And of course anybody who comes into contact with these people, and if you're losing half the population, where are you going to bury the bodies? Just think of that. So they're drilling big pits and they're throwing the bodies over the city walls and they're decaying and the fleas are hopping around. And every time someone leaves, the fleas are leaving and traveling and of course because of the ships and the trading ports, it's going to travel much faster than if it was just human to human contact with pneumonia or something like that. The bubonic plague is going to wreak havoc. Another interesting fact was the city of Ragusa in 1377 was the first city in the world to institute a quarantine, so it seems as though some people were getting the message. It's also important to say that this is not just a disease of the poor.