Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Nocardiaceae, Genus
Rhodococcus, Rhodococcus hoagii Kämpfer, Dott, Martin and Glaeser 2014, comb. nov.
Historical synonyms: Corynebacterium hoagii (Morse 1912) Eberson 1918, Rhodococcus equi (Magnusson 1923) Goodfellow and
Alderson 1977 (Approved Lists 1980), type strain ATCC 25729= NCTC 1621, “Bacillus hoagii” Morse 1912.
Gram-positive rods, 0.8-1.0 / 1.0-3.0 µm, occurring singly; short forms show polar
staining, larger forms are barred and slightly club-shaped. Non-motile.
Colonies are small, pale pink, dull, on nutrient agar. In broth produce turbidity with
slight pink sediment. Litmus milk is slightly alkaline with pink sediment. Aerobic.
Grows at 30 ºC, optimum.
Isolated from human throat. Found as serial contaminant of cultures.
- Kämpfer P., Dott W., Martin K. and Glaeser S.P., 2014. Rhodococcus defluvii sp. nov., isolated from wastewater of a bioreactor and
formal proposal to reclassify [Corynebacterium hoagii] and Rhodococcus equi as Rhodococcus hoagii comb. nov. IJSEM 64, 755-
- Cummins C.S., Lelliott R.A. and Rogosa M., 1975. Genus Corynebacterium Lehmann and Neumann 1896 . In: Buchanan R.E.
and Gibbons N.E. (Editors), Bergey’s Manual of Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company,
Positive results for catalase, acid production from: glucose & sucrose.
Negative results for aesculin hydrolysis, gelatin hydrolysis, indole production, nitrate
reduction, urease, acid production from maltose.
(c) Costin Stoica