TABLE 4

Performance of Portrait Staph ID/R BCP and/or conventional methods for polymicrobial specimensa

Staph ID/R species ID, mecA resultsConventional method species ID, cefoxitin susceptibility resultsDiscrepant result
Species IDmecA
Polymicrobial specimens for conventional methods
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. aureus, sensitiveS. epidermidis, not testedS. hominis, not testedFN S. aureus
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. epidermidis, sensitiveS. epidermidis, resistantFN
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. capitis, sensitiveS. pettenkoferi, resistantFN
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. capitis, sensitiveS. epidermidis, no growth
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. epidermidis, sensitiveS. haemolyticus, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. epidermidis, sensitiveS. capitis, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. epidermidis, sensitiveS. warneri, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA absentS. hominis, sensitiveS. capitis, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA presentS. capitis, sensitiveS. epidermidis, resistant
    Staph species other than S. aureus or S. lugdunensis, mecA presentS. hominis, resistantS. epidermidis, resistant
    Staph species other than S. aureus or S. lugdunensis, mecA presentS. hominis, resistantS. epidermidis, resistant
    Staph species other than S. aureus or S. lugdunensis, mecA presentS. hominis, resistantS. capitis, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA presentS. epidermidis, resistantS. haemolyticus, sensitive
Polymicrobial specimens for Staph ID/R BCP in mixed Staphylococcus infections
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA absentS. epidermidis, sensitiveFP S. aureus
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA presentS. hominis, resistantFP S. aureus
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA presentS. aureus, sensitiveFP mixedFP
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA presentS. epidermidis, resistantFP S. aureus
Polymicrobial specimens for both Staph ID/R BCP and conventional methods
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA presentS. aureus, sensitiveS. epidermidis, resistant
  • a FN, false negative; FP, false positive; Staph, Staphylococcus.