CAIE A Level Biology 9700 · Immunity
The table below shows data from two regions (X and Y) that experienced an outbreak of the same infectious disease. Both regions have similar population sizes and initial exposure.
| Region | Percentage of population vaccinated | Number of confirmed cases after 6 months |
|---|---|---|
| X | 92% | 340 |
| Y | 55% | 24,500 |
Compare the data for the two regions and explain how vaccination programmes contribute to the control of infectious diseases.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
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