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. Because of the habits of the times, the way that people lived, even the rich, and the way that the fleas were transmitted on these trade routes along clothing lines, even fine linens, this would reach the upper class as well. And even though the poor had a higher rate, probably because they were congregated together in smaller spaces, this didn't spare all the rich people. In fact it was monasteries that were probably the most susceptible to the disease because priests going to give last rites, bringing that back amongst an isolated community, and it's spreading quite quickly with some monasteries experiencing a 100% rate of death.