In 2018, Nigeria faced the largest recent outbreak of Lassa fever. What is Lassa Fever? Lassa fever is an acute, viral hemorrhagic illness with a duration 2 to 21 days. 1 in 5 infections result in severe disease in which the virus affects many organs, such as the kidneys, spleen, and liver. This disease occurs every year in West Africa. This illness is a zoonotic disease as the virus is transmitted from rodents to humans through contact with food or household items contaminat