CD40LG and leptospirosis: For IgM ELISA, the means ± SD of OD405 were 0.269 ± 0.171 for murine typhus, 0.144 ± 0.086 for melioidosis, 0.245 ± 0.331 for leptospirosis, and 0.094 ± 0.050 for dengue sera.