During an outbreak at a residential training centre, the trainees in the two groups were of similar ages and had similar exposure to the disease.
| Group | Number of trainees | Number developing the disease |
|---|---|---|
| Vaccinated | 1200 | 60 |
| Unvaccinated | 300 | 30 |
Which conclusion is supported by these results?
Vaccinated trainees had fewer cases overall and a higher disease rate.
Vaccinated trainees had more cases overall but a lower disease rate.
Vaccinated trainees had more cases overall and a higher disease rate.
Vaccinated trainees had fewer cases overall but a lower disease rate.
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.