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Lassa fever

1 active outbreak

963

Confirmed cases

229

Deaths

23.8%

Case fatality rate

1

Countries affected

Updated: July 24, 2026

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Clinical profile

Pathogen

RNA virus

Arenaviridae

Incubation

6–21 d

CFR (reference)

~1 % global; 15 % hospitalisé

Vaccine

Not available

Ribavirin (early phase)

Treatment

Available

Transmission

Direct contactZoonoticNosocomial
WHO factsheet →

Active outbreaks

Nigeria

963 cases· 229 deaths· Jul 11, 2026(30d)

→HIGH RISK

Countries affected(1)

Nigeria

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