CD40LG and measles: We first observed high anti-measles VL dIgA reactivity in the commercial panel of acute measles infection samples (test panel), which were significantly higher (Kruskal-Wallis, P < 0.0001, Welch’s t-test, P < 0.0001) than in healthy donors, acute rubella/parvovirus/dengue-infected, and measles/rubella uninfected (IgM negative) samples, comparable to IgM reactivity as measured using commercial anti-measles VL kits from Euroimmun (Fig. 1).