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]

Classification

Class	Type of Tuberculosis	Description
	No TB exposure Not infected	No history of TB exposure Negative result to a TST or IGRA

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.

United States Immigrant/Refugee TB Classification

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