Sources say they first became aware of their potential exposure on March 9, when various cast and crew members began reaching out to each other to share the news. Several people are said to have contacted both Fox and 20th Century Fox Television, but the only response they received at that time was that the studio was “working on a memo” to address the issue. One person who spoke with Variety said they received calls from crew members working on another show in the Chicago area inquiring about rumors of an infection before they heard from the studio or network.