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Table 1 (a) Overall diagnostic assay performance, (b) Xpert positivity per collection method, stratified by smear microscopy result of the TB cases

From: Mycobacterium tuberculosis detection from oral swabs with Xpert MTB/RIF ULTRA: a pilot study

  Mtb detection n/N Sensitivity (95% CI) Specificity (95% CI)
TB cases Controls
(a)
   15/33 0/26 45% (29–62) 100% (89–100)
Subgroup Lysis buffer
n/N
FTA
n/N
PBS
n/N
Combined
n/N
Sensitivity (95% CI) Specificity (95% CI)
(b)
 SM positive cases 6/10 4/10 4/9 14/29 48% (31–66)  
 SM negative cases 0/0 1/3 0/1 1/4 25% (1.2–76)  
 Controls 0/7 0/10 0/9 0/26   100% (89–100)
  1. SM smear