Table 1.

Baseline characteristics of study participants.

	Vaccinated Cohort (n = 254)	Unvaccinated Cohort (n = 81)
Participant category	Healthcare workers	Community
Pre-vaccination visit period	7–12 April 2021	1 February–16 March 2021
Sex, n (%)
Male	174 (68.5)	42 (51.9)
Female	80 (31.5)	39 (48.1)
Age in years, mean (SD)	32.3 (7.9)	32.3 (12.3)
Pre-existing medical condition, n (%)	16 (6.3)	6 (7.4)
SARS-CoV-2 seroprevalence, n (%)
By anti-nucleocapsid antibody	158 (62.2)	31 (38.5)
By anti-spike antibody	165 (65)	32 (39.5)