Chlamydia is a sexually transmitted infection (STI).
The Table shows the number of cases of chlamydia diagnosed in one year in different age groups.
Table
| Age group in years | Number of cases diagnosed per 100 000 people |
|---|---|
| 15 to 19 | 1800 |
| 20 to 24 | 2100 |
| 25 to 34 | 700 |
| 35 to 44 | 200 |
Name the type of pathogen that causes chlamydia.
Calculate how many times greater the number of cases is in the 20 to 24 age group than in the 35 to 44 age group.
Explain how chlamydia is spread from one person to another.
Explain why using a condom reduces the spread of chlamydia.
Give one other way the spread of chlamydia can be reduced.
43 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.