Lassa fever claims life of Iowa resident returning from West Africa

Lassa fever is a viral illness caused by the Lassa virus, primarily spread by the Mastomys natalensis rat in West Africa. A recent case in Iowa resulted in the death of a resident returning from the region, highlighting the disease's risks. Symptoms of Lassa fever start with fever and weakness, progressing to headaches, sore throat, and gastrointestinal issues. Severe cases can lead to bleeding and low blood pressure. The incubation period is 6 to 21 days, with severe outcomes possible, especially in late pregnancy. Currently, there is no specific treatment for Lassa fever, though research is ongoing to develop potential vaccines. The disease has a case fatality rate of about 1%, increasing to 15% for severe cases.