training module for medical officers primary health centre - NVBDCP

2.2: MORPHOLOGY, LIFE CYCLE AND TRANSMISSION OF MALARIAL PARASITELife Cycle of the Malarial ParasiteThe malarial parasite undergoes 2 cycles of development – the human cycle (asexual cycle) and themosquito cycle (sexual cycle). Man is the intermediate host and mosquito the definitive host.Figure 2.1. Life Cycle of Plasmodium species in man and the mosquitoAsexual cycle in human beingThe asexual cycle begins when an infected anopheles mosquito bites a person and injects sporozoites.There are 3 phases in the human cycle.10