Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Faecalicoccus, Faecalicoccus
pleomorphus De Maesschalck et al. 2014.
Old synonym: Streptococcus pleomorphus Barnes et al. 1979.
Gram-positive, pleomorphic cocci, occurring singly, in pairs and short chains; size
and shape may vary considerably according to the medium and conditions of growth.
May become Gram-negative within 24 hours.
2 to 3 mm in diameter, circular, convex colonies, with an irregular edge. On VL blood
agar some strains may be weak beta-hemolytic. Growth in broth is flocculent.
Anaerobic, no growth occurring in air or air containing 10% CO2. No growth at 20 ºC,
good growth at 37 and 45 ºC.
Isolated from the intestines of birds (chickens, turkeys, ducks) and occasionally human faeces.
- Barnes (E.M.), Impey (C.S.), Stevens (B.J.H.) and Peel (J.L.): Steptococcus pleomorphus sp. nov.: an anaerobic streptococcus
isolated mainly from the caeca of birds. Journal of General Microbiology, 1977, 102, 45-53.
- Holt J.G., Krieg N.R., Sneath P.H.A., Staley J.T. and Williams S.T., 1994. Bergey's Manual of Determinative Bacteriology, Ninth
Edition, Williams & Wilkins, A Waverly Company, Baltimore, pp 527-558.
- EUZÉBY (J.P.): List of Bacterial Names with Standing in Nomenclature: a folder available on the Internet. Int. J. Syst. Bacteriol.,
1997, 47, 590-592. (List of Prokaryotic names with Standing in Nomenclature. https://www.bacterio.net).
Acid is produced from glucose, fructose and usually mannose.
Acid is not produced from arabinose, cellobiose, dextrin, galactose, inositol, lactose, maltose, mannitol, salicin, starch, sucrose &
Catalase-negative, gelatin is not liquefied, indole is not produced, nitrates are not reduced. H2S production is weak.
Glucose is fermented by homolactic fermentation to L-lactic acid. Gas is not produced. Small quantities of butyric, formic and
sometimes acetic and succinic acids may be produced.
(c) Costin Stoica