CD40LG and cytomegalovirus infection: In group R, five cases of EBV infection, one case of HBV infection, one case of cytomegalovirus infection, and one case of influenza virus infection were treated with a combination of ruxolitinib and antiviral drugs (ganciclovir and entecavir), after which these patients tested negative for antiviral IgM antibodies and their viral DNA copy numbers had decreased.