Class 9 Biology Why Do We Fall Ill Vaccination


Vaccine is a biological preparation that resembles a disease causing microbe.

Vaccination is the process in which vaccine is given to improve the immunity of the body against a specific disease. Vaccination are available for diseases like tetanus, diptheria, whooping cough, measles, polio, chicken pox, etc.

The microbe injected into the body through vaccination is a dead or a weak microbe and hence does not affect the body. Therefore the immune system is able to manage.

But at the same time the immune syatem also recognizes the microbe and the ways to fight it back.

When the same microbe comes to affect the body next time then the immune system recognizes it and fights back thereby prevents us from getting sick.

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