Thousands of BART riders were potentially exposed to measles after an infected UC Berkeley student rode the train last week. Anyone who rode on BART between February 4 and February 7 in the morning or late evening could have been exposed.

Tens of thousands of starfish in the Pacific are dying from a mysterious illness that causes their arms to walk away from them until they rip out.

First Princeton, and now the University of California Santa Barbara. The California school is having a meningitis outbreak. There have been four reported cases so far, and it's pretty serious. One infected lacrosse player had to have his feet amputated last month.

The yellow fever mosquito, also known as Aedes aegypti, has been buzzing around California, leaving larvae in Madera, Fresno and the Bay Area. The species is known to transmit yellow fever, dengue, and other diseases, but must first bite an infected person before it can spread disease.

Porn participants will continue to go raw for the foreseeable future — even as four performers tested positive for HIV in the last month — after California lawmakers rejected a bill that would make condom use mandatory during filming.

A colony of Herpes-infected Rhesus monkeys, flinging their feces and viral loads through Florida, now pose an official public health threat to the Sunshine State.

Another US-based adult film actor tested positive for HIV this week, making the unidentified performer the third porn actor to test positive in the last month. Adult film actress Cameron Bay tested positive at the end of August, and her boyfriend, actor Rod Daily, announced on Tuesday via Twitter that he also tested positive.

New Jersey can now add the mumps to the list of diseases that the Jersey Shore is synonymous with.

The FDA announced this week that a Mexican salad mix served at Iowa and Nebraska Olive Gardens and Red Lobsters contained parasites that cause a severe stomach virus called cyclospora, giving bottomless salad bowls a whole new meaning.

The Centers for Disease Control says that more than 250 people in six states have come down with a stomach bug from an unidentified source. The cyclospora infection — which causes diarrhea and other flulike symptoms — has been reported in Iowa, Nebraska, Texas, Wisconsin, Georgia and Connecticut, and could be a foodborne illness.

An airborne fungal disease without a cure, coccidioidomycosis — also known as valley fever or cocci — is affecting more people than ever in the Southwest, where more than 20,000 cases have been reported this year.