IgM-positive samples underwent RT-PCR confirmation with genotype assignment through sequence comparison against GenBank reference strains.<h4>Results</h4>Overall IgM seropositivity indicating recent infection was 86.8% (756/871), with DENV most prevalent (59.6%; 95% CI: 56.3-62.8%), followed by CHIKV (49.4%), YFV (48.3%), ZIKV (19.7%), WNV (3.4%), and RVFV (2.3%). Here, CD40LG is linked to infection.