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f. Proper and sufficient food

g. Proper immunization- The precautions to be taken at school to reduce

the incidence of infectious diseases are - drinking clean water,
availability of proper food, proper ventilation and to stay away from an

infected person.

2. Specific method
It involves the prevention method directed against a particular disease.

It is done by immunisation which is the process of introducing a weakened

pathogen inside the body of the host to make his/her immune system to produce
antibodies against that particular disease so that the next time, even if the

disease strikes the host’s body with full vigour, the body is able to protect itself

with the help of these antibodies.
What is the Immune System?

 The immune system is a network of cells, tissues and organs that work together in
order to protect our body from diseases. The immune system is considered as a

defence system of our body.

 The immune system looks out and destroys the disease-causing germs in our body
with the help of special cells called white blood cells. These cells are present in the

blood and hence circulate throughout the body and monitor it.
 The germs or any foreign substance that enter our body are called Antigens. As the

immune system recognizes these antigens, it releases antibodies which lock the

antigens and then destroy them with the help of other cells.
 The ability of a body to resist a disease with the help of antibodies is called

Immunity.

A Specific Method to Strengthen the Immune System
 A specific method to strengthen the immune system and hence preventing disease

is vaccination.

 Whenever our body is affected by a disease, our immune system not only fights
against it but also remembers how to respond when the same disease-causing

microbes affect our body the next time.
 Antibody provoking agents are termed vaccines. They containweakened or dead

pathogens. As they enter our body, our immune system learns to fight against them