CD40LG and viral infectious disease: Similar hepatitis studies based on yellow fever surveillance reported variable results: HBsAg (10.6%), HCV IgG/IgM (2.0%), and HEV IgM (16.9%) in Chad, 2019 [29]; HBsAg (19.8%), HCV Ag/IgG/IgM (5.6%), and HEV qPCR (13.6%) among cases randomly selected from surveillance between 2008 and 2010 in the Central African Republic (CAR) [7].