RT Book, Section A1 Vinetz, Joseph M. A1 Clain, Jérôme A1 Bounkeua, Viengngeun A1 Eastman, Richard T. A1 Fidock, David A2 Brunton, Laurence L. A2 Chabner, Bruce A. A2 Knollmann, Björn C. SR Print(0) ID 1127870308 T1 Chemotherapy of Malaria T2 Goodman & Gilman's: The Pharmacological Basis of Therapeutics, 12e YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071624428 LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=1127870308 RD 2023/09/28 AB Malaria affects about a quarter of a billion people and leads to almost 900,000 deaths annually (World Health Organization, 2009). This disease is caused by infection with single-celled protozoan parasites of the genus Plasmodium. Five Plasmodium spp. are known to infect humans: P. falciparum, P. vivax, P. ovale, P. malariae, and P. knowlesi.P. falciparum and P. vivax cause most of the malarial infections worldwide. Of these, P. falciparum accounts for the majority of the burden of malaria in sub-Saharan Africa and is associated with the most severe disease. P. vivax accounts for half of the malaria burden in South and East Asia and >80% of the malarial infections in the America. Malaria due to P. ovale and P. malariae is relatively uncommon but requires identification both for treatment (P. ovale, like P. vivax, forms hypnozoites with the potential for relapse) and for epidemiological purposes (malarial infection, due mostly to P. malariae, can arise from blood transfusion). P. knowlesi, previously thought to infect only nonhuman primates, has emerged as a zoonotic malarial parasite and now is an important, sometimes lethal, cause of human malaria in parts of Southeast Asia (including Malaysia, Indonesia, Thailand, Singapore, and the Philippines; Cox-Singh et al., 2008). P. knowlesi should therefore be considered as a potential cause of malaria among travelers returning from this region. The vast majority of malaria cases occur via infection from Anopheles mosquitoes in endemic regions. Infections acquired congenitally or via transfusions or contaminated needles are known to occur but are rare. Screening of blood donors has reduced the risk of transfusion-transmitted malaria to 1:4,000,000 in the U.S.