CBSE Class 9 Answered
(a) What is the basis of Principle of Immunisation?
(b) Why majority of children in many parts of India are already immune to Hepatitis-A though they have never been vaccinated against it?
Asked by Topperlearning User | 27 Apr, 2016, 10:18: AM
Expert Answer
(a) Immune system develops a memory for a particular infection when it encounters it for the first time. So, when the next time that particular microbe enters the body, the immune system responds against it with even greater vigour.
(b) Because they are already exposed to the Hepatitis A virus through contaminated water.
Answered by | 27 Apr, 2016, 12:18: PM
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