Reading a thread of comments on a poll about where people stand on covid mitigations and seeing someone proclaim "I know when I have covid/flu" so they know not to see people if they have symptoms
My good man, a large quantity of covid infections are asymptomatic (but can still spread) with figures quoted at 25%, 45% even up to 60% of infections. I know this is inconvenient but it is the reality of the situation