You could be sick right now and you wouldn’t even know it!
Okay, well, maybe that’s a bit shitposty. But it’s not that big a departure from reality. Who knows what kind of nasties you’re carrying around in your body right now. Laying in wait until they’re strong enough to make a move.
And who knows what kind of nasties that person next to you on the bus is carrying. They seem healthy enough, surely they’re not an attack vector? But then they cough, or sneeze, or breathe heavily in and around your general direction. That’s thousand, no, millions of tiny biological weapons released. They could be coming for you!
I wonder if there’s a name for the fear of disease, specifically in those around you.