Lassa fever is a severe and often fatal viral hemorrhagic illness caused by Lassa virus. It is is highly contagious, and can spread rapidly. Viral haemorrhagic fevers (VHFs) are a group of illnesses caused by viruses, which include the Ebola and Marburg, Lassa fever, and Yellow fever and Dengue fever viruses. VHFs have several similar features: They affect many organs They damage the blood vessels causing hemorrhage (bleeding) They impair the body’s ability to regulate itself Learn simple ways to stop the spread of Lassa Fever