(a) In human beings different types of malaria are caused by 4 different species of Plasmodium. They are : 1. Benign tertian malaria – Plasmodium vivax. 2. Malignant(Pernicious or cerebral) tertian malaria – Plasmodium falciparum. 3. Quartan malaria – Plasmodium malariae. 4. Mild tertian malaria – Plasmodium ovale.