They were rural and burned themselves out once people stopped visiting the hospitals where they were transmitted through shared needles. This is a great book t

They were rural and burned themselves out once people stopped visiting the hospitals where they were transmitted through shared needles. This is a great book that covers many early outbreaks: http://www.amazon.com/The-Coming-Plague-Emerging-Diseases/dp/0140250913/ http://www.amazon.com/The-Coming-Plague-Emerging-Diseases/dp...