Scientists investigated the effect of ventilation on droplets in the air of a community hall. They released a harmless spray of droplets, similar in size to the droplets produced by coughing, and measured the mean number of droplets per litre of air 10 minutes later.
| Ventilation setting | Mean number of droplets per litre of air after 10 minutes |
|---|---|
| low | 84 |
| high | 29 |
A person with tuberculosis regularly uses the hall.
Explain how using the high ventilation setting could reduce the spread of tuberculosis to other people in the hall.
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.