malaria:

An infectious disease that is characterized by severe chills and fever. It is caused by parasitic protozoa in red blood corpuscles that are transmitted to humans by the bite of an infected anopheles mosquito. 

A disease caused by infection with one or more of four different protozoans and marked by recurring fevers, prostration, and sometimes death. The protozoa are spread from one infected person to another by the bite of Anopheles mosquitoes and, rarely, via blood transfusion. 

A disease caused by the presence of the sporozoan Plasmodium in human or other vertebrate red blood cells, usually transmitted to humans by the bite of an infected female mosquito of the genus Anopheles that previously sucked the blood from a person with malaria. Human infection begins with the exoerythrocytic cycle in liver parenchyma cells, followed by a series of erythrocytic schizogenous cycles repeated at regular intervals; production of gametocytes in other red cells provides future gametes for another mosquito infection; characterized by episodic severe chills and high fever, prostration, occasionally fatal termination (Dirckx, 1997). 

An infectious disease caused by parasitic microorganisms called plasmodia. Malaria can be spread among humans through the sting of certain types of mosquitos (Anopheles) or by a contaminated needle or transfusion. Malaria is a major health problem in the tropics and subtropics, affecting over 200 million people world wide.