Don't have to invent anything - I'm old enough to actually remember things like polio and rampant TB. I doubt you are quite that old.
As a kid, I played with a family of 3 boys and 2 girls who lived round the corner fom us in ChCh. When in primary school they introduced the test jab to see what diseases were endemic, I tested positive for TB. Of the family I played with then there is only one alive now. They were the source of my TB.
If you seriously wish to go back to those times, you're on your own mate.
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