more bsat questions

It has come to light that four of the cast members on MTV's Jersey Shore have STDs. Mike "The Situation" has the clap, DJ Pauly D has syphilis, Jenni "J-Woww" has crabs, and Nicole "Snooki" has herpes. The four other cast members don't have STDs (for now). If the season is going to last for eight episodes and ineach episode, a cast member with an STD has sex with another castmate, by the end of the season, how many castmates will have less than two STDs? (You don't need to be Einstein to figure this out)