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Table 1 Descriptive characteristics of contacts identified through high priority contact tracing stratified by adults (≥15) and children (< 14)

From: Implementing contact tracing for tuberculosis in Kyrgyz Republic and risk factors for positivity using QuantiFERON-TB Gold plus

Category Combined Adults (> 15 yrs) Children (< 14 yrs)
Number of contacts found 296 185 111
Mean age 29.2 yrs. 41.9 yrs. 7.8 yrs.
range 0-87 yrs 15-87 yrs 0-14 yrs
Sex ratio (M:F) 0.9 0.85 0.98
IC ss+ 144/296 96/185 48/111
48.7% 52.0% 43.2%
Home contacts 210 /296 122/185 88/111
71.0% 65.9% 79.3%
Symptoms present 50/296 34/185 16/111
16.9% 18.4% 14.4%
LTBIa 103/253 69/150 34/103
40.7% 46.0% 33.0%
Active TBb 4/296 3/185 1/111
1.4% 1.6% 0.9%
TB specific changes in chest-x-ray 2/212 2/143 0/69
0.9% 1.4% 0.0%
TST positivec 35/95 5/7 30/88
36.8% 71.4% 34.1%
QFTG positive 89/214 69/149 20/65
41.6% 46.3% 30.8%
TST positive confirmed by QFTG/ TST positive with QFTG result 10/21 2/5 8/16
47.6% 40% 50%
QFTG positive with IC ss+ / IC ss + with QFTG result 51/105 41/76 10/29
48.6% 53.9% 34.5%
QFTG positive and active TB / active TB with QFTG result 0/2 0/2 0/0
0.0% 0.0% 0.0%
QFTG positive and high household risk / high household risk with QFTG result 35/66 26/46 9/20
53.0% 56.5% 45%
QFTG positive and home contactd/ home contact with QFTG result 57/150 41/97 16/53
38.0% 42.3% 30.2%
QFTG pos & symptoms/ symptoms with QFTG results 19/37 15/27 4/10
51.4% 55.6% 40.0%
Immune responsee & symptoms with chest-x-ray done/Immune response & symptoms 13/22 10/15 3/7
59.1% 66.7% 42.9%
  1. Abbreviations: IC SS + index case has positive sputum smear microscopy, LTBI Latent Tuberculosis Infection, TB tuberculosis, TST tuberculin skin test, QTFG Quantiferon-TB gold plus test
  2. a Latent TB infection: tested for immune response for TB infection (QuantiFERON positive, or TST when QuantiFERON not available) with positive result and not diagnosed as active TB
  3. b Tuberculosis infection: as diagnosed by Doctor based on bacteriological and/or clinical symptoms
  4. c Tuberculin skin test; 5 mm or more considered reactive (positive)
  5. d Home contacts are those who live in the same household as the index case
  6. e Immune response is positive QuantiFERON. When QTFG not available, TST is used