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Table 2 Positivity rates for Mycobacterium tuberculosis by test method

From: Performance evaluation of Truenat MTB and Truenat MTB-RIF DX assays in comparison to gene XPERT MTB/RIF ultra for the diagnosis of pulmonary tuberculosis in Uganda

Test/Results

n (%)

TrueNat (N = 242)

 

MTB detected

69 (28.5)

Rifampicin Resistance Not Detected

56 (81.2)

Rifampicin Resistance detected

1 (1.5)

Indeterminate

12 (17.4)

GeneXpert Ultra (N = 249)

 

MTB detected

84 (33.7)

Trace

2 (2.4)

Very low

10 (11.7)

Low

25 (29.4)

Medium

20 (23.5)

High

28 (32.9)

Rifampicin Resistance Not Detected

81(96.4)

Rifampicin Resistance detected

0

Indeterminate

3 (3.5)

Concentrated smear microscopy (N = 250)

 

Positive

57 (22.8)

Scanty

9 (15.8)

1+

15 (26.3)

2+

18 (31.6)

3+

15 (26.3)

LJ Culture (N = 245)

 

MTBC positive

57 (23.3)

Contaminated

1 (0.4)

MGIT Culture (N = 250)

 

MTBC positive

72 (28.8)

Contaminated

21 (8.4)

NTM

14 (5.6)

  1. LJ= Lowenstein Jensen, MGIT= Mycobacterial Growth Indicator Tube, % percentage, NTM= Non-Tuberculous Mycobacteria, MTBC= Mycobacterium Tuberculosis Complex