TABLE 4.

Performance of Portrait Staph ID/R BCP and/or conventional methods for polymicrobial specimens^a

Staph ID/R species ID, mecA results	Conventional method species ID, cefoxitin susceptibility results			Discrepant result
				Species ID	mecA
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 tested	FN 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 mixed	FP
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

^aFN, false negative; FP, false positive; Staph, Staphylococcus.