"[According to 1348 theorists, poisoning of Christian water by Jews was the cause of Black Death.]

Even the poison used to contaminate the Christian water supply was described in meticulous detail. It was "about the size of an egg," except when it was the "size of a nut" or a "large nut," "a fist" or "two fists"- and it came packaged in "a leather pouch," except when it was packaged in "linen cloth," "a rag," or a "paper coronet"; and the poison was variously made from lizards, frogs, and spiders- when it was not made from the hearts of Christians and from Holy Communion wafers."
— John Kelly (The Great Mortality: An Intimate History of the Black Death, the Most Devastating Plague of All Time)