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
MMWR Morbidity and Mortality Weekly Report (2021) - Comments
doi: 10.15585/mmwr.mm7037e2  issn: 0149-2195  issn: 1545-861x  pubmed: 34529642 

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