TABLE 1.
Characteristicsa useful in differentiating A. radicidentis from other catalase-positive or catalase-variable Actinomyces speciesb
| Species | Catalase | Nitrate reduction | Hydrolysis of:
|
Fermentation of:
|
Production ofc:
|
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Aesculin | Gelatin | Urea | d-Ara | l-Ara | Glu | Man | Suc | d-Xyl | Mel | Gly | Pull | Rib | Tre | PAL | PYZ | β-GLU | β-NAG | |||
| Actinomyces radicidentis | + | V | + | W | V | − | − | + | + | + | − | + | − | − | + | + | − | + | + | − |
| Actinomyces bowdenii | + | + | + | − | − | − | − | + | − | + | − | + | − | − | + | + | V (−) | V | + (W) | − |
| Actinomyces canis | + | − | − | − | − | − | + | + | − | V | + | − | + | + | + | − | − | + (W) | − | + |
| Actinomyces hordeovulneris | + (W) | − | + | W | − | − | V | + | − | + | + | − | V | + | V | V | − | V | V | + |
| Actinomyces howellii | + | − | + | − | − | − | − | + | − | + | + | V | − | − | − | V | + | + | + | + |
| Actinomyces naeslundii (serotype I) | V (−) | + | V (+) | V (−) | W | − | − | V (+) | V (−) | V (+) | V (−) | V (−) | − | − | − | + | − | + | + | − |
| Actinomyces naeslundii (serotype II) | V (−) | + | V | − | W | − | − | + | − | + | − | + | − | − | − | + | + (W) | + | + | − |
| Actinomyces neuii subsp. anitratus | + | − | − | − | − | + | − | + | + | + | V (+) | + | − | − | + | + | V | + | − | − |
| Actinomyces neuii subsp. neuii | + | + | − | − | − | + | − | + | + | + | + | V | − | − | V | V | − | + | − | − |
| Actinomyces slackii | + | + | + | V | V (−) | − | − | + | − | V | + | + | − | − | − | + | − | V | + | − |
| Actinomyces viscosus (serotype I) | + | + | + | − | V | − | − | + | − | + | − | − | − | − | − | V | + | − | + | − |
| Actinomyces viscosus (serotype II) | + | + | + | − | V | − | − | + | − | + | − | V | − | − | − | V | + | + | + | − |
| Arcanobacterium phocae | V (+) | − | − | − | − | − | − | + | V (+) | + | V (−) | V (+) | + | − | + | V | + | + | − | − |
a
Tests performed using commercial API systems, as described in the text. +, positive; −, negative; W, weak reaction; V, variable; V (+), most strains positive; V (−), most strains negative.
b
d-Ara, d-arabitol; l-Ara, l-arabinose; Glu, glucose; Man, mannitol; Mel, melezitose; Suc, sucrose; d-Xyl, d-xylose; Gly, glycogen; Pull, pullulan; Rib, ribose; Tre, trehalose.
c
PAL, alkaline phosphatase; PYZ, pyrazinamidase; β-GLU, β-glucosidase; β-NAG, β-N-acetylglucosaminidase.