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.
Cumulative proportions of patients starting antiretroviral therapy over time for CD4 count thresholds of 500, 350 and 200 cells/μl and (A) different frequencies of CD4 count measurements, and (B) without and with a requirement for a confirmatory measurement.
