An official website of the United States government
Here's how you know
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.
Scatter plot of the difference between RT-PCR and bDNA values of log10 HIV-1 RNA copies per milliliter against their means. The mean difference (solid line) ± 2 standard deviations (dashed lines) are shown.