Question

Categorization of the tuber culosis

Answer 1

The current clinical classification system for tuberculosis (TB) is based on the pathogenesis of the disease.

Health care providers should comply with local laws and regulations requiring the reporting of TB. All persons with class 3 or class 5 TB should be reported promptly to the local health department.

Classification System for TBClassTypeDescription0No TB exposure
Not infectedNo history of exposure
Negative reaction to tuberculin skin test1TB exposure
No evidence of infectionHistory of exposure
Negative reaction to tuberculin skin test2TB infection 
No diseasePositive reaction to tuberculin skin test
Negative bacteriologic studies (if done)
No clinical, bacteriologic, or radiographic evidence of TB3TB, clinically activeM. tuberculosis cultured (if done)
Clinical, bacteriologic, or radiographic evidence of current disease4TB 
Not clinically activeHistory 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 disease5TB suspectDiagnosis pending
TB disease should be ruled in or out within 3 months

Answer 2

TB classifications

Tuberculosis classification system

ClassType1TB exposure No evidence of infection2TB infection No disease3TB, clinically active4TB Not clinically active


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