COVID-19 Cases and Hospitalizations by COVID-19 Vaccination Status and Previous COVID-19 Diagnosis — California and New York, May–November 2021

Reduced Risk of Reinfection with SARS-CoV-2 After COVID-19 Vaccination — Kentucky, May–June 2021

(2021) Alyson M. Cavanaugh et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

New COVID-19 Cases and Hospitalizations Among Adults, by Vaccination Status — New York, May 3–July 25, 2021

(2021) Eli S. Rosenberg et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Comparative Effectiveness of Moderna, Pfizer-BioNTech, and Janssen (Johnson & Johnson) Vaccines in Preventing COVID-19 Hospitalizations Among Adults Without Immunocompromising Conditions — United States, March–August 2021

(2021) Wesley H. Self et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT

Duration of Severe Acute Respiratory Syndrome Coronavirus 2 Natural Immunity and Protection Against the Delta Variant: A Retrospective Cohort Study

(2021) Priscilla Kim et al.   CLINICAL INFECTIOUS DISEASES

Covid-19 Vaccine Effectiveness in New York State

(2021) Eli S. Rosenberg et al.   NEW ENGLAND JOURNAL OF MEDICINE

Laboratory-Confirmed COVID-19 Among Adults Hospitalized with COVID-19–Like Illness with Infection-Induced or mRNA Vaccine-Induced SARS-CoV-2 Immunity — Nine States, January–September 2021

(2021) Catherine H. Bozio et al.   MMWR-MORBIDITY AND MORTALITY WEEKLY REPORT