A sexual health clinic introduces a partner-notification programme. When a person has a positive chlamydia test, the clinic asks them to inform recent sexual partners that they may have been exposed to the infection.
The table shows the number of new positive test results recorded during two periods of equal length.
| Period | Number of new positive test results |
|---|---|
| Before the programme | 92 |
| After the programme | 68 |
Calculate the decrease in the number of new positive test results after the programme was introduced.
The number of people infected with chlamydia may be greater than the number of positive test results recorded.
Give one reason why.
Explain how partner notification can reduce the spread of chlamydia.
State one method used during sexual contact to reduce the transmission of chlamydia.
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.