Table 4.

Secondary attack rates of SARS-CoV-2 infection by educational setting and testing approach

		Secondary attack
All settings, all contacts, including single ECEC outbreak		1·2% (18/1448)
All settings, all contacts, excluding single ECEC outbreak*		0·4% (5/1411)
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)
All settings, all staff member case to child contacts		1·5% (8/536)
All settings, all staff member case to staff member contacts		4·4% (7/160)
All settings, all staff member case to child contact, excluding single ECEC outbreak*		0·2% (1/511)
All settings, all staff member case to staff member contacts, excluding single ECEC outbreak*		0·7% (1/148)
All settings, tested population		2·8% (18/633)
All settings, tested population, excluding single ECEC outbreak		0·8% (5/598)
All schools, all contacts		0·5% (5/914)
All schools, tested population		1·3% (5/375)
Single ECEC outbreak,* all contacts		35·1% (13/37)
	Child close contacts	28·0% (7/25)
	Staff close contacts	50·0% (6/12)

Data are rate % (n/N). SARS-CoV-2=severe acute respiratory syndrome coronavirus 2. ECEC=early childhood education and care.

^*This outbreak resulted in at least four generations of infection and there was no evidence of child to child or child to staff transmission (unpublished).