NCERT Solutions for Class 9 Science Chapter 13
Important NCERT Questions
Why Do We Fall Ill
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-187
Questions No-4
What is immunization?
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Introduction of mild type of infection (microbes) or killed infectious microbes into the body by
vaccination / by other means to activate the immune system against a particular infection / disease is called immunization.
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