It's actually pretty damn simple and obvious. The fact that even though the basic bitch knowledge that Vitamin C (and D if you're really intelligent) is good for you failed to drain those resources as quickly as it managed to drain eggs, lettuce, milk, TP, and well any and all things that go bad pretty damn quickly and/or have nothing to do with what Corona-Chan will do to you if you manage to get infected with her "love" well...

Like I keep on saying, the average person is a dumbass barely worthy of being considered sentient. I mean fuck, this "plague" kills by flooding your lungs with fluid. TP ain't gonna save you from lethal levels of lung phlegm. I swear, I must be one of the few humans blessed with common sense on this front. Damned fucking idiots dooming us all...