Download as PDF. Set alert. About this page. Malaria. Eric Scholar, in xPharm: The Comprehensive Pharmacology Reference, 2007. Introduction. Malaria is a protozoan infection of the red blood cells, transmitted by the bite of a female anopheles mosquito. Malaria is caused by the protozoa of the genus Plasmodium. There are four species that infect humans: P. vivax, P. ovale, P. malariae, and P.