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Table 5 Sensitivity of direct ZN, concentrated FM and Magnetic bead-FM, as a function of reading time

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

Reading time Cumulative No. positive
slides
New positive
slides
Yield of new positives/total
positives* (%)
Direct ZN    
30 s 4 4 66.7%
1 min 4 0 0%
3 min 4 0 0%
5 min 6 2 33.3%
Concentrated FM    
30 s 12 12 63.2%
1 min 14 2 10.5%
3 min 19 5 26.3%
5 min 19 0 0%
Magnetic bead    
30 s 6 6 35.3%
1 min 11 5 29.4%
3 min 13 2 10.5%
5 min 17 4 23.5%
  1. *total number of slides positive by each method after 5 minutes examination time.