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.
Mean age at immunization with measles vaccine (MV) (n = 202,987) and measles-mumps rubella vaccine dose one (MMR-1) (n = 171,042) and dose two (MMR-2) (n = 55,345) by birth year, among children receiving each vaccine, children born 2004 – 2011, Tianjin, China.
