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.
“Lost to follow-up” refers to individuals who were not seen at the time point indicated and subsequently never seen again. “Visit data unavailable” refers to individuals who were not seen at the time point indicated but subsequently seen. Deaths are reported as additional deaths between each time point.
