Herd immunity occurs when

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The question asks: Herd immunity occurs when

Option a: 'you have a vaccination against herd disease' — This is a misconception. Herd immunity is not about possessing a single vaccination against a disease; it's about the level of immunity in the whole population. Having a vaccine for some disease does not by itself define herd immunity, and the wording implies a personal vaccination rather than population-level protection.

Option b: 'a sufficient proportion of the community becomes immunised against contagious disease, so as to contain the spread of disease' — This is the correct concept. Herd immunity arises when enough people are immune (through vaccination or previous infection) that the pathogen struggles to spread, reducing transmission and protecting those who are not immune.

Option c: 'you hear a story about immunity' — This is clearly unrelated to the biological or epidemiological meaning of herd immunity. It confuses anecdotal information with scientific concepts and has no relation to disease dynamics.

Option d: 'a herd of elephants is immunised against disease' — This humorously misuses the word 'herd' and applies it to animals in a non-human context. Herd immunity is a population-level concept in human communities (and some animal populations), but the statement is not describing the epidemiological mechanism relevant to humans and uses an inapplicable example.

In summary, option b accurately captures the population-wide threshold concept of herd immunity, while the other options either misinterpret the idea as an individual action, confuse anecdotal information, or apply the term inappropriately.

MUF0061 Economics Unit 1 - Semester 1, 2025 Herd Immunity Image Analysis and Questions (5 - 7 minutes)

Herd immunity occurs when

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28. What is herd immunity?

Herd immunity occurs when

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