Falciparum malaria is the most severe form of malaria, caused by Plasmodium falciparum, with severe constitutional symptoms and sometimes causing death. P. falciparum alone is capable of causing three types of malaria, viz., quotidian malaria, which attacks almost daily, malignant tertian malaria, which occurs every 48 hours, but is very severe and often fatal; and irregular malaria. This species is found only in the tropical region. Cerebral malaria is the most severe neurological complication of the infection.