EARLY RELEASE: SARS-CoV-2 B.1.1.529 (Omicron) Variant Transmission Within Households - Four U.S. Jurisdictions, November 2021-February 2022

Published on February 25, 2022

This report describes how Omicron infection resulted in high transmission among household contacts. Prevention strategies are important to reduce transmission in households.

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Erratum: Vol. 71, No. 3

February 24, 2022
MMWR erratum volume 71, number 3.

EARLY RELEASE: Effectiveness of COVID-19 Pfizer-BioNTech BNT162b2 mRNA Vaccination in Preventing COVID-19-Associated Emergency Department and Urgent Care Encounters and Hospitalizations Among Nonimmunocompromised Children and Adolescents Aged 5-17 Year...

March 1, 2022
This report describes mRNA COVID-19 vaccine effectiveness in preventing emergency department and urgent care encounters as well as hospitalizations among children and adolescents.