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Volume 29, Number 4—April 2023
Research

Outbreaks of SARS-CoV-2 Infections in Nursing Homes during Periods of Delta and Omicron Predominance, United States, July 2021–March 2022

W. Wyatt WilsonComments to Author , Amelia A. Keaton, Lucas G. Ochoa, Kelly M. Hatfield, Paige Gable, Kelly A. Walblay, Richard A. Teran, Meghan Shea, Urooj Khan, Ginger Stringer, Meenalochani Ganesan, Jordan Gilbert, Joanne G. Colletti, Erin M. Grogan, Carly Calabrese, Andrew Hennenfent, Rebecca Perlmutter, Katherine A. Janiszewski, Christina Brandeburg, Ishrat Kamal-Ahmed, Kyle Strand, Matthew Donahue, M. Salman Ashraf, Emily Berns, Jennifer MacFarquhar, Meghan L. Linder, Dat J. Tran, Patricia Kopp, Rebecca M. Walker, Rebekah Ess, James Baggs, John A. Jernigan, Alex Kallen, Jennifer C. Hunter, and Monitoring Outbreaks of Variants in Nursing Homes (MOVIN) Surveillance Team1
Author affiliations: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (W.W. Wilson, A.A. Keaton, L.G. Ochoa, K.M. Hatfield, P. Gable, R.A. Teran, J. MacFarquhar, J. Baggs, J.A. Jernigan, A. Kallen, J.C. Hunter); Chicago Department of Public Health, Chicago, Illinois, USA (K.A. Walblay, R.A. Teran); Colorado Department of Public Health and Environment, Denver, Colorado, USA (M. Shea, U. Khan, G. Stringer, M. Ganesan, J. Gilbert); Connecticut Department of Public Health, Hartford, Connecticut, USA (J.G. Colletti, E.M. Grogan); Iowa Department of Health and Human Services, Des Moines, Iowa, USA (C. Calabrese, A. Hennenfent); Maryland Department of Health, Baltimore, Maryland, USA (R. Perlmutter); Massachusetts Department of Public Health, Jamaica Plain, Massachusetts, USA (K.A. Janiszewski, C. Brandeburg); Nebraska Department of Health and Human Services, Lincoln, Nebraska, USA (I. Kamal-Ahmed, K. Strand, M. Donahue, M.S. Ashraf); North Carolina Department of Health and Human Services, Raleigh, North Carolina, USA (E. Berns, J. MacFarquhar); Oregon Health Authority, Portland, Oregon, USA (M.L. Linder, D.J. Tran); South Carolina Department of Health and Environmental Control, Columbia, South Carolina, USA (P. Kopp, R.M. Walker); Utah Department of Health, Salt Lake City, Utah, USA (R. Ess).

Main Article

Figure 3

SARS-CoV-2 infection ARs and RRs per 100 nursing home residents by periods of Delta (n = 232) and Omicron (n = 279) variant predominance, United States, July 2021–March 2022. Values are given for residents who had received a primary vaccine series alone, adjusted for facility-level clustering. Resident infections were restricted to the first 28 days of outbreak because all reported outbreaks had at least a 28-day period for case ascertainment. AR, attack rate; RR, risk ratio.

Figure 3. SARS-CoV-2 infection ARs and RRs per 100 nursing home residents by periods of Delta (n = 232) and Omicron (n = 279) variant predominance, United States, July 2021–March 2022. Values are given for residents who had received a primary vaccine series alone, adjusted for facility-level clustering. Resident infections were restricted to the first 28 days of outbreak because all reported outbreaks had at least a 28-day period for case ascertainment. AR, attack rate; RR, risk ratio.

Main Article

1Additional members of the MOVIN Surveillance Team are listed at the end of this article.

Page created: February 23, 2023
Page updated: March 20, 2023
Page reviewed: March 20, 2023
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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