CD40LG and Zika virus infectious disease: A false-positive dengue NS1 Ag test in a traveler with ZIKV infection was previously reported.25 In our study, at the median duration of 3 days of illness, we found no positive dengue NS1 Ag or anti-dengue IgM in any patients with ZIKV disease in both children and adults, although 36% had positive anti-dengue IgG.