While IL-10 has remained the main focus of studies examining immune-regulation in LF and other infectious diseases, it is also known that IL-10 belongs to a superfamily of cytokines that consist of 9 members – IL-10, IL-19, IL-20, IL-22, IL-24, IL-26 and the more distantly related IL-28A, IL-28B and IL-29 [12], [13]. This evidence concerns the gene IL10 and Lassa fever.