Because the malarial parasite reproduces sexually in mosquitos, the mosquito is said to be the definitive host for the parasite, and we humans, the intermediate host. Although we commonly think of the mosquito transmitting the infection to us, we actually transmit the infection to the mosquitos. All reproduction carried out by malarial parasites in the human body is asexual in nature. These unite to form an organism capable of infecting the mosquito. When mature, the sporozoites migrate to the mosquito's mouthparts, ready to be injected into the next human host.
Malaria is an important disease worldwide and is one of the top infectious killers.
And all in under 30 seconds. In the days of the British occupation of India, malaria was a big problem to the colonists. To make the medicine more palatable, people used to mix it with Gin, and so the Gin and Tonic was born. Malaria continues to be a problem because of its tendency to develop resistance to new drugs. In fact these resistances may develop so fast that drug-resistant strains may already be present by the time a drug is ready to go on the market.