Plasmodium species causes malaria in humans. It is also called as a malaria parasite. Its life cycle involves two hosts, mosquitoes and humans. Mosquitoes get malaria from biting a human who has malaria. The mosquito draws the blood into its stomach where malaria parasites breed and infect other red blood cells. Humans get malaria from a bite by an infected mosquito. This bite injects malaria-causing parasites into your blood, where they travel to liver cells. In the liver cells, the parasites breed. The interaction between Plasmodium and its host is parasitism. Plasmodium takes nutrition from the host and harm them. Therefore, Plasmodium is a parasite.