CD40LG and Zika virus infectious disease: Of the 83 first samples that demonstrated ZIKV IgM antibodies, only 8 (1.0%) had ZIKV neutralizing antibodies (PRNT = 1:40–1:640) with 3 cases exposed to ZIKV infection confirmed using PRNT50 with ZIKV neutralizing titer ≥4fold of DENVs neutralizing titer.