Archaeologists studying the Bubonic Plague in London have determined that the evidence from plague burials and water-front graves suggest that the disease was spread from human to human contact (rather than from flea infested rats).
“The evidence just isn’t there to support it,” said Barney Sloane, author of The Black Death in London. “We ought to be finding great heaps of dead rats in all the waterfront sites but they just aren’t there. And all the evidence I’ve looked at suggests the plague spread too fast for the traditional explanation of transmission by rats and fleas. It has to be person to person – there just isn’t time for the rats to be spreading it.” (Guardian)