TABLE 1.
Presence of genes in the ica operon and results of qualititative (CRA) and quantitative (microtiter plate) assays for biofilm production
| Species(no. of strains) | No. (%) of strains positive
|
Geometric mean OD490 (95% CI) in the microtiter plate assay for the following strainsa:
|
|||||
|---|---|---|---|---|---|---|---|
| For icaA, icaB, icaC, and icaD | For icaC and icaD | CRA test | icaCD negative | icaCD positive | CRA test negative | CRA test positive | |
| S. epidermidis (122) | 49 (40) | 49 (40) | 29 (24) | 0.07 (0.04-0.10) | 0.22b (0.16-0.30) | 0.09 (0.06-0.13) | 0.22c (0.15-0.36) |
| S. capitis (29) | 0 | 12 (41) | 12 (41) | 0.03 (−0.01-0.08) | 0.01 (−0.04-0.06) | 0.02 (−0.01-0.06) | 0.02 (−0.04-0.9) |
| S. haemolyticus (11) | 0 | 0 | 0 | 0.01 (−0.04-0.09) | 0.01 (−0.04-0.09) | ||
| S. hominis (9) | 0 | 0 | 4 (44) | 0.02 (−0.03-0.08) | 0.05 (−0.2-0.13) | −0.01 (−0.10-0.17) | |
| S. warneri (8) | 0 | 0 | 0 | 0.07 (−0.01-0.16) | 0.07 (−0.01-0.16) | ||
| S. auricularis (1) | 0 | 0 | 0 | 0.01 | 0.01 | ||
a
OD490, optical density at 490 nm; CI, confidence interval.
b
The P value was <0.0001 in a comparison with the icaCD-negative group.
c
The P value was 0.0005 in a comparison with the CRA test-negative group.