A workplace introduces an influenza vaccination programme between two winters. Each winter is monitored for the same length of time.
| Winter before the programme | Winter after the programme | |
|---|---|---|
| Number of employees | 2800 | 3400 |
| Number of influenza cases | 224 | 153 |
Calculate the percentage decrease in the rate of influenza cases per 1000 employees between the two winters.
112 exam-style questions on Edexcel GCSE Biology 5.1 Health and communicable disease, covering 5.1.1 Communicable and non-communicable diseases, 5.1.2 Disease susceptibility interactions, 5.1.3 Pathogens as disease-causing organisms, 5.1.4 Common infections, 5.1.5 Spread and prevention of pathogens, 5.1.6 Lifecycle of a virus, and 5.1.7 Spread and prevention of STIs. Each one has a worked solution and a mark scheme showing where the marks go.