Health workers compare two programmes for controlling Helicobacter infection in two residential hostels. The hostels contain the same number of residents, and the results are for equal six-week periods.
Neither programme was used during the first period. The programmes were introduced at the start of the second period.
| Hostel | Programme used during the second period | New infections during the first period | New infections during the second period |
|---|---|---|---|
| R | safe drinking water and handwashing facilities | 24 | 6 |
| S | insect repellent and insecticide-treated bed nets | 22 | 20 |
Evaluate which programme should be used in both hostels to reduce the transmission of Helicobacter.
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.