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.
Comparison of RT-qPCR assays (NIID_N2, & CDC_N1N2) based on copy number. Magenta circles represent the solid fractions of weekly collected samples from the three sample collection sites. Gray squares represent dilution series of RNA from SARS-CoV-2 isolate. Values are presented as the number of SARS-CoV-2 RNA gene copies per reaction of the RT-qPCR assays. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
