Fig 4.
Kaplan-Meier curves on time to first a) seroconversion and b) seroreversion at a follow-up attendance in nested longitudinal study (y axis limited to 365 days; small vertical tick marks show censoring times).
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.