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.
Mucosal sIgA response in the oral cavity of COVID-19 and control (CTR) subjects. The positivity is expressed as the ratio (R) between the value detected in the sample and the threshold control value, following manufacturer’s instructions; mean value with range is also shown.
