Lassa fever

Patients should avoid contact with other people if they have, or think they have, Lassa fever. Patients should seek immediate advice from a healthcare professional if Lassa fever is suspected.

Although the evidence is lacking, it is suggested that the Lassa virus can be transmitted via semen for up to 3 months after disease onset. Furthermore, guidelines report that sexual intercourse should be avoided for 3 months to avoid sexual transmission.[8]UK Health Security Agency. Lassa fever: origins, reservoirs, transmission and guidelines. Feb 2022 [internet publication]. https://www.gov.uk/guidance/lassa-fever-origins-reservoirs-transmission-and-guidelines