In epidemiology, case fatality (CF) or fatality rate, is the ratio of deaths within a designated population of people with a particular condition, over a certain period of time. An example of a fatality rate would be 9 deaths per 10,000 people at risk per year. This means that within a given year, out of 10,000 people formally diagnosed with a disease, 9 died.
The rate for the Spanish flu was >2.5%,[1] about 0.1% for the Asian and Hong Kong flus,[2] and <0.1% for other influenza pandemics.[1]
Zaïre Ebola Virus is among the deadliest viruses with a case fatality rate of roughly 90%.[3] Rabies, if contracted by an unvaccinated individual who does not seek prophylactic treatment, is also an extremely deadly virus, with a case fatality rate approaching 100%.
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