Malaria is transmitted from human to human via mosquito bites. The malaria parasite, Plasmodium, grows in the human liver and spreads to the bloodstream when transmitted via mosquito bites. There are four main species of Plasmodium parasites that cause malaria in humans. The parasite's lifecycle involves multiplication in the liver and red blood cells, causing symptoms like fever, chills, and nausea. Malaria spreads through mosquito bites and can be prevented by reducing standing water where mosquitoes breed.