A health team investigates an outbreak of an infection in one region.
For each control measure, the team compares two equal-sized communities with similar initial infection rates. The table shows the percentage by which the number of new cases was lower in the community using the control measure after the same period.
| Control measure | New cases compared with the community not using the measure |
|---|---|
| safe drinking water | 64% lower |
| improved ventilation | 5% lower |
| insecticide-treated bed nets | 3% lower |
| protective clothing when caring for patients | 6% lower |
Which pathogen is most consistent with these results?
tuberculosis bacteria
the Ebola virus
Helicobacter bacteria
the malarial protist
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.