Tuberculosis classification
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: João André Alves Silva, M.D. [2]
Overview
Classification
CDC TB Classification for Immigrants and Refugees
The U.S. Citizenship and Immigration Services has an additional TB classification for immigrants and refugees developed by the Centers for Disease Control and Prevention (CDC). The 'B Notification Program' is an important screening strategy to identify new arrivals who have a high risk for TB.
| Class | Chest X-ray | AFB smear | Restrictions |
| A - TB, infectious | Active TB | Positive | No entry to U.S. until treated and smears are negative |
| B1 - TB, clinically active, not infectious | Active TB | Negative | Report to local health department for further medical evaluation within 30 days of arrival in U.S. |
| B2 - TB, not clinically active | Inactive TB | Not required unless symptomatic | Same as above |
| No class (Normal) | Normal | Not required | None |