Screening groups and results
| Date of screening | Screening tranche | Contacts screened | Number screened | Number positive | Positives (%) |
| March 2009 | 1 | Close friends of 13-year-old | 9 | 2 | 18 |
| 1 | Close friends of 16-year-old | 7 | 1 | 14 | |
| 1 | Girls’ tutor | 1 | 0 | 0 | |
| March 2009 | 2 | Year group for 13-year-old | 25 | 3 | 12 |
| 2 | Tutor group of 13- and 16-year-olds | 27 | 3 | 11 | |
| 2 | Teachers of 13-year-old | 10 | 5 | 50 | |
| 2 | Other teachers for the year group 9 and 11 | 6 | 0 | 0 | |
| April 2009 | 3 | Year group of 16-year-old | 60 | 8 | 13 |
| 3 | Teachers who taught the two girls in last academic year | 2 | 0 | 0 |