Table 1.
Performance of the BC-GP assay at Toranomon Hospital.
| Organism | BC-GP (total) | BC-GP (monomicrobial cultures) | ||||||
|---|---|---|---|---|---|---|---|---|
| Number of organisms | Number (%) of isolates | Number of organisms | Number (%) of isolates | |||||
| Correctly identified | Not detected | Incorrectly identified | Correctly identified | Not detected | Incorrectly identified | |||
| Staphylococcus | 78 | 73 (94) | 4 (5) | 1 (1) | 71 | 70 (99) | 1 (2) | |
| S. aureus | 16 | 16 (100) | 16 | 16 (100) | ||||
| Methicillin-sensitive | 9 | 9 (100) | 9 | 9 (100) | ||||
| Methicillin-resistant | 7 | 7 (100) | 7 | 7 (100) | ||||
| S. epidermidis | 37 | 34 (92) | 2 (5) | 1 (3) | 34 | 34 (100) | ||
| Methicillin-sensitive | 2 | 1 (50) | 1 (50)a | 1 | 1 (100) | |||
| Methicillin-resistant | 35 | 33 (94) | 1 (3)b | 1 (3)c | 33 | 33 (100) | ||
| S. lugdunensis | 1 | 1 (100) | 1 | 1 (100) | ||||
| Other CNS | 24 | 22 (92) | 2 (8) | 20 | 19 (95) | 1 (6) | ||
| S. caprae | 9 | 8 (89) | 1 (11) | 7 | 6 (67) | 1 (33) | ||
| S. hominis | 8 | 8 (100) | 7 | 7 (100) | ||||
| S. haemolyticus | 4 | 3 (75) | 1 (25)d | 3 | 3 (100) | |||
| S. capitis | 1 | 1 (100) | 1 | 1 (100) | ||||
| S. schleiferi | 1 | 1 (100) | 1 | 1 (100) | ||||
| S. simulans | 1 | 1 (100) | 1 | 1 (100) | ||||
|
| ||||||||
| Streptococcus | 9 | 7 (78) | 1 (11) | 1 (11) | 6 | 5 (83) | 1 (27) | |
| S. agalactiae | 1 | 1 (100) | 1 | 1 (100) | ||||
| S. anginosus group | 1 | 1 (100) | ||||||
| S. constellatus | 1 | 1 (100)e | ||||||
| Other streptococci | 7 | 5 (72) | 1 (14) | 1 (14) | 5 | 4 (80) | ||
| S. mitis | 2 | 1 (50) | 1 (50)f | 2 | 1 (50) | 1 (50)f | ||
| S. infantis | 2 | 1 (50) | 1 (50)g | 1 | 1 (100) | |||
| S. tigurinus | 2 | 2 (100) | 1 | 1 (100) | ||||
| S. oralis | 1 | 1 (100) | 1 | 1 (100) | ||||
|
| ||||||||
| Enterococcus | 17 | 16 (94) | 1 (6) | 16 | 16 (100) | |||
| E. faecalis | 2 | 1 (50) | 1 (50)h | 1 | 1 (100) | |||
| Vancomycin-sensitive | 2 | 1 (50) | 1 (50) | 1 | 1 (100) | |||
| E. faecium | 15 | 15 (100) | 15 | 15 (100) | ||||
| Vancomycin-sensitive | 15 | 15 (100) | 15 | 15 (100) | ||||
|
| ||||||||
| Total | 104 | 96 (92) | 6 (6) | 2 (2) | 93 | 91 (98) | 1 (1) | 1 (1) |
|
| ||||||||
| Other nontarget Gram-positives | 15 | 10 | ||||||
| Bacillus | 3 | 2 | ||||||
| B. subtilis | 2 | 1 | ||||||
| B. cereus | 1 | 1 | ||||||
| Corynebacterium | 12 | 8 | ||||||
| C. striatum | 9 | 5 | ||||||
| C. jeikeium | 3 | 3 | ||||||
|
| ||||||||
| Total isolates | 119 | 103 | ||||||
aPolymicrobial culture of methicillin-sensitive and methicillin-resistant S. epidermidis.
bPolymicrobial culture with E. faecium.
cCorrectly identified as Staphylococcus, but not as S. epidermidis, S. aureus, or S. lugdunensis.
dPolymicrobial culture with S. tigurinus.
e“S. anginosus group” identified by the BC-GP assay is defined as “correctly identified” for each species.
fIdentified as S. pneumoniae.
gPolymicrobial culture with methicillin-resistant S. epidermidis.
hPolymicrobial culture with Escherichia coli.