Evaluating the role of Mycobacterium tuberculosis PCR in ruling out active tuberculosis.

Am J Infect Control

Infection Prevention and Control Department, UCHealth, Aurora, CO; Infection Prevention and Control Department, University of Colorado School of Medicine, Aurora, CO. Electronic address:

Published: November 2024

Laboratory algorithms using Acid-Fast Bacilli staining and Mycobacterium tuberculosis (Mtb) polymerase chain reaction (PCR) are often used to remove isolation precautions. A retrospective case review of 52 patients with culture-confirmed pulmonary Mtb revealed 4 subjects with negative sputum Acid-Fast Bacilli smears and negative Mtb PCRs. All had significant risk factors for Mtb and had a positive interferon-gamma release assay. A negative PCR test result does not exclude an Mtb diagnosis.

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http://dx.doi.org/10.1016/j.ajic.2024.06.023DOI Listing

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