a third of europe's population died over four years due to the black death. but was it really spread by rats and fleas? could it have been caused by a virus? and what has that got to do with the modern-day spread of hiv? peter lavelle delves into the dark history of the great pestilences to look for answers.
i have just added the link as the full text is too long but it is fascinating reading with a lot of modern day lessons.