Adults Hospitalized with COVID-19 -United States, March-June and October-December 2020: Implications for the Potential Effects of COVID-19 Tier-1 Vaccination on Future Hospitalizations and Outcomes.

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Because of the increased risk for severe coronavirus disease 2019 (COVID-19), the Advisory Committee on Immunization Practices (ACIP) initially prioritized COVID-19 vaccination for persons in long-term care facilities (LTCF), persons aged ≥65 years, and persons aged 16-64 years with high-risk medical conditions when there is limited vaccine supply. We compared characteristics and severe outcomes of hospitalized patients with COVID-19 in the United States between early and later in the pandemic categorized by groups at higher risk of severe COVID-19.Observational study of sampled patients aged ≥18 years who tested positive for SARS-CoV-2 and admitted to one of 14 academic hospitals in the United States during March-June and October-December 2020. Demographic and clinical information were gathered from electronic health record data.Among 647 patients, 91% met ≥1 of the following risk factors for severe COVID-19 [91% March-June (n=434); 90% October-December (n=213)]; 19% were LTCF residents, 45% were aged ≥65-years, and 84% had ≥1 high-risk condition. The proportion of patients who resided in a LTCF declined significantly (25% vs. 6%) from early to later pandemic periods. Compared with patients at lower risk for severe COVID-19, in-hospital mortality was higher among patients at high risk for severe COVID-19 (20% vs. 7%); these differences were consistently observed between March-June and October-December.Most adults hospitalized with COVID-19 were those recommended to be prioritized for vaccination based on risk for developing severe COVID-19. These findings highlight the urgency to vaccinate patients at high risk for severe COVID-19 and monitor vaccination impact on hospitalizations and outcomes.

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Authors: Samira Sami, Mark W Tenforde, H Keipp Talbot, Christopher J Lindsell, Jay S Steingrub, Nathan I Shapiro, Adit A Ginde, David J Douin, Matthew E Prekker, Heidi L Erickson, Samuel M Brown, Ithan D Peltan, Michelle N Gong, Akram Khan, Matthew C Exline, D Clark Files, Kevin W Gibbs, Todd W Rice, Jonathan D Casey, Carlos G Grijalva, William B Stubblefield, Kelsey N Womack, David N Hager, Nida Qadir, Steven Y Chang, Daniel J Henning, Jennifer G Wilson, Wesley H Self, Manish M Patel, IVY Network Investigators