Carlyn Nichols's List: Infectious Diseases/Contagions

dsc.discovery.com/...10-worst-epidemics.htm discovery channel science contagious diseases epidemic virus bacteria

www.urbanrim.org.uk/diseases.htm diseases history infectious biology epidemics

health.usnews.com/...-diseases-that-altered-history diseases history infectious biology epidemics

www.cdc.gov/DiseasesConditions cdc diseases conditions

www.who.int/en health WHO diseases conditions