"Figure 2: Percentage of primary and secondary school pupils testing positive for current COVID-19 infection","" "England, 3 to 20 November 2020 (Round 1), 30 November to 11 December 2020 (Round 2), 15 to 31 March 2021 (Round 4) and 5 to 21 May 2021 (Round 5)","" "","" "Notes","1. To ensure consistent comparisons between rounds, only the 11 local authorities with coverage in Rounds 1, 2, 4 and 5 for 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 self-isolation. 3. The number of positive test results in Round 4 from primary school pupils are too small to present because of [statistical disclosure criteria](https://www.ons.gov.uk/methodology/methodologytopicsandstatisticalconcepts/disclosurecontrol/policyforsocialsurveymicrodata). 4. Estimates have been weighted and are representative of the ethnicity, gender, and age for all pupils in the sampled local authorities. " "Unit","%" "","" ""," %positive for current infection","Lower 95% confidence interval","Upper 95% confidence interval" "Primary school pupils Round 1","0.76","0.27","1.68" "Primary school pupils Round 2","0.94","0.44","1.76" "Primary school pupils Round 4","undefined","undefined","undefined" "Primary school pupils Round 5","0.36","0.08","1.01" "Secondary school pupils Round 1","1.42","0.69","2.59" "Secondary school pupils Round 2","1.22","0.6","2.2" "Secondary school pupils Round 4","0.33","0.13","0.67" "Secondary school pupils Round 5","0.04","0","0.23"