Table 7.

Vaccine effectiveness for the prevention of at least moderate infection.

Vaccination status (median days from last vaccination; IQR)	Cases (with moderate infection) (N = 116) (N; %)	Controls (without infection) (N = 1,898) (N; %)	Adjusted odds Ratio (95% CI)	Adjusted VE (%; 95% CI)
No vaccination	67 (57.8)	230 (12.1)	Reference	–
1 dose (44 days; 32–81)	7 (0.1)	41 (2.2)	0.94 (0.29–3.01)	5.7 (−66.8–70.5)
2 doses (93 days; 63–118)	30 (25.8)	760 (40.0)	0.75 (0.25–2.31)	24.3 (−56.9–75.3)
3 doses (52 days; 28–91)	11 (0.1)	596 (31.4)	0.37 (0.10–1.30)	62.9 (−23.6–89.5)
≥ 4 doses (47 days; 26–72)	1 (0.1)	271 (14.3)	0.09 (0.01–0.90)	90.6 (10.0–99.3)

Adjusted for vaccination status, age group, household contact, and gender.

VE, vaccine effectiveness; CI, confidence interval; IQR, interquartile range.