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.
Levels of anti‐SARS‐CoV‐2 IgG in 43 COVID‐19 patients. (Ab titer = antibody index serum/cutoff ratio; positive > 1.0). IgG antibody titers over time for all patients (A), by gender (B), and age (C). First antibody response, 15 days postsymptom onset; second antibody response, 30 days postsymptom onset; third Antibody response, 45 days postsymptom onset; fourth antibody response, 60 days postsymptom onset
