From what I know of Diphtheria, it can cause paralysis and death.
My Dad’s sister Ruth died from Diphtheria when he was very small.
That had to be around 1932. She was 8 yrs old.
Diphtheria comes from a bacteria which is easily spread. It starts as a mild sore throat, then a membrane forms in the throat and can move down to block the windpipe.
It also spreads through your bloodstream as a toxin, which can cause paralysis, heart failure and death.
The D in DPT shots we get our babies is Diphtheria Vaccine.