Figure 1.
Flowchart depicting the study design. COVID-19 = coronavirus disease 2019; RT-PCR = reverse-transcriptase polymerase chain reaction; VTM = viral transport media.
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.