Smallpox, for example, was “Nature’s call” too. Thankfully, through much personal suffering and death and cost...and effort...it was eradicated.
English physicians noticed that milkmaids were immune to smallpox, as a result of being exposed to the less severe cowpox.
for all we know C19 could well be the 'cowpox'
that helps the population gain immunity against
something potentially worse.
