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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

2021; Centers for Disease Control and Prevention; Volume: 70; Issue: 37 Linguagem: Inglês

10.15585/mmwr.mm7037e2

1545-861X

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

COVID-19 epidemiological studies

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).