TABLE 5.
Potentially useful tests included in the Crystal system for identifying unusual gram-positive cocci
| Species | % Strains positivea with:
|
|||||||
|---|---|---|---|---|---|---|---|---|
| FPR | FPY | FTR | MAL | AGN | MTT | BGL | PPG | |
| A. otitidis | 12 (v) | 88 (+) | 100 (+) | — (−) | — (−) | — (−) | — (−) | 25 (v) |
| D. pigrum | 12 (v) | 88 (+) | 100 (+) | 64 (v) | 64 (v) | 52 (v) | 97 (+) | 55 (v) |
| F. hominis | 100 (+) | — (−) | 100 (+) | 25 (v) | 25 (v) | 25 (v) | — (−) | 100 (+) |
| F. ignava | 60 (v) | 20 (v) | 100 (+) | 40 (v) | 40 (v) | 40 (v) | 25 (v) | 40 (v) |
| F. languida | — (−) | 67 (v) | 100 (+) | — (−) | — (−) | — (−) | — (−) | — (−) |
| F. sourekii | — (−) | 100 (+) | 33 (v) | 33 (v) | — (−) | — (−) | 100 (+) | — (−) |
| F. tabacinasalis | 100 (+) | — (−) | — (−) | — (−) | — (−) | — (−) | 100 (+) | 100 (+) |
| I. ruoffiae | 33 (v) | 100 (+) | 67 (v) | 33 (v) | — (−) | 33 (v) | — (−) | — (−) |
a
The number given is the percentage of positive results for each strain; a positive (+), negative (−), or variable (v) reaction for each test interpretation is indicated in parentheses. Abbreviations: FPR, l-proline–AMC; FPY, l-pyroglutamic acid–AMC; FTR, l-trytophan–AMC, MAL, maltose; AGN, N-acetyl-d-glucosamine; MTT, maltotriose; BGL, p-n-p-β-d-glucoside; PPG, p-n-p-β-d-galactoside and p-n-α-d-galactoside. —, 0%.