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Table 3 Characteristics of TB index cases and their identified contacts, 2010–2018

From: International tuberculosis contact-tracing notifications in Germany: analysis of national data from 2010 to 2018 and implications for efficiency

 201020112012201320142015201620172018Total
Total number of index cases12148191026332941192
Index cases – demographic characteristics
 Sex (N = 98)Male2416471113856 (57.1%)
Female84113694642 (43.9%)
Unknown2661231313122794
 Median age23.031.541.535.531.029.031.531.055.031.0
 Nationality (region) (N = 48)Africa0001120116 (12.5%)
The Americas2100100004 (8.3%)
Asia0000022116 (12.5%)
Eastern Europe0000022228 (16.7%)
Western Europe01312543524 (50.0%)
Unknown1012517615252232144
Index cases – clinical characteristics
 Smear microscopy (N = 159)Positive12126151019252127147 (92.5%)
negative01140212112 (7.5%)
Unknown011005761333
 Culture (N = 102)Positive89313461791079 (77.5%)
Negative0000000000 (0.0%)
Pending01312335523 (22.5%)
Unknown442541713152690
 Chest X-ray (N = 109)Normal0010030105 (4.6%)
Abnormal25273476541 (37.6%)
Cavitary lesions7339441671063 (57.8%)
Unknown362241510152683
 Diagnosis (N = 119)Pan-sensitive TB71041051114121992 (77.3%)
Mono-resistant TB11030311111 (9.2%)
MDR-TB10011273015 (12.6%)
XDR-TB0000001001 (0.8%)
Unknown334541010132173
 Infectious during exposure (N = 115)Yes10661141218141899 (86.1%)
No12120215216 (13.9%)
Unknown161661214102177
 Symptoms during exposure (N = 81)Yes93342611111362 (76.5%)
No11021325419 (23.5%)
Unknown210513717201324111
Exposure Setting
 Type of exposure (N = 192)Flight contact1211613415232224130 (67.7%)
Private contact022344451539 (20.3%)
Work contact01021622216 (8.3%)
School- or education-related contact0001113006 (3.1%)
Ship contact0000001001 (0.5%)
Contact persons
 Total number of contact persons30885286488010418697771
 Child contacts0 (0.0%)3 (3.4%)7 (13.5%)0 (0.0%)1 (2.1%)2 (2.5%)6 (5.8%)5 (2.7%)8 (8.2%)32 (4.2%)
 Number of contact persons who could not be traced3 (0.1%)7 (8.0%)1 (1.9%)1 (1.2%)20 (4.2%)0 (0.0%)0 (0.0%)0 (0.0%)2 (2.1%)34 (4.4%)