Dymak
Player Valuation: £40m
It could be because after the First World War, the Spanish Flu had 2 waves, so people think this will. Plus if it slows down and people think it's gone and start going to mass gatherings again, it could start back up, a second wave.
The second wave of Spanish Flu was worse, obviously as a world we are cleaner...etc now but a 2nd wave is still a worry.
I'm not sure how the Spanish Flu ever went away, but the normal flu comes back every year, often in a slightly different strain. That's why I think people consider further 'waves' of this virus to be probable rather than improbable.