BRAINCAKEHerd Immunity
When enough of a population have immunity to a disease the pathogen is unlikely to spread within the population because the population has herd immunity.
Vaccination of 80 - 95% of the population will achieve herd immunity. The percentage of the population needed to achieve herd immunity depends on the nature of the pathogen.
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Key terms in this lesson
- pathogen
- A microorganism, such as a virus, bacterium, fungus or protoctist, that causes disease.
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All 30 lessons in Cell Recognition and the Immune System · All AQA AS-level Biology topics