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.
Level of antibodies in IgA and IgG classes one month after the first dose of Pfizer-BioNTech anti-SARS-CoV-2 vaccine expressed in ratio (semi-quantitative Euroimmun test) in the non-previously SARS-CoV-2 infected participants control group (n = 33) and in convalescents (n = 17).
