People are not immunized against small pox any more, are they?
Some people are particularly susceptible. Apparently, having eczema is a huge risk factor.
When I was a child, because of the eczema, I never got the vaccine. Our dr said it was too dangerous for me, but if there ever was an outbreak, then I would have to be one of the first to get it, risk notwithstanding, because of how I would react to the actual disease.
https://www.businessinsider.com/bill-gates-covid-will-be-back-big-numbers-october-november-2020-6
But it could be any of a myriad of diseases.
Here are Bill and Melinda smirking like foxes over “the next one” getting our attention.