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Herd Immunity Dynamics

Part of Vaccination and Herd Immunity — GCSE Biology

This diagram covers Herd Immunity Dynamics within Vaccination and Herd Immunity for GCSE Biology. How vaccines work, types of vaccines, population immunity, vaccination programs It is section 4 of 14 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

Topic position

Section 4 of 14

Practice

18 questions

Recall

21 flashcards

Herd Immunity Dynamics

Herd Immunity Threshold Visualization Low Vaccination (30%) Disease spreads easily High Vaccination (85%) Herd immunity achieved Legend: Vaccinated/Immune Susceptible Infected Transmission blocked Herd Immunity Threshold by Disease 100% 75% 50% 25% 0% Measles 95% Polio 85% COVID-19 75% Flu 50% Vaccination Coverage Required Herd Immunity Threshold Formula: Threshold = 1 - (1/R₀) Where R₀ = Basic reproduction number (average infections from one case) Example: Measles R₀ = 15, so threshold = 1 - (1/15) = 93.3%

Keep building this topic

Read this section alongside the surrounding pages in Vaccination and Herd Immunity. That gives you the full topic sequence instead of a single isolated revision point.

How Vaccines Work: Molecular MechanismsVaccination Programs and SchedulesEdward Jenner and the Birth of VaccinationKey Facts: Vaccination and Herd Immunity

Practice Questions for Vaccination and Herd Immunity

What do vaccines contain?

  • A. Live, active pathogens that cause disease
  • B. Dead or inactive pathogens or their antigens
  • C. Antibiotics to kill bacteria
  • D. White blood cells from another person
1 markfoundation

Explain how vaccination protects a person from getting a disease. [3 marks]

3 marksstandard

Quick Recall Flashcards

What is herd immunity?
When a sufficient proportion of a population becomes immune to an infectious disease, making it unlikely for the disease to spread from person to person.
What is a vaccine?
A preparation containing antigens that stimulates the immune system to develop immunity against specific diseases without causing the disease itself.

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How Vaccines Work: Molecular Mechanisms

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Vaccination Programs and Schedules