> Is there any virus in the history of mankind that does this? Yes. The common cold is a set of symptoms that are caused by many things, but a majority of inst

> Is there any virus in the history of mankind that does this? Yes. The common cold is a set of symptoms that are caused by many things, but a majority of instances are caused by rhinovirus. It is possible for people to be infected by the same strain multiple times, but more importantly there are over 100 variations they can catch, and previous infections from one variation do not protect against another. The worst case scenario for covid was exactly that.