Figure 1.
Following healthcare workers after the vaccination and evaluation, according to time. PI: previously infected with SARS-CoV-2, NPI: not previously infected with SARS-CoV-2, Ab: antibodies.
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.