A disease spreads through contact between people. Two districts have similar population sizes and similar amounts of contact between people. The table shows the percentage of residents in each district who are immune to the disease.
| District | Residents who are immune (%) |
|---|---|
| North | 88 |
| South | 54 |
Explain which district is more likely to have onward transmission of the disease and how high immunity can protect people who cannot be vaccinated.
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.