Table 2.

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

Study	Country	Timeframe	SAR
Heavey et al16	Ireland	March 2020	0
Danis et al17	France	January–February 2020	School: 0/86, community: 0/80, hospitalised: 1/6
Yung et al62	Singapore	February–March 2020	0/42
Macartney et al21	Australia, New South Wales	25 January–9 April 2020	All 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 al22	Israel	May 2020	178/1312
Heavey et al16	USA, Rhode Island	1 June–31 July 2020	n/a
Pray et al29	USA, Wisconsin	July–August 2020	115/151 (76%)
Blaisdell et al30	USA, Maine	June–August 2020	0
Lopez et al20	USA, Utah	April–July 2020	n/a
Ehrhardt et al24	Germany, Baden-Württemberg	25 May–5 August 2020	Estimation of one secondary case per roughly 25 infectious school days
Brandal et al28	Norway, Oslo and Viken counties	28 August–11 November 2020	Child 2/234 (0.9%), adult 1/58 (1.7%)
Gold et al19	USA, Georgia	1 December 2020–22 January 2021	n/a
Larosa et al27	Italy	1 September–15 October 2020	38/994 (3.82%) overall 0.38% in primary schools (1/266) 6.46% in secondary schools (37/572)
Yoon et al26	South Korea	27 February–16 March 2020	0
Yoon et al25	Korea	Up to 31 July 2020	2/≥13 100

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

n/a, not available.