Malaria parasites have a complex life cycle and different forms of the parasites can be found in the blood. This scanning electron micrograph shows red blood cells infected with the parasite: an asexual stage on the left and a mature gametocyte on the right. Only the gametocytes can infect mosquitoes.
© Brand, 2018. Image courtesy of Françoise Brand, Swiss Tropical and Public Health Institute and University of Basel. Published under a CC BY 4.0 license.