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Important Communicable Diseases Symptoms and Prevention – CBSE Class 9 Science

Communicable Diseases Symptoms and Prevention - CBSE Class 9 Science

Communicable Diseases Symptoms and Prevention – CBSE Class 9 Science

In this article, we will discuss the topic ‘Communicable Diseases Symptoms and Prevention‘, from the Chapter 5 – Why do we fall ill out for Class 9 Science.
Communicable diseases are those which get transferred from one person to another or one animal to a person or another animal by means of any contamination.
Communicable Diseases are :-
Malaria
  • Malaria is insect-borne disease and caused by a parasitic protozoan,
  • Plasmodium completes its life cycle in two hosts, man, and female Anopheles mosquito
  • It is transmitted from person to person by the bite of the insect vector, the female Anopheles 
  • When a mosquito bites an infected person, the protozoa are sucked into the stomach of insect along with the blood and breed there.
  • These parasites complete their life-cycle when they enter the red blood corpuscles in man and destroy them.

Symptoms
  • High fever, headache, body ache, nausea, and shivering are some of the symptoms of malaria.
  • Each malarial attack lasts for 6-10 hours and consists of the cold stage (shivering), hot stage (fever) and sweating stage (temperature goes down to normal).

Prevention
  • Efforts must be made to prevent mosquitoes from biting and also prevent them from Breeding
  • Following are some such methods:
  • Use wire mesh on doors and windows to prevent entry of mosquitoes into the house
  • Use mosquito repellents to prevent mosquito bites
  • Spray kerosene on stagnant water bodies or introduce fishes that feed on mosquito larva into the water bodies, so that the larvae are killed
  • Example of larvae eating fishes: Gambusia, Minnows, Trouts
  • Spray insecticides like Malathion, BHC
  • Clean tanks and sumps regularly
  • Do not allow rainwater to collect and stagnate in the garden

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