And one either has a severe case of the flu or one doesn't. The spectrum of severity of a disease is infinite, and where you land on it is determined by, what? How much immunity you have. If you have complete immunity, you don't get sick, even if germs are present in or on your body. If you have some, or partial, immunity you get some level of severity of the illness depending on your level of immunitThey.
It's clearer now, more than ever, why our country got into the trouble it has, and it's been a problem long before Trump became president. I'm with
@JJinVA, only people with the ability to grasp nuanced concepts should be allowed to vote.