CD40LG and leptospirosis: Association analysis using leptospirosis IgM positivity recorded by the Health Ministry for 2011–2014 from Site 1 and monthly rainfall showed that 30.9% of positive sample variation could be explained by rainfall in the same month (R22011-2014 = 0.309, CI: 0.027–0.545, p-value = 0.032).