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.
Children with anti-PRP concentrations of >1 μg/mL, by age group and survey year
Data for 1998 and 2000 combined (A), 2004–05 (B), 2007 (C), and 2009 (D). The proportion of children aged 4–7 months in (A) is 0%. Error bars show 95% CI. PRP=polyribosylribitol phosphate.
