disease.There might also be the following cases: • A child may sometimes need an additional dose of the vaccine to build immunity when the first dose fails to do the same. • A child may be exposed to the disease just before the administration of the vaccine.Thus, they may not be able to build immunity during that time and may get sick. • A child may get sick from a similar disease that the child was vaccinated against. For instance, many viruses cause flu-like symptoms but not exactly flu.The flu vaccine fails to build immunity against these different strains in such cases. 34
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