Figure 2.

Overview of included COVID-19 contact tracings in schools, Oslo and Viken counties, Norway, 28 August–11 November 2020 (n = 13)

COVID-19: coronavirus disease.

^a Schools were closed due to autumn break in week 40 (28 September–2 October 2020).

^b The first saliva samples were taken from the index case twice, with 3 days between the two; the second of these was positive. There were 6 days between the original nasopharyngeal sample and the first positive saliva sample. The third and last saliva sample was taken at the end of the case’s 10-day quarantine.

^c One or two primary cases (school contacts who tested positive for SARS-CoV-2 in the first saliva sample) were detected in the contact tracing.