please give the latest WHO classification(on the basis of Lymphnode involvement)of pulmonary tuberculosis.
Respiratory Diseases - 1 Answers
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Class Type Description 0 No TB exposure Not infected No history of exposure Negative reaction to tuberculin skin test 1 TB exposure No evidence of infection History of exposure Negative reaction to tuberculin skin test 2 TB infection No disease Positive reaction to tuberculin skin test Negative bacteriologic studies (if done) No clinical, bacteriologic, or radiographic evidence of TB 3 TB, clinically active M. tuberculosis cultured (if done) Clinical, bacteriologic, or radiographic evidence of current disease 4 TB Not clinically active History of episode(s) of TB or Abnormal but stable radiographic findings Positive reaction to the tuberculin skin test Negative bacteriologic studies (if done) and No clinical or radiographic evidence of current disease 5 TB suspect Diagnosis pending TB disease should be ruled in or out within 3 months [edit] 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 Class B3 (TB, old or healed; chest X-ray with calcification) has been omitted from the classification scheme because it has not been found to be associated with active TB
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