Evaluating a New Test for Detecting Tuberculosis in Sputum
Author Information
Author(s): Zhu Changtai, Cui Zhenling, Zheng Ruijuan, Yang Hua, Jin Ruiliang, Qin Lianhua, Liu Zhonghua, Wang Jie, Hu Zhongyi
Primary Institution: Shanghai Key Laboratory of Tuberculosis, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, People's Republic of China
Hypothesis
To evaluate the performance of phage amplified biologically assay (PhaB) for detecting tuberculosis (TB) in sputum in pulmonary tuberculosis (PTB) patients.
Conclusion
PhaB method is a rapid and sensitive method for detecting TB in sputum in PTB patients, especially for the diagnosis of smear-negative PTB.
Supporting Evidence
- The sensitivity of PhaB was higher than that of L-J culture and smear microscopy.
- PhaB detected 320 smear-negative specimens as positive, while L-J culture detected only 105.
- The median time for PhaB results was 48 hours compared to 31 days for L-J culture.
Takeaway
The PhaB test can find tuberculosis germs in sputum faster and more accurately than older tests, especially when the germs are hard to see.
Methodology
Participants' sputum samples were tested using smear microscopy, PhaB, and Löwenstein-Jensen culture methods.
Potential Biases
Potential for false positives or negatives due to cross-reactivity with other mycobacteria.
Limitations
Some true positive results may be misclassified as negative by L-J culture, affecting specificity.
Participant Demographics
1351 PTB patients and 309 non-TB patients, median age 34 for PTB patients and 38 for non-TB patients.
Statistical Information
P-Value
p<0.05
Confidence Interval
95% Cl: 96.9–99.3
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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