"It's everywhere," Ng said, especially in school sports and health club settings where athletes have abrasions. About 90 percent of all these community MRSA cases begin as skin infections
"The bacteria needs an entry point in the body," she said. "In wrestling, one can be a carrier and the other can be infected ... with little abrasions and close skin contact."
"Most schools use a detergent disinfectant that is effective against MRSA," she said. "But it's something that can happen, even in a sterile environment."
Wright said that the school had been routinely "diligent" about disinfecting mats four times a day, despite the apparent outbreak. Those cleanings have been increased.
The school has encouraged students to take their clothes home each day and make sure they are clean before returning to school. They have also kept athletes out of competitions to minimize spreading.
"We feel we have probably tried to do everything we can to stop it in its tracks," said Wright.