Effectiveness of a COVID-19 Additional Primary or Booster Vaccine Dose in Preventing SARS-CoV-2 Infection Among Nursing Home Residents During Widespread Circulation of the Omicron Variant — United States, February 14–March 27, 2022

Association Between 3 Doses of mRNA COVID-19 Vaccine and Symptomatic Infection Caused by the SARS-CoV-2 Omicron and Delta Variants

(2022) Emma K. Accorsi et al.   JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION

Effectiveness of mRNA-1273 against SARS-CoV-2 Omicron and Delta variants

(2022) Hung Fu Tseng et al.   NATURE MEDICINE

Waning 2-Dose and 3-Dose Effectiveness of mRNA Vaccines Against COVID-19–Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Adults During Periods of Delta and Omicron Variant Predominance — VISION Network, 10 States, August 2021–January 2022

(2022) Jill M. Ferdinands et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Protection by a Fourth Dose of BNT162b2 against Omicron in Israel

(2022) Yinon M. Bar-On et al.   NEW ENGLAND JOURNAL OF MEDICINE

Rates of COVID-19 Among Residents and Staff Members in Nursing Homes — United States, May 25–November 22, 2020

(2021) Suparna Bagchi et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Effectiveness of Pfizer-BioNTech and Moderna Vaccines in Preventing SARS-CoV-2 Infection Among Nursing Home Residents Before and During Widespread Circulation of the SARS-CoV-2 B.1.617.2 (Delta) Variant — National Healthcare Safety Network, March 1–August 1, 2021

(2021) Srinivas Nanduri et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT