Epidemiology of Lassa Fever and Factors Associated with Deaths, Bauchi State, Nigeria, 2015-2018.

We report the epidemiology of Lassa fever in Bauchi State, a disease-endemic region, in Nigeria. Since 2015, major increases in Lassa fever attack rate and in the case-fatality rate have occurred in this state. A delay in seeking care by a case-patient for >7 days after symptom onset was the major predictor of death.