The prevalence of malaria in Quetta was estimated from blood films made during malaria survey, held over 12 consecutive months. The highest parasite rate occurred during the months of August-October. Plasmodium vivax was the most common infecting species of mosquitoes during the year, while Plasmodium falciparum predominated the later transmission season. The data also reveal the slight prevalence of malaria in the male members of the family, and in the children between 1-16 years. The data pertaining to the years 1995-1998 reveal the resurgence of malaria intensity.