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. 2021 Jul 21:1–7. doi: 10.1017/ice.2021.336

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© The Society for Healthcare Epidemiology of America 2021

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means subject to acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Fig. 3. — Proportional hazards model of the effect of vaccination on the probability of testing positive for SARS-CoV-2. The figure shows the probability of a positive SARS-CoV-2 test in the study population after the start of a healthcare system-wide COVID-19 vaccination campaign using proportional hazards models. The risk was evaluated for 3 groups: (1) unvaccinated individuals (solid line), (2) individuals who received 1 dose of SARS-CoV-2 vaccine (short-dashed line), and (3) individuals who received both doses of SARS-CoV-2 vaccine (long-dashed line). Shaded areas represent 95% confidence intervals.