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.
Effect of skin testing on IgG anti-PPD-B antibody responses. Serum samples (n = 122) were taken 3 days (PPD-B May) and 31 days (PPD-B June) after a SIT performed on 19 May 2014, and antibodies were measured. A, proportion of samples positive by the two-antigen rule; B, antibody levels above the cutoff. SD, standard deviation.
