CD40LG and Zika virus infectious disease: In five case-control studies, exposure to ZIKV was assessed in the mother, based on clinical symptoms of ‘suspected Zika virus infection’125, or presence of maternal antibodies measured by IgM (Kumaret al. (2016)272), PRNT (de Araujoet al. (2018)126, Subissiet al. (2018)131), or both PRNT and IgG (Moreira-Sotoet al. (2018)) maternal antibody127.