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Objective To evaluate the value of GeneXpert MTB/RIF Ultra (Xpert Ultra) in the early and rapid diagnosis of sputum and bronchoalveolar lavage fluid (BALF) samples in patients with smeared negative tuberculosis. Methods A total of 93 patients with sputum smear-negative suspected pulmonary tuberculosis who were admitted to Shandong Public Health Clinical Center from May 2020 to December 2021 were included in this study. Among them, 57 patients were clinically diagnosed as sputum smear-negative pulmonary tuberculosis and 36 patients were non-pulmonary tuberculosis. Sputum and BALF samples were collected from all patients, and Xpert Ultra, GeneXpert MTB/RIF (Xpert), BACTEC MGIT 960 culture (MGIT 960 culture) were performed. To evaluate the sensitivity, specificity and coincidence rate of various detection methods and their combined detection of sputum and bronchoalveolar lavage fluid samples in the diagnosis of smeared negative pulmonary tuberculosis. Results Taking clinical diagnosis as the reference standard, the sensitivity of sputum samples detected by Xpert Ultra for the diagnosis of smeared negative pulmonary tuberculosis was significantly higher than that of Xpert [56.14% (32/57) vs. 36.84% (21/57), P=0.039] and MGIT 960 culture [56.14% (32/57) vs. 33.33% (19/57), P=0.014]. The sensitivity of BALF samples detected by Xpert Ultra for the diagnosis of smeared negative pulmonary tuberculosis was significantly higher than that of Xpert [75.44% (43/57) vs. 56.14% (32/57),P=0.030] and MGIT 960 culture [75.44% (43/57) vs. 38.60% (22/57), P<0.01]. Three different methods of testing sputum samples, the area under the receiver operating characteristic curve (AUC) was the combination of the three elements (0.807)>Xpert Ultra+Xpert (0.798)>Xpert Ultra+MGIT 960 culture (0.789)>Xpert Ultra method (0.781)>Xpert (0.684)>MGIT 960 culture (0.667);Samples of BALF were examined, the AUC was the combination of the three elements (0.895)=Xpert Ultra+Xpert (0.895)>Xpert Ultra+MGIT 960 culture (0.877)=Xpert Ultra method (0.877)>Xpert (0.781)>culture method (0.693). Rifampicin resistance was not detected in the enrolled samples by the three detection methods. Conclusions Xpert Ultra has high clinical application value in the early and rapid diagnosis of smeared negative pulmonary tuberculosis, and the sensitivity of Xpert Ultra in the detection of BALF is higher than that of sputum sample, so the BALF sample is recommended as prior selection.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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