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. 2021 Sep 17;70(37):1291-1293.
doi: 10.15585/mmwr.mm7037e2.

Interim Estimates of COVID-19 Vaccine Effectiveness Against COVID-19-Associated Emergency Department or Urgent Care Clinic Encounters and Hospitalizations Among Adults During SARS-CoV-2 B.1.617.2 (Delta) Variant Predominance - Nine States, June-August 2021

Shaun J Grannis, Elizabeth A Rowley, Toan C Ong, Edward Stenehjem, Nicola P Klein, Malini B DeSilva, Allison L Naleway, Karthik Natarajan, Mark G Thompson; VISION Network

Interim Estimates of COVID-19 Vaccine Effectiveness Against COVID-19-Associated Emergency Department or Urgent Care Clinic Encounters and Hospitalizations Among Adults During SARS-CoV-2 B.1.617.2 (Delta) Variant Predominance - Nine States, June-August 2021

Shaun J Grannis et al. MMWR Morb Mortal Wkly Rep. .

Erratum in

  • Erratum: Vol. 70, No. 37.
    [No authors listed] [No authors listed] MMWR Morb Mortal Wkly Rep. 2021 Dec 10;70(49):1717. doi: 10.15585/mmwr.mm7049a6. MMWR Morb Mortal Wkly Rep. 2021. PMID: 34882657 Free PMC article. No abstract available.

Abstract

Data on COVID-19 vaccine effectiveness (VE) since the B.1.617.2 (Delta) variant of SARS-CoV-2, the virus that causes COVID-19, became the predominant circulating strain in the United States are limited (1-3). CDC used the VISION Network* to examine medical encounters (32,867) from 187 hospitals and 221 emergency departments (EDs) and urgent care (UC) clinics across nine states during June-August 2021, beginning on the date the Delta variant accounted for >50% of sequenced isolates in each medical facility's state. VISION Network methods have been published (4).

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References

    1. Thompson MG, Burgess JL, Naleway AL, et al. Prevention and attenuation of Covid-19 with the BNT162b2 and mRNA-1273 vaccines. N Engl J Med 2021;385:320–9. 10.1056/NEJMoa2107058 - DOI - PMC - PubMed
    1. Tenforde MW, Self WH, Naioti EA, et al.; IVY Network Investigators; Ivy Network. Sustained effectiveness of Pfizer-BioNTech and Moderna vaccines against COVID-19 associated hospitalizations among adults—United States March–July 2021. MMWR Morb Mortal Wkly Rep 2021;70:1156–62. 10.15585/mmwr.mm7034e2 - DOI - PMC - PubMed
    1. Haas EJ, Angulo FJ, McLaughlin JM, et al. Impact and effectiveness of mRNA BNT162b2 vaccine against SARS-CoV-2 infections and COVID-19 cases, hospitalisations, and deaths following a nationwide vaccination campaign in Israel: an observational study using national surveillance data. Lancet 2021;397:1819–29. 10.1016/S0140-6736(21)00947-8 - DOI - PMC - PubMed
    1. Thompson MG, Stenehjem E, Grannis S, et al. Effectiveness of COVID-19 vaccines in ambulatory and inpatient care settings. N Engl J Med 2021. Epub September 8, 2021. 10.1056/NEJMoa2110362 - DOI - PMC - PubMed

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