28. What is herd immunity?

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Question restatement: 28. What is herd immunity?

Option 1: Getting protective antibodies from the animals we eat. This is not what herd immunity refers to; it describes zoonotic exposure or foodborne antibodies, not population-level immunity from vaccination or prior infection.

Option 2: The % of the population that needs to be vaccinated to limit spread of the disease. This aligns with the standard epidemiological concept of herd immunity: a threshold proportion of immune individuals in the population reduces transmission and protects those who are not immune.

Option 3: Vaccination of domesticated animals so they can't act as a reservoir of disease. While vaccination of animals can affect transmission in some contexts, herd immunity specifically describes immunity within the human population and the threshold needed to limit spread among people, not animal reservoirs.

Option 4: Vaccination of every person which is required for disease eradication. Eradication would require interrupting transmission globally, but herd immunity does not require vaccinating every person; it relies on reaching a sufficient proportion of immune individuals to disrupt transmission chains.

In summary, option 2 correctly captures the essence of herd immunity as the proportion of the population that must be immune (typically via vaccination or past infection) to reduce disease spread within the community. The other options either mischaracterize herd immunity, confuse animal reservoirs with human population immunity, or describe an unrealistic universal vaccination requirement rather than the protective threshold concept.

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28. What is herd immunity?

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Herd immunity occurs when

When you have a vaccination, who benefits?

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