Are we sure it's not just the same disease lingering in some people before being passed on? I'm not really sure what sort of incubation time we might be dealing with. Or maybe it's just making its second round, if it's managed to mutate enough already, like a cold? I thought it was running its course in a few days for everyone? Is that not the case any more?

[ Granted, she doesn't really see everyone on any given day. If you're gravely ill, you're probably not coming to breakfast or dinner, and she's holed up in her room or the lab for the bulk of most of her free time lately. ]