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.
Histogram of viral load values among patients with an elevated viral load in South Africa, 2013–2015. Plotted histogram of viral load laboratory test values to check for bunching on either side of the 1,000 copies/mL threshold. Lack of bunching around the threshold suggests that patients and providers did not systematically manipulate the assignment variable (viral load values) (n = 191,764).
