Table 4. Relationship between vaccination status, antibody positivity and the interval between household exposure (PCR positive test in index case) and serological testing of HHC.

Vaccination status	Serological response	Number of contacts	Interval between household exposure and serological testing
		Total n = 454	median	IQR
Unvaccinated Total 221	Spike positive	166	117	91–147
	NC positive
	Spike positive	32	157	121–161
	NC negative
	Spike negative	3	198	143–198
	NC positive
	Spike negative	20	124	108–167
	NC negative
Vaccinated	Spike positive	183	133	108–161
Total 233	NC positive
	Spike positive	50	137	126–163
	NC negative
	Spike negative	0
	NC positive
	Spike negative	0
	NC negative