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 absent S. aureus, sensitive S. epidermidis, not tested S. hominis, not testedFN S. aureus
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. epidermidis, sensitive S. epidermidis, resistant FN
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. capitis, sensitive S. pettenkoferi, resistant FN
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. capitis, sensitive S. epidermidis, no growth
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. epidermidis, sensitive S. haemolyticus, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. epidermidis, sensitive S. capitis, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. epidermidis, sensitive S. warneri, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA absent S. hominis, sensitive S. capitis, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA present S. capitis, sensitive S. epidermidis, resistant
    Staph species other than S. aureus or S. lugdunensis, mecA present S. hominis, resistant S. epidermidis, resistant
    Staph species other than S. aureus or S. lugdunensis, mecA present S. hominis, resistant S. epidermidis, resistant
    Staph species other than S. aureus or S. lugdunensis, mecA present S. hominis, resistant S. capitis, sensitive
    Staph species other than S. aureus or S. lugdunensis, mecA present S. epidermidis, resistant S. haemolyticus, sensitive
Polymicrobial specimens for Staph ID/R BCP in mixed Staphylococcus infections
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA absent S. epidermidis, sensitive FP S. aureus
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA present S. hominis, resistant FP S. aureus
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA present S. aureus, sensitive FP mixedFP
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA present S. epidermidis, resistant FP S. aureus
Polymicrobial specimens for both Staph ID/R BCP and conventional methods
    S. aureus in mixed Staph infection (not S. lugdunensis), mecA present S. aureus, sensitive S. epidermidis, resistant
  • a FN, false negative; FP, false positive; Staph, Staphylococcus.