CD40LG and arbovirus infection: Of the suspected arboviral disease cases, 39,717 (55.5%, 11.3 cases per 1,000 population) were ZIKV disease cases: 36,390 (91.9%) were confirmed ZIKV disease cases, including 36,177 that were positive by RT-PCR in serum, 212 in urine only, and one in CSF only; and 3,327 (8.3%) were probable ZIKV disease cases, including 344 (10.3%) that tested positive by both anti-ZIKV and anti-DENV IgM ELISA.