Lassa fever

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An acute, often fatal viral disease endemic to West Africa and characterized by high fever, headache, ulcers of the mucous membranes, and disturbances of the gastrointestinal tract.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun pathology An acute, and often fatal, viral infection endemic to West Africa. Symptoms include fever, sore throat, muscle aches, a skin rash, headache, abdominal pain, vomiting, diarrhoea, ulcers, heart and kidney failure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an acute contagious viral disease of central western Africa; characterized by fever and inflammation and muscular pains and difficulty swallowing; can be used as a bioweapon