I know a man who developed mastitis. He was definitely not breastfeeding! :-) Don't know the details as to the type of organism but it required *weeks* of antibiotic treatment. He was um, embarrassed, I think, but his wife, who'd nursed three, thought it was "just deserts." I don't know if this is so strange to get into "Ripley's Believe It or Not," but it's the only case of a male with mastitis I've heard of! Mary Renard, who spent years assuring women that yes, mastitis feels like hell and then finally found out what I meant! (It felt like hell!)