Health officials are investigating the Playboy Mansion over fears Hugh Hefner’s famed property is the source of a recent disease outbreak.

More than 75 conference guests who attended a fundraiser at the Los Angeles residence were reportedly struck down by a respiratory infection.

Four Swedish men who attended the event were diagnosed with Legionellosis or pontiac fever, a milder form of Legionnaires disease caused by bacteria that thrives in warm air-conditioning systems.

A fog machine used at the bash could have spread the illness.

Over 700 guests were attending an event on February 3 as part of the annual DOMAINfest Global conference.

Many of the victims started tweeting and posting their symptoms on Facebook and that’s when organizers of the conference noticed a trend.