics is spreading among gay and bisexual populations in San Francisco, Boston, New York, and Los Angeles. There's been a lot of talk about MRSA recently, and even more questions. Today NPR's Health Editor Joe Neel will break it down for us: prevalence, symptoms, prevention, treatment, you name it. Tell us your questions. And if you or someone you know has had it, how did you treat it? And what measures are you taking to prevent infection?