Volume 28, Number 8—August 2022
Research Letter
Estimating COVID-19 Vaccine Effectiveness for Skilled Nursing Facility Healthcare Personnel, California, USA
Monise Magro
, Andrea Parriott, Tisha Mitsunaga, and Erin Epson
, Andrea Parriott, Tisha Mitsunaga, and Erin Epson
Table
Estimated COVID-19 vaccine effectiveness among skilled nursing facility healthcare personnel, California, USA, January‒March 2021*
| Models | Vaccination status† | No. |
Vaccine effectiveness (95% CI), % | |
|---|---|---|---|---|
| Case-patients | Controls | |||
| No removal of previous positive results (4,238 case‒control participants; 2,119 matched pairs) | Partial | 465 | 629 | 37.5 (27.7–46.0) |
| Full | 36 | 94 | 71.7 (55.9–81.8) | |
| Removal of previous positive results within 90 d (3,742 case‒control participants; 1,871 matched pairs) | Partial | 430 | 567 | 35.6 (24.8–44.8) |
| Full | 32 | 89 | 73.3 (57.5–83.3) | |
| Removal of previous positive results within 180 d (3,424 case‒control participants; 1,712 matched pairs) | Partial | 394 | 524 | 36.3 (25.1–45.8) |
| Full | 25 | 70 | 72.7 (54.3–83.7) | |
*Unadjusted analysis results are presented. Adjustment for sex, age, and Healthy Places Index scores did not substantially alter these estimates. †Partial vaccination: >1 dose before specimen collection date but final dose <14 d before specimen collection date; full vaccination: final dose >14 d before specimen collection date.
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Page updated: July 21, 2022
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