Outbreak of Lassa fever is reported in Nigeria. 

There has been 877 confirmed cases and 4702 suspected cases with 152 deaths and a case fatality of 17%.  

Three states, Ondo (32%), Edo (29%) and Bauchi (11%), account for the majority of confirmed cases (72%) in the country.  

Lassa fever is an acute viral haemorrhagic disease caused by the Lassa virus.  

The Nigeria Centre for Disease Control and Prevention (NCDC) and health authorities of affected states are leading the response to the outbreak.  

No vaccine for Lassa fever is currently available for use in humans.