Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Relative risk for the secondary attack rates of child and adult contacts in household SARS-CoV-2 variant of concern transmission stratified by vaccination status
CI: confidence interval; RR: relative risk; SARS-CoV-2: severe acute respiratory syndrome coronavirus 2; UK: United Kingdom; US: United States.
Cases describe the number of SARS-CoV-2-positive individuals identified in the study. Vaccinated adults were defined as having received at least one dose of vaccine.
