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. 2022 Jun 6:ciac454. doi: 10.1093/cid/ciac454

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© The Author(s) 2022. Published by Oxford University Press on behalf of Infectious Diseases Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com

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Figure 1. — Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) polymerase chain reaction tests among University of Pennsylvania Health System employees included in the study sample. Dashed vertical line indicates the start of the Omicron period—20 December 2021—after which >80% of evaluated SARS-CoV-2 isolates were identified as confirmed (via sequencing) or presumptive (via S-gene target failure) Omicron.