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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Staphylococcaceae => Gemella => Gemella morbillorum (Prévot 1933) Kilpper-Bälz and
Schleifer 1988.
Old synonyms: Diplococcus rubeolae Tunnicliff 1933, Streptococcus morbillorum (Prévot 1933) Holdeman and Moore 1974,
Diplococcus morbillorum Prévot 1933, Peptostreptococcus morbillorum (Prévot 1933) Smith 1957.
Schleifer 1988.
Old synonyms: Diplococcus rubeolae Tunnicliff 1933, Streptococcus morbillorum (Prévot 1933) Holdeman and Moore 1974,
Diplococcus morbillorum Prévot 1933, Peptostreptococcus morbillorum (Prévot 1933) Smith 1957.
Gram positive cocci (sometimes Gram variable), 0.3-0.8 / 0.5-1.4 μm, arranged in
short chains, pairs or single cells, nonsporing, nonmotile. Pleomorphism may be very
pronounced, coccal forms are frequently elongate, and cells may be of unequal size.
short chains, pairs or single cells, nonsporing, nonmotile. Pleomorphism may be very
pronounced, coccal forms are frequently elongate, and cells may be of unequal size.
Colonies on blood agar plates after 2 days are pinpoint to 0.5 mm in diameter,
circular, entire, convex, translucent, shiny, and smooth. Some strains are alpha
hemolytic. Anaerobic to aerotolerant, growth at 37.0 °C, no growth at 10 °C. Growth is
enhanced by fermentable carbohydrates, by the addition of Tween 80 to fluid media or
by CO2 enriched atmosphere.
Growth on : trypticase soy agar with defibrinated sheep blood, brain heart infusion
broth, RGCA (rumen-fluid-glucose-cellobiose agar).
circular, entire, convex, translucent, shiny, and smooth. Some strains are alpha
hemolytic. Anaerobic to aerotolerant, growth at 37.0 °C, no growth at 10 °C. Growth is
enhanced by fermentable carbohydrates, by the addition of Tween 80 to fluid media or
by CO2 enriched atmosphere.
Growth on : trypticase soy agar with defibrinated sheep blood, brain heart infusion
broth, RGCA (rumen-fluid-glucose-cellobiose agar).
Isolated from human clinical specimens and intestinal contents.
Usually is a commensal organisms of the upper respiratory (oropharyngeal) & gastrointestinal tract of humans, but may be involved
in nosocomial infections (peritonitis). Possible cause of abscesses, empyema, endocarditis, osteomyelitis and blood infections.
in nosocomial infections (peritonitis). Possible cause of abscesses, empyema, endocarditis, osteomyelitis and blood infections.
- Bergey’s Manual of Determinative Bacteriology, 9th ed., 1994.
- Kilpper-Balz R. & Schleifer K.H.: Transfer of Streptococcus morbillorum to the genus Gemella as Gemella morbillorum comb.
nov. Int. J. Syst. Bacteriol., 1988, 38, 442-443. - Armando Lopes; Rui Providencia; Rui Pedro Pais; Maria João Frade; Feres Chaddad Neto; Evandro de Oliveira: Cerebellar
abscess by Gemella morbillorum in a patient with inter-atrial communication. Arq. Neuro-Psiquiatr. vol.65 no.4a São Paulo
Dec. 2007. - Martin Dworkin, Stanley Falkow, Eugene Rosenberg, Karl-Heinz Schleifer, Erko Stackebrandt (Editors).: The Prokaryotes 3rd
ed.: A Handbook on the Biology of Bacteria Volume 4: Bacteria: Firmicutes, Cyanobacteria. 2006
Acid is produced from glucose. Acid is not produced from ribose, mannitol, cellobiose,
fructose, galactose, inulin, lactose, salicin, trehalose & raffinose.
Hippurate and esculin are not hydrolyzed. Nitrite is not reduced. VP, ADH, pyrrolidonearylamidase, alpha-Galactosidase,
beta-Glucuronidase, beta-Galactosidase, alkaline phosphatase negative.
fructose, galactose, inulin, lactose, salicin, trehalose & raffinose.
Hippurate and esculin are not hydrolyzed. Nitrite is not reduced. VP, ADH, pyrrolidonearylamidase, alpha-Galactosidase,
beta-Glucuronidase, beta-Galactosidase, alkaline phosphatase negative.
(c) Costin Stoica
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