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Volume 28, Number 8—August 2022
Research Letter

Estimating COVID-19 Vaccine Effectiveness for Skilled Nursing Facility Healthcare Personnel, California, USA

Monise MagroComments to Author , Andrea Parriott, Tisha Mitsunaga, and Erin Epson
Author affiliation: Author affiliation: California Department of Public Health, Richmond, California, USA

Main Article


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.

Main Article

Page created: May 26, 2022
Page updated: July 21, 2022
Page reviewed: July 21, 2022
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