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Diseases » Lassa fever » Stats

Statistics about Lassa fever

Prevalence and incidence statistics for Lassa fever:

See also prevalence and incidence page for Lassa fever

Worldwide prevalence of Lassa fever: The number of Lassa virus infections per year in West Africa is estimated at 100,000 to 300,000, with approximately 5,000 deaths. (Source: excerpt from Lassa Fever: DVRD)

Mortality rate for Lassa fever

Approximately 15%-20% of patients hospitalized for Lassa fever die from the illness. However, overall only about 1% of infection with the Lassa virus result in death. The death rates are particularly high for women in the third trimester of pregnancy, and for fetuses, about 95% of which die in the uterus of infected pregnant mothers. (Source: excerpt from Lassa Fever: DVRD)

About statistics:

This page presents a variety of statistics about Lassa fever. The term 'prevalence' of Lassa fever usually refers to the estimated population of people who are managing Lassa fever at any given time. The term 'incidence' of Lassa fever refers to the annual diagnosis rate, or the number of new cases of Lassa 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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