Researchers studied the spread of a communicable disease in populations with different levels of vaccination coverage.
| Population vaccinated (%) | Average number of new infections caused by each case |
|---|---|
| 20 | 3.4 |
| 45 | 2.1 |
| 70 | 1.3 |
| 90 | 0.7 |
Which conclusion is supported by the data?
Coverage of 90% is still too low for each case to cause fewer than one new infection on average.
The average number of new infections caused by each case falls as vaccination coverage rises.
At 70% coverage, the number of cases in the outbreak falls over time.
Raising coverage from 70% to 90% lowers new infections per case more than raising it from 20% to 45%.
181 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.