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.
Subject disposition in each age cohort and vaccine group. *N values include blood draws outside the specified time window; †Fourth vaccination to be done only on the subset of naïve subjects <9 years of age. HI – hemagglutination inhibition.
