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What are the most deadly viruses?

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In terms of their rate of lethality (not necessarily the number of people who die each year from infection), the most dangerous viruses are:

  • Rabies (100% kill rate in most mammals; only a handful of humans have survived)
  • Smallpox (50% to 90% mortality rate; no longer found in wild)
  • Ebola virus (68% mortality rate)
  • Anthrax (50% to 100% mortality rate, depending on strain)
  • Marburg virus (60% to 90% mortality rate)

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