Table 4.
Detection of Gram-positive bacteria and resistance genes in simulated blood cultures by BC-GP.
| Organism | Total no. of strains | No. (%) of isolates | ||
|---|---|---|---|---|
| correctly identified | not detected | incorrectly identified | ||
| Staphylococcus | 54 | 54 (100) | ||
| S. aureus | 35 | 35 (100) | ||
| Methicillin-sensitive, mecA− | 15 | 15 (100) | ||
| Methicillin-resistant, mecA+ | 20 | 20 (100) | ||
| Health-care associated | 10 | 10 (100) | ||
| Community acquired | 10 | 10 (100) | ||
|
| ||||
| S. epidermidis | 1 | 1 (100) | ||
| Methicillin-sensitive, mecA− | 1 | 1 (100) | ||
|
| ||||
| S. lugdunensis | 8 | 8 (100) | ||
|
| ||||
| Other CNS | 10 | 10 (100) | ||
| S. hominis | 2 | 2 (100) | ||
| S. haemolyticus | 2 | 2 (100) | ||
| S. saprophyticus | 2 | 2 (100) | ||
| S. capitis | 1 | 1 (100) | ||
| S. cohnii | 1 | 1 (100) | ||
| S. warneri | 1 | 1 (100) | ||
| S. pseudintermedius | 1 | 1 (100) | ||
|
| ||||
| Streptococcus | 87 | 77 (88) | 4 (5) | 6 (7) |
| S. pyogenes | 9 | 8 (89) | 1 (11)a | |
| S. agalactiae | 8 | 8 (100) | ||
| S. dysgalactiae | 8 | 8 (100) | ||
| S. anginosus groupb | 10 | 8 (80) | 2 (20) | |
| S. anginosus | 3 | 2 (66) | 1 (34)c | |
| S. constellatus | 4 | 3 (75) | 1 (25)c | |
| S. intermedius | 3 | 3 (100) | ||
| S. pneumoniae | 22 | 20 (91) | 2 (9)d | |
| Other streptococci | 30 | 25 (86) | 3 (10) | 2 (7) |
| S. mitis | 12 | 9 (75) | 1 (8) | 2 (17)e |
| S. oralis | 4 | 4 (100) | ||
| S. infantis | 2 | 2 (100) | ||
| S. mutans | 2 | 1 (50) | 1 (50) | |
| S. sobrinus | 1 | 0 (0) | 1 (100) | |
| S. sanguinis | 1 | 1 (100) | ∖ | |
| S. parasanguinis | 1 | 1 (100) | ||
| S. peroris | 1 | 1 (100) | ||
| S. australis | 1 | 1 (100) | ||
| S. tigurinus | 1 | 1 (100) | ||
| S. cristatus | 1 | 1 (100) | ||
| S. gordonii | 1 | 1 (100) | ||
| S. gallolyticus | 1 | 1 (100) | ||
| S. lutetiensis | 1 | 1 (100) | ||
|
| ||||
| Enterococcus | 57 | 57 (100) | ||
| E. faecalis | 32 | 32 (100) | ||
| Vancomycin-sensitive | 18 | 18 (100) | ||
| Vancomycin-resistant, vanA+ | 4 | 4 (100) | ||
| Vancomycin-resistant, vanB+ | 10 | 10 (100) | ||
| E. faecium | 25 | 25 (100) | ||
| Vancomycin-sensitive | 5 | 5 (100) | ||
| Vancomycin-resistant, vanA+ | 10 | 10 (100) | ||
| Vancomycin-resistant, vanB+ | 10 | 10 (100) | ||
|
| ||||
| Listeria spp. | 5 | 5 (100) | ||
|
| ||||
| Micrococcus spp. | 5 | 5 (100) | ||
|
| ||||
| Total | 208 | 198 (95) | 4 (2) | 6 (3) |
aNot detected initially, but positive using 11-fold diluted blood culture sample.
b Streptococcus sp. belonging to the S. anginosus group is identified as S. anginosus group by BC-GP.
cPositive signal for Streptococcus, but no signal for S. anginosus group.
dPositive signal for Streptococcus, but no signal for S. pneumoniae.
eMisidentified as S. pneumoniae.