Consider the following statements about the Herd Immunity It can be achieved only when hundred perce...........

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Consider the following statements about the Herd Immunity

It can be achieved only when hundred percent of the population becomes immune to a disease.
It cannot be achieved through vaccination.

Select the correct statement.

1 only

2 only

Both

None

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Explanation:

Both statements are incorrect.
Herd immunity happens when so many people in a community become immune to an infectious disease that it stops the disease from spreading. This can happen in two ways:

Many people contract the disease and in time build up an immune response to it (natural immunity).
Many people are vaccinated against the disease to achieve immunity.

The percentage of people who need to have antibodies in order to achieve herd immunity against a particular disease varies with each disease. For example, herd immunity against measles requires about 95% of a population to be vaccinated. The remaining 5% will be protected by the fact that measles will not spread among those who are vaccinated. For polio, the threshold is about 80%.

Hence option 4th is correct.