Aetiology of Malaria Infection


Malaria is caused by protozoan parasite of the genus Plasmodium (phylum, Apicomplexa). In humans it is caused by P. falciparum, P malariae, P. ovale, P. vivax and P .knowlesi (Mueller et al., 2007 and Singh et al., 2004). P. falciparum is the most common cause of infection and is responsible for about 80% of all the malaria cases and about 90% of the deaths from the disease (Mendis et al., 2001).
 
Parasitic Plasmodium species also infect birds, reptiles, monkeys chimpanzees and rodents (Escalante and Ayala, 1994). There have been documented human infections with several Simian malaria species namely P.knowlesi, P. inui, P. cynomolgi, P. simiovale, P. brazillinum, P. schetzi and P. simium  (Garnham, 1996). However, with the exception of  P. knowlesi, these are mostly of limited public health importance. 
Although avian malaria can kill chickens and turkeys, it does not cause serious economic losses to poultry farmers.  Ever since it was accidentally introduced by humans it has decimated the endemic birds of Hawaii which lack resistance to it (Atkison et al., 1995).

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