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.
Source of referral for LTBI therapy in our study cohort according to region of origin, Prince Georges County Health Department, Maryland, 1999–2004. Abbreviation: PMD = Primary Medical Doctor. Immigration = Referral from the U.S. Citizenship and Immigration Services following medical evaluation for refugees, immigrants, and status adjustment.
