how are vaccins usful to us?
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Answer:
vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way.
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A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way.
From birth, we are constantly exposed to many different viruses, bacteria and other microbes. Most are not harmful, many are beneficial but some can cause disease.
The body's immune system helps protect us against infections. When we are exposed to infection, the immune system triggers a series of responses to neutralise the microbes and limit their harmful effects. Exposure to an infectious disease often gives lifelong protection (immunity) so we do not contract the same disease again. Our immune system “remembers” the microbe.