Abbreviations: WBC - white blood cells; RBC - red blood cells; MRSA - methicillin-resistant Staphylococcus aureus; Hep - hepatitis; Ag - antigen; Ab - antibody; IgM - immunoglobulin M; IgG - immunoglobulin G; HIV - human immunodeficiency virus; CMV - cytomegalovirus; EBV - Epstein-Barr virus; VCA - viral capsid antigen; DNA - deoxyribonucleic acid. Here, CD40LG is linked to hepatitis A virus infection.