<prompt> Answer this question truthfullyWhat is the natural progression of Lassa Fever, including its complications and prognosis?  <response>: <reason> Infected patients remain asymptomatic for 3 to 21 days following exposure. The majority of patients experience no or mild symptoms. Only a minority approximately 15-20 of patients experience multiorgan dysfunction, and typically 5-15 of infected patients die of Lassa fever. Patients typically first develop persistent high-grade fever 39 C to 41 C and other non-specific symptoms, such as muscle aches, conjunctival injection, headache, sore throat, nausea, and vomiting. If left untreated, the majority of patients self-resolve without any intervention. In a minority of cases, patients may develop worsening abdominalchest pain, temporarypermanent deafness, facial edema, mucosal bleeding and hemorrhage, pulmonary edema, pleuralpericardial effusions or ascites, multi-organ failure, and shock. Prolonged and worsening symptoms are usually associated with worsening prognosis, typically resulting in convulsions, encephalitis, seizures, coma and finally death.The following table demonstrates the 4 clinical stages of Lassa fever adapted from McCarthy et al. 2002 and Richmond et al. 2003 