Vaccines are medicines that train our immune system to fight specific germs. They contain dead or weak germs that help the body recognize and attack real infections if they enter in the future. Class 8 Science Grade 8 Chapter 3 Health: ...
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Vaccines are medicines that train our immune system to fight specific germs. They contain dead or weak germs that help the body recognize and attack real infections if they enter in the future. Class 8 Science Grade 8 Chapter 3 Health: ...