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Table 5 Co-morbid conditions present in QFT negative study subjects

From: Testing for Mycobacterium tuberculosis infection using the QuantiFERON-TB GOLD assay in patients with comorbid conditions in a tertiary care endemic setting

Subjects with Active TB (n = 20)

Co-morbids

Frequency (n, %)

TB Ag (IFNγ IU/ml, Median)

Mitogen (IFNγ IU/ml, Median)

TLC (%)

Lymphocytes (%)

None known

12 (60)

0.025

10

8.1

18.2

Diabetes

3 (15)

0.07

5.79

8.1

19.4

Other Endo

1 (5)

0.03

8.27

13.2

19

Auto immune diseasea

1 (5)

0.01

1.85

10.7

15.9

Malignancy

1 (5)

0.04

0.77

109

1

CHD

1 (5)

0.01

10

7

32

Multiple Co-morbidsb

1 (5)

0.1

4.08

7.7

17.7

Subjects with Non-TB (n = 73)

 

Co-morbids

Frequency

(n, %)

TB Ag

(IFNγ IU/ml, Median)

Mitogen

(IFNγ IU/ml, Median)

TLC (%)

Lymphocytes

(%)

None known

24 (33)

0.025

10

7.4

23.6

Chronic Kidney Disease

7 (10)

0.04

8.15

7.8

20.6

Chronic Lung Disease

3 (4)

0.04

7.66

5.8

17.9

Diabetes

10 (14)

0

7.81

11

11.8

Auto Immune diseasea

6 (8)

0.01

10

9.4

17

Malignancy

10 (14)

0.065

6.88

8.1

23.5

Epilepsy

1 (1)

0.03

10

5.8

38.4

Coronary Heart Disease

1 (1)

0

4.29

24.4

12

Multiple co-morbids

11 (15)

0

10

36

21.3

  1. ‘TLC’, Total lymphocyte count; ‘QFT’, Quantiferon TB Gold in tube assay; ‘COPD’, Chronic Obstructive Pulmonary Disorder. Cut-off for QFT positive is ≥0.35 IU/ml. Lymphopenia was determined by lymphocyte counts < 1500 cells/mm3.’a’ autoimmune disease includes Rheumatoid arthritis, Systemic Lupus Erythematosis and mixed connective tissue disorders. ‘b’ patients with multiple diseases including, diabetes, chronic liver disease, chronic kidney disease, endocrine disorders (panhypo-pitutiarism, hypothyroidism, thalassemia and malignancy)