CD40LG and arbovirus infection: In addition to the laboratory-confirmed dengue cases, 33 other arbovirus infections (OAI) were diagnosed as follows: acute Chikungunya infection (positive CHIKV RT-qPCR, n = 12; CHIKV-specific IgM seroconversion, n = 1), acute dengue and Chikungunya coinfection (n = 1), recent infection by Chikungunya (n = 1), recent infection by Chikungunya and dengue (n = 1), and recent infection by a flavivirus (n = 17) (S1 Table).