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.
Study regions (in green) with indicated centers in each region where data on vaccination coverage were collected (B1 to B10–centers in Belgorod Oblast, Y1 to Y16–centers in Yakutia). The capital of each region is underlined. The number of participants in each step of the study (newborn vaccination coverage, serosurvey, survey of university students and teachers) are indicated in the callouts.
