There's still about 10 weeks to go - anything can happen in that time, given people's propensity towards mindless panic in the case of a mild threat. I'm not joining in with the panic, just considering the possibilities. It's only a form of flu, but people do like a good disaster scenario. Behind closed doors is the obvious solution, but there's also the chance that a number of players themselves could get it. They're all super-fit so should just shake it off, but it would still probably keep them out for a few weeks.