During rainy seasons, periods of high malaria prevalence, 15 positive IgM for CHIKV (green bars) and three for DENV (yellow bars) in 2009, six for YFV (red bars) in 2010, six for YFV (red bars) and nine for ZIKV (blue bars) in 2011, and one RVFV (dark grey bars) in 2012, were detected among samples. The gene discussed is CD40LG; the disease is malaria.