Table 2.
Xpert MTB/RIF positive, culture negative cases
| Case | Previous PTB | Ct value | Treated for PTB | Alternative diagnoses/comments |
|---|---|---|---|---|
| 1 | Unknown | Low | Yes | Confirmed pleural tuberculosis |
| 2 | No | Very low | Yes | Takayashu’s arteritis |
| 3 | Unknown | Very low | Yes | Clinical response to PTB treatment |
| 4 | Yes | Medium | No | Surveillance bronchoscopy to exclude bronchial stenosis 1 year after PTB |
| 5 | Yes | Very low | No | Repeat bronchoscopy culture and Xpert MTB/RIF negative |
| 6 | Unknown | Very low | No | Squamous cell carcinoma of the lung |
| 7 | No | Very low | No | Squamous cell carcinoma of the lung |
| 8 | No | Very low | No | Symptoms resolved with treatment |
| 9 | Yes | Very low | No | Culture positive for Mycobacterium avium intracellulare |
PTB pulmonary tuberculosis, Ct value cycle threshold value