Second National Communications Leptospirosis is positively associated with the volume of rainfall (r = .515, p <.01)*. The number of leptospirosis cases is high when the volume of rainfall is high. Similarly, when humidity is high, the number of Leptospirosis cases increases. 44 Graph 18. Leptospirosis Cases and Relative Humidity by Month, Philippines, 1998-2006 Leptospirosis 350 Relative Humidity 90 300 250 85 200 150 80 100 50 75 1Ja n 1- -98 M ay 1- -98 Se p1- 98 Ja n 1- -99 M ay 1- -99 Se p 1- -99 Ja n 1- -00 M ay 1- -00 Se p 1- -00 Ja n 1- -01 M ay 1- -01 Se p 1- -01 Ja n 1- -02 M ay 1- -02 Se p1- 02 Ja n 1- -03 M ay 1- -03 Se p 1- -03 Ja n 1- -04 M ay 1- -04 Se p 1- -04 Ja n 1- -05 M ay 1- -05 Se p 1- -05 Ja n 1- -06 M ay 1- -06 Se p06 0 There was no significant association found between leptospirosis and mean temperature. Climate Change Paramaters Leptospirosis r* p* Rainfall (mm/day) .515 .000 Mean Temperature (°C) -.130 .156 Relative Humidity .350 .000