What exactly happened in the great plague why did it happen and was it a group of people that got mad and killed

What exactly happened in the great plague why did it happen and w…?

http://www.chacha.com/question/what-exactly-happened-in-the-great-plague-why-did-it-happen-and-was-it-a-group-of-people-that-got-mad-and-killed

The plaque was a disease epidemic. It caused horrible skin rashes and terrible painful death.