Table 2.

Number of Events, Estimated Risk, Risk Ratios, Vaccine Effectiveness, and 95% Confidence Intervals Overall and by Time Since Vaccination With 1 Dose of Modified Vaccinia Ankara-Bavaria Nordic Vaccine

Time Since Vaccination, days	Unvaccinated		Vaccinated		Risk Ratio (95% CI)	Vaccine Effectiveness (95% CI)
	Events	Risk Per 1000	Events	Risk Per 1000
Overall	25	5.58	18	3.46	0.62 (0.31 to 1.24)	37.9% (−24.4 to 69.1)
0–6	8	1.46	11	2.02	1.38 (0.54 to 4.33)	−38.3% (−332.7 to 46.4)
0–13	13	2.47	15	2.82	1.14 (0.52 to 3.00)	−14.1% (−199.7 to 47.9)
≥7	17	4.13	7	1.44	0.35 (0.12 to 0.77)	65.0% (22.9 to 88.0)
≥14	12	3.12	3	0.65	0.21 (0.00 to 0.67)	79.3% (33.3 to 100.0)

Abbreviation: CI, confidence interval.