'Pontiac Fever' Crashed Playboy Mansion Party

The culprit behind the dozens of people sickened after a party at Playboy Mansion? Officials think it's Pontiac Fever, a milder form of Legionnaires' disease that's known as legionellosis. The bacterium that causes legionellosis lives inside warm water and can take root in ventilation systems; some suspect that a fog machine used at the party may have spread the disease, the LA Times reports.