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Table 1 Comparison of Gram and AO stain in the direct microscopic examination of CSF specimens (n = 387)

From: Comparison of acridine orange fluorescent microscopy and gram stain light microscopy for the rapid detection of bacteria in cerebrospinal fluid

Gram stained smear microscopy results versus culture results
Gram’s stainCultureSensitivitySpecificityPredictive value
PosNegPosNeg
Pos25078.12%100%100%98.06%
Neg7355
AO stained smear microscopy results versus culture results
AO stainCultureSensitivitySpecificityPredictive value
PosNegPosNeg
Pos31496.88%98.87%88.57%99.70%
Neg1351