JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY JOSE ANTONIO PENAS / SCIENCE PHOTO LIBRARY
Malaria parasite life cycle, illustration. Diagram showing the life cycle of the Plasmodium parasite that causes malaria in humans. At top left is a female mosquito laying her eggs. The sporozoite stage of the parasite is injected into humans by a mosquito (upper left). The trophozoite and merozoite stages develop and form inside red blood cells (erythrocytes) in an asexual reproduction cycle (lower right), causing anaemia and periodic fevers in the host. The sexual reproduction cycle of Plasmodium occurs in the mosquito's salivary glands (lower left), when it is taken up again by a mosquito feeding on the human host. The gametocytes are labelled with male and female symbols. One of the parasite's reproductive stages occurs in the hosts' liver cells (liver shown at upper centre).
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