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.
Reverse cumulative distribution of anti-PRP antibody concentrations (μg/ml) for groups of children whose sera were collected between 1994 and 2003. The two vertical lines indicate the cutoff for the titers associated with short-term (>0.15 μg/ml) and long-term (>1.0 μg/ml) protection from invasive Hib disease.
