Clinical Characteristics and Outcomes Among Adults Hospitalized with Laboratory-Confirmed SARS-CoV-2 Infection During Periods of B.1.617.2 (Delta) and B.1.1.529 (Omicron) Variant Predominance — One Hospital, California, July 15–September 23, 2021, and December 21, 2021–January 27, 2022

mRNA-based COVID-19 vaccine boosters induce neutralizing immunity against SARS-CoV-2 Omicron variant

(2022) Wilfredo F. Garcia-Beltran et al.   CELL

Trends in Disease Severity and Health Care Utilization During the Early Omicron Variant Period Compared with Previous SARS-CoV-2 High Transmission Periods — United States, December 2020–January 2022

(2022) A. Danielle Iuliano et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Effectiveness of a Third Dose 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) Mark G. Thompson et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

SARS-CoV-2 Infection and Hospitalization Among Adults Aged ≥18 Years, by Vaccination Status, Before and During SARS-CoV-2 B.1.1.529 (Omicron) Variant Predominance — Los Angeles County, California, November 7, 2021–January 8, 2022

(2022) Phoebe Danza et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Omicron SARS-CoV-2 variant: a new chapter in the COVID-19 pandemic

(2021) Salim S Abdool Karim et al.   LANCET

Third BNT162b2 Vaccination Neutralization of SARS-CoV-2 Omicron Infection

(2021) Ital Nemet et al.   NEW ENGLAND JOURNAL OF MEDICINE

SARS-CoV-2 vaccine protection and deaths among US veterans during 2021

(2021) Barbara A. Cohn et al.   SCIENCE

Severity of Disease Among Adults Hospitalized with Laboratory-Confirmed COVID-19 Before and During the Period of SARS-CoV-2 B.1.617.2 (Delta) Predominance — COVID-NET, 14 States, January–August 2021

(2021) Christopher A. Taylor et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Decreased severity of disease during the first global omicron variant covid-19 outbreak in a large hospital in tshwane, south africa

(2021) F. Abdullah et al.   INTERNATIONAL JOURNAL OF INFECTIOUS DISEASES