Vaccination and herd immunity

GCSE · Biology · OCR · B6 — Global challenges — biotechnology, GM crops, monoclonal antibodies, gene therapy, disease (communicable + non-communicable), drug development

Question

OCR J257/02 — Short answer

(a) Explain how a vaccine gives a person immunity to a disease. [4 marks]

(b) Explain the concept of herd immunity and why it is important for people who cannot be vaccinated. [3 marks]

(c) During a measles outbreak in a community where 70% of people are vaccinated, the disease spreads more slowly than in a community where only 40% are vaccinated. Explain this observation. [2 marks]

9 marks · take your time before peeking.

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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.