“TB and Polio were nonexistent when I was a child “
My father died of TB and polio was a big fear into my young adulthood.
I thought we had seen the last of them.
I had relatives who went down. But the complete vaccination programs removed these things.
My parent’s generation usually had at least one or two dead or paralyzed in each family. Very bad, sanatoriums were everywhere. Basically not much to do except fresh air and maintenance, eventually iron lungs.
Occasionally there are minor outbreaks in the real pit-holes/third-world-sewers of the world.
Bangladesh had one years ago. Never made the news here but we were OVER THERE (Saudi Arabia) and saw, read and heard the news.
Researchers keep an amount of smallpox around JUST for those contingencies.