In an outbreak of cholera in a village with a population of 2000, 20 cases have been reported of which 5 have died. Case fatality rate is:
Correct Answer: 25%
Description: Case fatality rate represents the killing power of a disease.
It is simply the ratio of deaths to cases. The time interval is not specified. Case fatality rate is typically used in acute infectious diseases (e.g. , food poisoning, cholera, measles). Its usefulness for chronic diseases is limited, because the period from onset to death is long and variable. The case fatality rate for the same disease may vary in different epidemics because of changes in the agent, host and environmental factors. Case fatality is closely related to virulence.
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