One example of a parasitic protozoan is Plasmodium. Plasmodium is a type of protozoan that causes malaria in humans. It is transmitted to humans through the bite of an infected female Anopheles mosquito. Once inside the human body, the Plasmodium parasites multiply in the liver and red blood cells, causing the symptoms of malaria, such as fever, chills, and fatigue. If left untreated, malaria can lead to serious complications and even death.