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NCERT Textbook
WHY DO WE FALL ILL

Class 9
Biology :-NCERT Solution - Why Do We Fall Ill

Page No 187:
Question 4:
What is immunization?

Answer:


Immunizationis defined as protection of the body from communicable diseases by administration of some agent that mimics the microbe. This suspension of killed microbes that mimics the disease-causing microbes is known as vaccine.

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