COVID tests?
Ohhh yeah.
But smallpox?
Thanks to vaccines, you haven't had to worry about that one since 1977.
The purpose of vaccines is to induce the immunity that is a consequence of natural infection without having to suffer the price of natural infection.
Historically, that price was often death.
When my parents were children in the 1920s, their parents, my grandparents, were scared of diphtheria, which killed 15,000 children a year.
And they were scared of pertussis, or whooping cough, which would kill 8,000 children a year.
Vaccines changed all that.
My parents weren't scared of diphtheria, and they weren't scared of pertussis because we had a diphtheria and pertussis vaccine by then.
