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Diseases » West Nile fever » Stats

Statistics about West Nile fever

West Nile fever: Rare Disease Status

West Nile fever is listed as a "rare disease" by the Office of Rare Diseases (ORD)...more »

Mortality rate for West Nile fever

Among those with severe illness due to West Nile virus, case-fatality rates range from 3% to 15% and are highest among the elderly. Less than 1% of those infected with West Nile virus will develop severe illness. (Source: excerpt from West Nile Virus Questions and Answers: DVBID)

About statistics:

This page presents a variety of statistics about West Nile fever. The term 'prevalence' of West Nile fever usually refers to the estimated population of people who are managing West Nile fever at any given time. The term 'incidence' of West Nile fever refers to the annual diagnosis rate, or the number of new cases of West Nile fever diagnosed each year. Hence, these two statistics types can differ: a short-lived disease like flu can have high annual incidence but low prevalence, but a life-long disease like diabetes has a low annual incidence but high prevalence. For more information see about prevalence and incidence statistics.


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