(Jorgensen) FC Harrison (1928)
Macroscopic morphology
Colonies on Sabouraud dextrose agar at 25°C are orange to pink to coral and are smooth to rugoid and dull to glistening.
Microscopic morphology
On cornmeal following 72 hours incubation at 25°C, only globose yeast cells are produced (2.5-10 µm in diameter) [1270].
Special notes
This isolate is urease positive, nitrate negative and has negative growth on cycloheximide or at 40°C. This isolate has been reported as perhaps the only isolate to cause human infection [1270]. Reports in the literature include aortic homograft endocarditis [1401] while FTL cultures have been recovered from blood. This species was incorrectly renamed to Rhodotorula rubra but this is not a valid species and the name reverted to R. mucilaginosa [220].
FTL* in vitro susceptibility data
| AMB | CAS | FLU | ITRA | VORI | KETO | POSA |
|---|---|---|---|---|---|---|
| 0.125 µg/ml=1 | 8.0 µg/ml=7 | >64 µg/ml=11 | 4.0 µg/ml=1 | 4.0 µg/ml=2 | 0.5 µg/ml=3 | 0.25 µg/ml=1 |
| 0.25 µg/ml=7 | >8.0 µg/ml=1 | 8.0 µg/ml=5 | 8.0 µg/ml=6 | 1.0 µg/ml=5 | 0.5 µg/ml=1 | |
| 0.5 µg/ml=4 | >8.0 µg/ml=1 | >8.0 µg/ml=1 | 2.0 µg/ml=1 | |||
| 1.0 µg/ml=1 |
| Drug/N | AMB/13 | CAS/8 | FLU/11 | ITRA/7 | POSA/3 | VORI/9 | KETO/5 |
|---|---|---|---|---|---|---|---|
| MIC Range | 0.125-1.0 | 8.0->8.0 | >64 | 4.0->8.0 | 0.25->2.0 | 4.0->8.0 | 0.5-1.0 |
| MIC50 | 0.25 | * | >64 | * | * | * |
* Fungus Testing Laboratory unpublished data (CLSI M27-A2)