Table 2.

Characteristics of cohort studies (N = 5)

Study	No. schools	Type of schools	Size of schools	Non-pharmaceutical interventions (school)	School cluster outbreak (Yes/ No)	Sampling method	Provider testing/ self-testing	Testing method	Follow-up modality	Follow-up frequency	No. index case	Type of Index case	Age	Gender	Contacts (N)	Secondary infected cases (n)	IAR (%)
Danis 2020 [17]	3	NA	NA	school closed	No	nasopharyngeal swabs; endotracheal aspirates	NA	real- time RT-PCR	telephone call	daily	1	pupil	9	NA	102	0	0.00
Heavey 2020 [18]	NA	NA	NA	NA	No	NA	NA	NA	NA	daily	6	3 pupils; 1 staff; 2 adult visitors	pupils: 10-15; staff: >18	NA	1155	2*	0.17
Yung 2020 [19]	3	2 preschools; 1 secondary school	NA	terminal cleaning of schools; suspension of extracurricular, sport activities; staggered recess breaks	No	nasopharyngeal swabs	provider testing	real- time RT-PCR	NA	NA	3	2 pupils; 1 staff	pupils: 5, 12; staff: >18	NA	119	0	0.00
NCIRS 2020 [20]	6	3 primary school; 2 high school; 1 ECEC	NA	NA	No	nasopharyngeal swabs; serum samples	provider testing	nucleic acid testing; SARS-CoV-2 antibody testing	NA	NA	6	4 pupils; 2 staff	pupils: <18; staff: >18	NA	521	0	0.00
Macartney 2020 [21]	25	15 primary and secondary school; 10 ECEC	NA	NA	Yes	nasopharyngeal swabs; serum samples	provider testing	nucleic acid testing; SARS-CoV-2 antibody testing	text message; telephone call	NA	27	12 pupils; 15 staff	pupils: 14 (1-18) †; staff: 38 (19-65)†	pupils: 6 male, 6 female; staff: 1 male, 14 female	1448	18	1.24

ECEC – early childhood education and care setting, IAR – infection attack rate, NA – not available

*In other transmission settings (household, recreactional activities), except school settings.

†Median (range).