Four similar-sized care homes each reviewed their antibiotic prescribing and staff hand washing. The table shows the rates recorded in each care home after the review, and the number of resistant bacterial infections in the year before and the year after the review.
| Care home | Unnecessary antibiotic prescriptions per 100 residents | Contacts followed by staff hand washing (%) | Resistant infections in the year before the review | Resistant infections in the year after the review |
|---|---|---|---|---|
| A | 5 | 96 | 20 | 6 |
| B | 5 | 58 | 20 | 12 |
| C | 18 | 96 | 20 | 11 |
| D | 18 | 58 | 20 | 24 |
Calculate the percentage decrease in resistant infections in care home A.
Explain why care home A had the greatest percentage decrease in resistant infections. Use information from the table.
71 exam-style questions on AQA GCSE Biology 6.3 The development of understanding of genetics and evolution, covering 6.3.1 Theory of evolution, 6.3.2 Speciation, 6.3.3 The understanding of genetics, 6.3.4 Evidence for evolution, 6.3.5 Fossils, 6.3.6 Extinction, and 6.3.7 Resistant bacteria. Each one has a worked solution and a mark scheme showing where the marks go.