Use of string test and stool specimens to diagnose pulmonary tuberculosis
2015
Summary Background The Xpert MTB/RIF (MTB/RIF) test has advanced the field of tuberculosis (TB) diagnostics; however, depending on age and HIV status, 10–85% of individuals with presumed pulmonary TB (PTB) are unable to produce sputum. Methods The feasibility of using MTB/RIF and culture on stool and string test specimens from 13 adult patients with presumed PTB was studied. Results The string test was well tolerated with a median Wong Baker Faces score of 2. The string test had 100% sensitivity and specificity by MTB/RIF and 87.5% sensitivity and 100% specificity by culture. In stool, Mycobacterium tuberculosis DNA was detected in all cases of culture-confirmed PTB. Conclusion The string test and stool provide diagnostic specimens that warrant further investigation.
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