Legend: + positive, - negative, w weakly positive.
Differential characters between R. dentocariosa type species and genomovar II (R. aeria):
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| Rothia dentocariosa |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinomycetota, Class Actinomycetes, Order Micrococcales, Family Micrococcaceae, Genus Rothia, Rothia dentocariosa
corrig. (Onishi 1949) Georg and Brown 1967, type species of the genus.
Old synonyms: Rothia dentocariosus (Onishi 1949) Georg and Brown 1967,
Actinomyces dentocariosus Onishi 1949, Nocardia dentocariosus (Onisi) Roth
1957, Nocardia salivae Davis and Freer 1960.
Genomovar II strains are now included in Rothia aeria species.
corrig. (Onishi 1949) Georg and Brown 1967, type species of the genus.
Old synonyms: Rothia dentocariosus (Onishi 1949) Georg and Brown 1967,
Actinomyces dentocariosus Onishi 1949, Nocardia dentocariosus (Onisi) Roth
1957, Nocardia salivae Davis and Freer 1960.
Genomovar II strains are now included in Rothia aeria species.
Gram-positive coccoid, diphteroid, filamentous or mycelial. Produces a mycelium
composed of branched filaments, often with clavate ends (1 µm or less in diameter)
which fragment readily into bacillary and coccoid forms. No aerial hyphae or spores
are produced. Non-acid fast. Non-motile.
composed of branched filaments, often with clavate ends (1 µm or less in diameter)
which fragment readily into bacillary and coccoid forms. No aerial hyphae or spores
are produced. Non-acid fast. Non-motile.
Colonies whether rough or smooth (R or S) are creamy white, entire, and of soft texture. In broth there is usually a mixture of soft,
turbid, and finely granular or floccose growth. Optimum growth temperature is 35-37 ºC. Aerobic to microaerophilic; very poor growth
or none anaerobically. Nonhemolytic on human and sheep blood, variable on rabbit blood.
Can grow in 5% NaCl, 10% bile 0.01% potassium tellurite, 0.005% sodium azide, 0.01% sodium selenite, and 0.02% taurocholate.
No growth in 0.05% crystal violet.
turbid, and finely granular or floccose growth. Optimum growth temperature is 35-37 ºC. Aerobic to microaerophilic; very poor growth
or none anaerobically. Nonhemolytic on human and sheep blood, variable on rabbit blood.
Can grow in 5% NaCl, 10% bile 0.01% potassium tellurite, 0.005% sodium azide, 0.01% sodium selenite, and 0.02% taurocholate.
No growth in 0.05% crystal violet.
Habitat: oral cavity of man.
Isolated from carious dentine in humans. Associated with dental plaque and periodontal disease. Opportunisic pathogen
asssociated with endocarditis, endophtalmitis, tonsilitis, and pneumonia in immunocompromised patients.
Pathogenicity not demonstrated in experimental animals.
asssociated with endocarditis, endophtalmitis, tonsilitis, and pneumonia in immunocompromised patients.
Pathogenicity not demonstrated in experimental animals.
- Georg LK, Brown JM. Rothia, gen. nov., an aerobic genus of the family Actinomycetaceae. International Journal of Systematic
Bacteriology 1967; 17:79-88. - Hans-Jurgen Busse, 2012. Family I. Micrococcaceae Pribham 1929, 361 AL emend. Stackebrandt, Rainey and Ward-Rainey 1997,
479 in: Bergey’s Manual of Systematic Bacteriology, second edition, Volume Five The Actinobacteria, Part A, Springer, 571-666. - Goodfellow, M., T.M. Embley and B. Austin. 1985. Numerical taxonomy and emended description of Renibacterium salmoninarum.
J. Gen. Microbiol. 131: 2739-2752. - Li Y, Kawamura Y, Fujiwara N, Naka T, Liu H, Huang X, Kobayashi K, Ezaki T. Rothia aeria sp. nov., Rhodococcus baikonurensis sp.
nov. and Arthrobacter russicus sp. nov., isolated from air in the Russian space laboratory Mir. Int J Syst Evol Microbiol 2004; 54:827-
835.
Positive results for catalase, DNase, esculin hydrolysis, gelatin liquefaction (usually), alpha- and beta-glucosidase, nitrate and nitrite
reduction, leucine aminopeptidase, Voges-Proskauer test, acid production from fructose, glycerol (weak), glucose, maltose, ribose,
salicin, sucrose, and trehalose.
Negative results for acid and alkaline phosphatase, albumin hydrolysis, casein hydrolysis, chemotrypsin, alpha- and
beta-galactosidase, beta-glucuronidase, indole production, lipase C14, litmus milk test, alpha-mannosidase, oxidase, starch
hydrolysis, trypsin, urease, acid production from adonitol, amygdalin, cellobiose, dulcitol, erythritol, galactose, glycogen, inositol,
inulin, mannitol, lactose, melibiose, raffinose, salicin, sorbitol, starch, and xylose.
reduction, leucine aminopeptidase, Voges-Proskauer test, acid production from fructose, glycerol (weak), glucose, maltose, ribose,
salicin, sucrose, and trehalose.
Negative results for acid and alkaline phosphatase, albumin hydrolysis, casein hydrolysis, chemotrypsin, alpha- and
beta-galactosidase, beta-glucuronidase, indole production, lipase C14, litmus milk test, alpha-mannosidase, oxidase, starch
hydrolysis, trypsin, urease, acid production from adonitol, amygdalin, cellobiose, dulcitol, erythritol, galactose, glycogen, inositol,
inulin, mannitol, lactose, melibiose, raffinose, salicin, sorbitol, starch, and xylose.
(c) Costin Stoica
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