TABLE 2.

Performance of the bacteriophage-based LAT in comparison with that of the conventional LAT Pastorex for distinguishing S. aureus^a from CoNS^b

Method	% Sensitivity	% Specificity	% PPV	% NPV
Phage-based test	100	92.1	89.6	100
Pastorex	100	99.2	98.9	100

^an = 86.

^bn = 128. One S. epidermidis isolate, which caused nonspecific agglutination of test and control latex in both the phage-based test and Pastorex, was excluded from the analysis.