Table 2

Studies that assessed the secondary attack rate (SAR)*, when children are the index case within educational settings

StudyCountryTimeframeSAR
Heavey et al16IrelandMarch 20200
Danis et al17FranceJanuary–February 2020School: 0/86, community: 0/80, hospitalised: 1/6
Yung et al62SingaporeFebruary–March 20200/42
Macartney et al21Australia, New South Wales25 January–9 April 2020All settings, all child case to child contacts 0.3% (2/649)
All settings, all child case to staff member contacts 1.0% (1/103),
Child close contacts 28.0% (7/25)
Stein-Zamir et al22IsraelMay 2020178/1312
Heavey et al16USA, Rhode Island1 June–31 July 2020n/a
Pray et al29USA, WisconsinJuly–August 2020115/151 (76%)
Blaisdell et al30USA, MaineJune–August 20200
Lopez et al20USA, UtahApril–July 2020n/a
Ehrhardt et al24Germany, Baden-Württemberg25 May–5 August 2020Estimation of one secondary case per roughly 25 infectious school days
Brandal et al28Norway, Oslo and Viken counties28 August–11 November 2020Child 2/234 (0.9%), adult 1/58 (1.7%)
Gold et al19USA, Georgia1 December 2020–22 January 2021n/a
Larosa et al27Italy1 September–15 October 202038/994 (3.82%) overall
0.38% in primary schools (1/266)
6.46% in secondary schools (37/572)
Yoon et al26South Korea27 February–16 March 20200
Yoon et al25KoreaUp to 31 July 20202/≥13 100

  • *The extracted SAR based on the original definition given by the authors in each study.

  • n/a, not available.