Plasmodium falciparum and Plasmodium vivax infections in Saudi Arabia, with a note on the distribution of anopheline vectors.

Variations in the intensity of Plasmodium infections were observed in the surveyed regions of Saudi Arabia. The highest incidence had been recorded from the Southern region and the lowest form the Northern and Eastern regions. The Western region, however, showed a regular and uniform occurrence of infection throughout the year. Five anopheline vectors were identified in the country.