Many answers: I will vote for largest numbers as well as overall nastiness (my opinion): virus: 1. Influenza - killed most people in pandemics 2. Ebola - evil, nasty, dead quickly (but rare) bacteria: 1. Yersinia pestis - plague pandemics 2. Clostridium botulinum - botulism toxin is very very toxic in small amounts.
Answered 12/10/2013
4.9k views
That depends: are you asking about most # of deaths over history or virulence of actual organisms. I can't state #1. But the following are serious: Ebola, Influenza, Pneumonic Plague, Smallpox, SARS, Tetanus, Inhalational Anthrax & more. For more info see "List of human disease case fatality rates" http://en.wikipedia.org/wiki/List_of_human_disease_case_fatality_rates
Answered 10/5/2014
3.7k views
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