Starting Tuesday, both game shows will tape without live audiences, according to TMZ. "Our sources say there are 3 primary concerns ... one of which is exclusive to Jeopardy," TMZ reports. "Alex Trebek, who is battling stage 4 pancreatic cancer, has a compromised immune system from chemotherapy and other treatments. We're told execs felt it was too risky to expose him to large audiences. There are two other concerns ... most of the audience members for both Jeopardy and Wheel are older -- lots of folks in their 60s -- and they are the most vulnerable to contract the virus and not beat it. The third factor is that a number of people who attend tapings are from out of town and such travel is risky, given the spread of the virus." Jeopardy! and Wheel don't have a timeline on when they'll bring back their studio audiences.