“…Data on residents were abstracted starting on the date of their SNF's first vaccination clinic or their admission into the facility, whichever occurred later. Electronic medical record data included demographic characteristics, facility admission and discharge dates, vaccination dates, symptoms of COVID-19 occurring within 7 days before or 14 days after a positive test result, presence of underlying medical conditions associated with potential increased risk for severe COVID-19 illness, ¶ 1 ; Gordana Derado, PhD 1 ; Jennifer R. Verani, MD 1 ; Stephanie J. Schrag, DPhil 1 ; John A. Jernigan, MD 1 ; Vivian H. Leung, MD 3, † ; Sunil Parikh, MD 4, † and death. SARS-CoV-2 test dates, test types, and results were also obtained from the electronic medical record.…”