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Table 1 Performance of Ziehl-Neelsen (ZN), Magnetic bead-FM (fluorescence microscopy) and Concentrated FM compared with culture on MGIT 960 and Lowenstein-Jensen medium

From: Feasibility of magnetic bead technology for concentration of mycobacteria in sputum prior to fluorescence microscopy

   Culture (MGIT + LJ)
   Positive Negative Total
Direct ZN
  Positive 55 2 57
  Negative 52 173 225
  Total 107 175 282
Magnetic bead FM
  Positive 70 20 90
  Negative 37 155 192
  Total 107 175 282
Concentrated FM
  Positive 80 10 89
  Negative 27 165 193
  Total 107 175 282
Direct FM
  Positive 63 1 64
  Negative 44 174 218
  Total 107 175 282
  1. MGIT, mycobacterial growth indicator tube
  2. LJ, Lowenstein-Jensen medium
  3. FM, fluorescence microscopy
  4. ZN, Ziehl-Neelsen