Scientists studied new tuberculosis infections among workers in two large buildings over the same 12-month period. Every worker tested negative for tuberculosis at the start of the study.
| Building | Ventilation during working hours | Number of workers | Number of new tuberculosis cases |
|---|---|---|---|
| R | windows open | 600 | 6 |
| S | windows closed | 400 | 12 |
Evaluate the claim that opening the windows reduced the transmission of tuberculosis.
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.