- Eighteen states have been affected in "unprecedented outbreak"
- More than 3,000 people who may be at risk are being monitored
A further 766 are suspected to be infected, and 3,126 contacts have been identified and are being monitored.
, an acute viral hemorrhagic illness, is endemic in most of West Africa, especially Nigeria, where it was discovered in 1969. Symptoms can be mild or severe, including hemorrhaging in the gums, eyes or nose.
According to the US Centers for Disease Control and Prevention
, the disease is transmitted to humans through contact with food or items contaminated by multimammate rats -- or through contact with bodily fluids from an infected person.
On average, Lassa fever is deadly in 1% of all individuals infected, with higher rates of 15% morbidity among people hospitalized with the illness. According to an NCDC report from March 4
, the case fatality ratio in the latest outbreak was 23.8%.
Sixteen health workers were infected of whom four died within eight weeks of this outbreak.