TABLE 1.
Colony identification performance by APAS compared with that of a reference panel
| Colony morphologies on blood agar | Examples of colony morphology | Sensitivity (%) | Specificity (%) |
|---|---|---|---|
| Coliform-like colonies | Escherichia coli | 98.9 | 83.9 |
| Swarming colonies | Proteus mirabilis | 97.2 | 99.9 |
| Granular Gram-negative colonies | Pseudomonas aeruginosa | 67.7 | 92.5 |
| Staphylococcus-like colonies | Staphylococcus spp. | 94 | 83.8 |
| Small beta-hemolytic colonies | Streptococcus agalactiae | 92.4 | 89.3 |
| Small colonies | Enterococci, lactobacilli, corynebacteria | 90 | 73.7 |
| Colony morphologies on MacConkey agar | |||
| Lactose fermenters | Escherichia coli | 99.2 | 98.1 |
| Non-lactose fermenters | Proteus spp. | 92.6 | 95.9 |