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. 2002 Sep;40(9):3291–3295. doi: 10.1128/JCM.40.9.3291-3295.2002

TABLE 2.

Discrepant and indeterminate results of VITEK 2 tests compared to the results of the mecA PCR

Identification mecA PCR resulta Oxacillin MIC (μg/ml)
Susceptibility by oxacillin resistance testb
Initial test Retest Initial test Retest
S. kloosii ≥8 ≥8 R R
S. saprophyticus 4 4 S S
S. saprophyticus 2 2 S S
S. saprophyticus 2 1 S S
S. saprophyticus 1 0.5 S S
S. saprophyticus 1 2 S S
S. saprophyticus ≤0.5 0.5 S S
S. cohnii 2 2 S S
S. cohnii 2 2 S S
S. xylosus 1 0.5 S S
S. lugdunensis 1 1 S S
S. lugdunensis 1 0.5 S S
S. lugdunensis ≤0.5 0.5 S S
S. lugdunensis ≤0.5 0.5 S S
S. epidermidis 2 2 S S
S. epidermidis + 1 2 S S
S. hominis + ≤0.5 0.5 S S
S. haemolyticus + ≤0.5 ≤0.25 S S
S. saprophyticus + No growth ≥8 No growth R
S. saprophyticus + No growth No growth No growth No growth
S. epidermidis No growth ≤0.5 No growth S
a

+, positive; −, negative.

b

S, susceptible; R, resistant.