(1) A case of active tuberculosis disease exists if the case meets the laboratory or clinical criteria in (2) or (3).
(2) Laboratory criteria for active tuberculosis diagnosis:
(a) isolation of M. tuberculosis complex from a clinical specimen;
(b) demonstration of M. tuberculosis complex from a clinical specimen by nucleic acid amplification test; or
(c) demonstration of acid-fast bacilli in a clinical specimen when a culture has not been or cannot be obtained or is falsely negative or contaminated.
(3) Clinical criteria for active tuberculosis diagnosis:
(a) usually a positive tuberculin skin test result or positive interferon gamma release assay for M. tuberculosis;
(b) other signs and symptoms compatible with tuberculosis are for example: abnormal chest radiograph, abnormal chest computerized tomography scan or other chest imaging study, or clinical evidence of current disease;
(c) treatment with two or more antituberculosis medications; and
(d) a completed diagnostic evaluation.