TABLE 3.

Summary of sensitivities and specificities of several automated bacterial identification systems tested with food-borne pathogens

Pathogen and system	% Sensitivitya	% Specificityb
Listeria species
WalkAway 40	100	100
MIS	90	100
VITEK	97.5	100
MicroLog	97.5	100
S. aureus
WalkAway 40	97.5	100
MIS	47.5	100
VITEK	95	95
B. cereus
MIS	55	97.5
VITEK	42.5	97.5
C. jejuni, MIS	72.5	32.5
Salmonella species
WalkAway 40	97.5	100
MIS	85	100
VITEK	100	100
Replianalyzer	95	100
MicroLog	95	100
E. coli
WalkAway 40	100	100
MIS	52.5	97.5
VITEK	100	97.5
Replianalyzer	90	100
MicroLog	72.5	100

^aProportion of reference positive strains which were correctly identified with an acceptable confidence rating. 

^bProportion of reference negative strains which were not identified as the pathogen of concern with an acceptable confidence rating.