Multiple choice

Which of the following statements is true about herd immunity?

  1. In herd immunity, full herd is immunised against a pathogen.

  2. In herd immunity, only some of the inhabitants are immunised and others develop immunity themselves.

  3. Herd immunity means that the whole herd is naturally immune to an infection.

  4. Herd immunity refers to the susceptibility index of the herd.
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B Correct answer
Explanation

In herd immunity, only some of the inhabitants are immunised and others develop immunity themselves. It is a form of indirect protection from infectious diseases that occurs when a large percentage of population has become immune to an infection. It provides a measure of protection for individuals who are not immune.

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