Term
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Definition
| using an antigen that has been made harmless to produce and immune response and memory cells |
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Term
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Definition
| lymphocytes remaining after a first exposure to a pathogen, allowing rapid response to second infection |
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Term
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Definition
| substances added to a vaccine to make it more effective |
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Term
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Definition
| principle by which many vaccinated individuals protect those unvaccinated |
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Term
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Definition
| the percentage of a population that must be vaccinated to achieve herd immunity |
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Term
| disease, vaccine effectiveness, density of population |
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Definition
| factors that affect the herd immunity threshold |
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Term
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Definition
| barrier to achieving herd immunity in developing country |
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Term
| rejection of the vaccine on offer |
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Definition
| barrier to achieving herd immunity in developed country |
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Term
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Definition
| when a pathogen changes its antigen |
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Term
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Definition
| viral infection that undergoes antigen variation and so requires annual vaccination programme |
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