>>514712604
Fun fact: medieval europeans determined it was jews poisoning wells, worsening the effects of the plague greatly. How did they do it?
Well for starters, there was no commonality between the groups who gathered together and the groups who caught the plague (this is easily checked by comparing parish records to sick people), indicated that something unnatural was spreading it.
What there was commonality between, however, was dead people and the wells they used. Lots of dead people used certain wells.
On top of this, in Italy they actually caught (((doctors))) poisoning the well red-handed and executed them.