Table 2.
Estimates of Messenger RNA Vaccine Effectiveness Against Laboratory-Confirmed Coronavirus Disease 2019 Among Outpatients, Using Vaccine Doses Verified by Immunization Documentation
| Vaccination Status | Outpatients, No. Vaccinated/Total (% Vaccinated) | VE (95% CI), % | ||
|---|---|---|---|---|
| SARS-CoV-2 Positive (Cases) | SARS-CoV-2 Negative (Controls) | Unadjusted | Adjusteda | |
| Full vaccination | 17/216 (8) |
231/480 (48) |
91 (84–95) | 91 (83–95) |
| Partial vaccination | 20/219 (9) | 96/345 (28) | 74 (56–84) | 75 (55–87) |
Abbreviations: CI, confidence interval; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; VE, vaccine effectiveness.
aVE adjusted for study site, age in years (continuous), enrollment period (natural cubic spline with 3 percentile knots), race/ethnicity, and contact with a SARS-CoV-2–positive person.