"Figure 2: Percentage of secondary school pupils and staff testing positive for current COVID-19 infection across Rounds 1, 2 and 4","" "England, 3 to 19 November 2020 (Round 1), 2 to 10 December 2020 (Round 2), and 15 to 31 March 2021 (Round 4)","" "","" "Notes","1. In order to ensure consistent comparisons only the 11 local authorities with coverage in rounds 1, 2 and 4, with at least two primary and two secondary schools in the sample are included in the total figures provided. These are not necessarily the same schools or participants tested between rounds. 2. Test results are only available for those who had enrolled in the survey and present in the school building on the day of testing; under current guidance you would expect these participants to have no reported COVID-19 symptoms and not be under current self-isolation guidance. 3. Estimates have been weighted and are representative of the ethnicity, gender and age for all pupils and staff in the sampled local authorities. 4. Staff includes all employees working in the school for example, teachers, teaching assistants, support staff. 5. All results are provisional and subject to revision." "Unit","%" "","" "","% positive for current infection","Lower 95% confidence interval","Upper 95% confidence interval" "Secondary pupils - round 1","1.42","0.69","2.59" "Secondary pupils - round 2","1.22","0.60","2.20" "Secondary pupils - round 4","0.33","0.13","0.67" "","% positive for current infection","Lower 95% confidence interval","Upper 95% confidence interval" "Secondary staff - round 1","1.36","0.85","2.07" "Secondary staff - round 2","1.64","1.10","2.33" "Secondary staff - round 4","0.32","0.10","0.76"