Malaria is caused by a protozoan called a malarial parasite.
It spreads by the bite of the female Anopheles mosquito which carries the malarial parasite in its salivary glands. When a mosquito bites a healthy person, the malarial parasites get transferred to the blood of a healthy person and cause malaria.
Symptoms include-
The person gets a sudden high fever with chills and sweating.
The fever subsides after some time and comes again after a gap of 24 or 48 hours.
The person goes through the cold stage, hot stage, and sweating stage.