Malaria parasites. Image 8 of 10. Coloured transmission electron micrograph (TEM) of a malarial oocyst in an infected mosquito. Many malaria (Plasmodium sp.) sporozoites (brown) are in the circular cyst, on the mosquito (Anopheles sp.) gut wall. The sporozoites are the result of asexual replication. They will burst out of the oocyst and infect humans, transmitted in the saliva of the feeding mosquito. Malaria later infects human red blood cells, causing anaemia, cyclic fevers and even death. Magnification: x1000 at 6x7cm size. For the complete malaria parasite life cycle, see images M210/207-216.