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Table 2 Xpert MTB/RIF positive, culture negative cases

From: The utility of Xpert MTB/RIF performed on bronchial washings obtained in patients with suspected pulmonary tuberculosis in a high prevalence setting

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

  1. PTB pulmonary tuberculosis, Ct value cycle threshold value