We examined a serological panel of confirmed measles infection (anti-measles IgM positives, n = 50) and non-measles infection with rubella (n = 36), roseola (n = 40), chikungunya/dengue/zika (n = 41), parvovirus (n = 35), and other fever-rash illnesses of unknown cause (n = 37). The gene discussed is CD40LG; the disease is dengue disease.