We interviewed case patients and family members and collected data on demographic, clinical, and exposure history using the Lassa fever Case Investigation Form. We collected samples and sent them to the Hemorrhagic Fever Reference Laboratory in Kenema District for polymerase chain reaction tests. Active case searches in communities and health facilities were conducted, and 58 contacts (20 Household members and 38 health workers) were line-listed and monitored for 21 days. Environmental assessment including rodent trapping was also conducted.

