Definition of Lassa fever in US English:

Lassa fever


  • An acute and often fatal viral disease, with fever, occurring chiefly in West Africa. It is usually acquired from infected rats.

    • ‘Other viral illnesses include influenza, the common cold, Lassa fever, and ebola.’
    • ‘Recently cholera has occurred in India and Peru; dengue in Panama, New Guinea, and Australia; yellow fever, Rift Valley fever, and Lassa fever in Africa.’
    • ‘Advisories issued in 1998 by the Centers for Disease Control warned travelers to Sierra Leone that malaria, measles, cholera, typhoid fever, and Lassa fever were prevalent throughout the country.’
    • ‘But he said he did not think he had Lassa fever because his severe thigh-muscle aching was a symptom the nurses had escaped.’
    • ‘You might have one of them weird Jungle diseases like Lassa fever or the Clap.’


1970s: named after the village of Lassa, in NW Nigeria, where it was first reported.


Lassa fever