Malaria was once known as a deadliest disease throughout the world.in ancient times when there were no facility for disease diagnosis people named it as an air borne diseases that arise from foul smelling marshes, as malaria is an italic word that means bad air. Still it is a major cause of morbidity throughout the world. Thanks to modern diagnosis facilities we know now that the culprit is a tiny animal that cannot be seen with naked eye. Yes it is microscopic protozoan Plasmodium that is carried to human by a vector mosquito who feeds upon blood of human. 5 species of plasmodium are involved in causing malaria in human named as Plasmodium.falciparum, P. vivax, P. ovale , P. malariae and P. knowlesi which basically infect primates but can infect human.