Figure 1From: Timing of therapy for latent tuberculosis infection among immigrants presenting to a U.S. public health clinic: a retrospective study 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.Back to article page