The ileriaparvais a protozoan emo-parasite affecting sub-Saharan Bostaurusand Bosindicuspopulations. It is the causative agent of East Coast Fever, a major cattle disease causing the death of ~1.1∙106 animals per year and an annual loss of ~168∙106USD (Norvalet. al., 1992). T. parvageographical occurrence is bound to the presence of susceptible bovine host populations, the main tick vector Rhipicephalusappendiculatus(Neumann 1901), as well assuitable ecological conditions for the survival of both the vector and the parasite. While tick habitat requirements have been extensively investigated (see e.g. Cumming, 2002), studies focusing solely on the environmental conditions determining the parasite occurrence are still lacking.