Figure 3. Age-specific seroprevalence of IgG-Ptx concentrations in individuals >9 years in 1995-96 (upper figure) and in 2006-07 (lower figure).
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.