The term "herd immunity," when used to describe an influenza epidemic, refers to:

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Herd immunity refers to the situation when enough individuals in a population are immune to a disease, either through vaccination or prior infection, that the disease has a difficult time spreading. This can protect those who are not immune or those who are at higher risk for complications from the disease. In the case of an influenza epidemic, vaccination measures can protect a majority of the population and create herd immunity.

The Term "Herd Immunity," When Used to Describe an Influenza