Malaria can be a fatal disease for human beings.. Approximately 300 million people around the world get infected with malaria every year. More than 2 million people die every year due to malaria disease. Malaria is caused by a protozoan parasite Plasmodium, this disease spreads through the bite of an insect vector-the female Anopheles moqutio which feeds on human blood. Male Anopheles mosquito feeds upon plant juice. Symptoms. Main symptoms of malaria include headache, nausea, muscular pain and high fever. Each malarial attack is of 6 to 10 hours duration and consists of the three stages : 1. Cold stage, feeling of extreme cold and shivers; 2. Hot stage, I.e., high fever, faster respiration and heart beat; and 3. Sweating stage, i.e., due to profuse sweating, temperature of the body goes down to normal. Even after the patient is cured of malaria, the patient feels weak and becomes anaemic. Malaria may also secondarily cause enlargement of spleen and liver. Presence of malarial parasite can be checked by blood test.