. 2021 Nov 4;26(44):2100977. doi: 10.2807/1560-7917.ES.2021.26.44.2100977

Table 3. Secondary attack rate of SARS-CoV-2 infection by vaccination status of the index case (≥ 12 years) and vaccine effectiveness against transmission, the Netherlands, August–September 2021 (n = 4,921 index cases).

Analysis	Unvaccinated index			Partly vaccinated index					Fully vaccinated index
	SAR			SAR			Crude VET	Adjusted VET^a	SAR			Crude VET	Adjusted VET^a
	Positive	Total	%	Positive	Total	%	% (95% CI)	% (95% CI)	Positive	Total	%	% (95% CI)	% (95% CI)
Unvaccinated household contacts	547	2,517	22	21	121	17	28 (−18 to 56)	38 (−2 to 62)	38	303	13	50 (28 to 65)	63 (46 to 75)
Fully vaccinated household contacts	164	1,505	11	37	614	6	46 (22 to 63)	46 (20 to 63)	256	2,070	12	−16 (−44 to 6)	40 (20 to 54)

CI: confidence interval; SAR: secondary attack rate; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2, VET: vaccine effectiveness against transmission.

^a Adjusted for age group of the index case and contact and for week of notification of the index case.

Table 3. Secondary attack rate of SARS-CoV-2 infection by vaccination status of the index case (≥ 12 years) and vaccine effectiveness against transmission, the Netherlands, August–September 2021 (n = 4,921 index cases).

Table 3. Secondary attack rate of SARS-CoV-2 infection by vaccination status of the index case (≥ 12 years) and vaccine effectiveness against transmission, the Netherlands, August–September 2021 (n = 4,921 index cases).