A health authority reviewed records collected during one disease season. The table shows the number of people in each age band and how many developed the disease.
| Age band | Vaccinated people | Vaccinated people developing the disease | Unvaccinated people | Unvaccinated people developing the disease |
|---|---|---|---|---|
| 20–39 years | 600 | 12 | 200 | 6 |
| 60 years and over | 200 | 20 | 800 | 88 |
Calculate the percentage of people developing the disease in each vaccination group within each age band.
Explain what these results show about vaccination, and how the different age distributions of the two groups could affect a comparison of their overall disease rates.
87 exam-style questions on Edexcel GCSE Biology 5.3 Immune system and medicines, covering 5.3.1 The specific immune system, 5.3.2 Response to immunisation, 5.3.3 Advantages and disadvantages of immunisation, 5.3.4 Antibiotics and bacterial infections, 5.3.5 Aseptic techniques in culturing, 5.3.6 Cross-sectional areas of cultures, 5.3.7 Stages of developing new medicines, and 5.3.8 Production of monoclonal antibodies. Each one has a worked solution and a mark scheme showing where the marks go.