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Table 6 Comparison of ZN and CS methods for detection and grading of AFB in second-spot sputum specimens

From: Comparative evaluation of a two-reagent cold stain method with Ziehl-Nelseen method for pulmonary tuberculosis diagnosis

ZN; no. (%)/23
  Grade 3+ 2+ 1+ Scanty Negative Total
  3+ 5(1.4) 1(0.3) 0(0) 0(0) 0(0) 6(1.7)
  2+ 2(0.6) 7(1.9) 0(0) 0(0) 0(0) 9(2.5)
CS/23 1+ 0(0) 2(0.6) 5(1.4) 0(0) 0(0) 7(1.9)
  Scanty 0(0) 0(0) 0(0) 1(0.3) 0(0) 1(0.3)
  Negative 0(0) 0(0) 0(0) 0(0) 339(93.6) 339(93.6)
  Total 7(1.9) 10(2.8) 5(1.4) 1(0.3) 339(93.6) 362(100)