Impact of COVID-19 vaccine on patient outcomes.^aAmong 17 patients who did not receive a COVID-19 vaccine, 7 contracted COVID-19. The dates of onset of COVID-19 infection were between 21 July 2020 and 9 April 2022, and the end dates of COVID-19 infection were between 5 August 2020 and 29 April 2022. Of the 7 patients who did not receive a COVID-19 vaccine and contracted COVID-19, 1 patient experienced grade 3 COVID; this patient received cefepime IV transfusion for 7 days and remdesivir IV transfusion for 4 days, and their COVID-19 resolved. The 6 other patients who did not receive a COVID-19 vaccine and contracted COVID-19 died; 5 deaths were due to COVID-19 and 1 death was due to disease progression. ^bAmong the 4 patients who received the COVID-19 vaccine, 1 patient received 3 doses of the Pfizer messenger RNA vaccine on 5 March 2021, 9 June 2021, and 7 January 2022, and then contracted grade 2 COVID-19 on 9 March 2022, which resolved on 20 March 2022. The other 3 patients did not contract COVID-19. Gr, grade; VAX, vaccination.