CD40LG and measles: A panel of 239 sera was assembled that included 50 pooled specimens from confirmed cases of measles and 189 sera that were IgM positive for a number of other viruses (chikungunya, dengue, HHV-6 [roseola], parvovirus B19, rubella, Zika) or presented with fever and rash of unknown etiology (the “non-measles” panel) (Table 1).