Lassa fever is a zoonotic hemorrhagic disease that is endemic in many parts of West Africa, with frequent outbreaks in Sierra Leone. From 2019  to date, several cases and outbreaks of Lass fever have been reported from several districts where no case was detected before. However, there has been limited information on the burden, epidemiological patterns, and risk population groups for Lassa fever infection. This study aimed to describe the burden, distribution, and epidemiological trends of Lassa fever in Sierra Leone. 

