Answer:
Malaria is caused by protozoan parasite Plasmodium, This
disease spread through the bite of an insect vector the female Anopheles
mosquito, which feeds on human blood.
Its symptoms are
(i) The main symptoms of malaria fever, headache, nausea
and muscular pain.
(ii) Each malarial attack is of 6-10 hours duration and consist
of the three stages. Malaria is spread by healthy person in following three
stages
(a) Cold stage feeling extreme cold and shivers.
(b) Hot stage high fever, faster respiration and heart beats
are increased.
(c) Sweating stage which due to pressure released by sweating,
temperature of the body goes down.
The only way to prevent malaria is to take precaution against
mosquito bites.
We can protect our self from bite of mosquitoes by the following
methods
(i) Mosquito repellent should be used to prevent mosquito
bite.
(ii) Mosquito larvae can be killed by sprinkling kerosene oil
in open drainage, water coolers or any uncovered water bodies.
(iii) One should sleep under mosquito nets.
(iv) Wire-gauze should be used on doors and windows of houses
to prevent entry of mosquitoes.
(v) Adult mosquitoes can be killed by spraying insecticides
(e.g., BHC, malathion).
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