Smallpox: Smallpox is the most famous example. Measles is the most contagious disease and was deadly to the American Indians because it was new to them. Ebola has a high fatality rate but isn't super-catching. Pneumonia plague is very deadly but tends to vanish except during epidemics of ordinary plague. HIV untreated is deadly but is quite hard to catch.
Answered 12/29/2014
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