Streptococcus didelphis
Isolated from the lungs, spleen, kidney and liver of diseased opossums with suppurative dermatitis and hepatic fibrosis.
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Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus didelphis  
Rurangirwa et al. 2000.
Non-groupable with Lancefield antisera.
Gram-positive cocci, nonsporulated, nonmotile, grouped in chains.
Colonies on 5% sheep blood Columbia agar are beta-haemolytic small and
translucent. Does not grow on MacConkey agar.
Growth temperature 37 ºC. Facultatively anaerobic.
Isolated from opossums (Didelphis virginiana).
  1. Fred R. Rurangirwa, Charlene A. Teitzel, Jing Cui, Dorothy M. French, Patrick L. McDonough  and Thomas Besser: Streptococcus
    didelphis sp. nov., a streptococcus with marked catalase activity isolated from opossums (Didelphis virginiana) with suppurative
    dermatitis and liver fibrosis. IJSEM (2000), 50, 759–765.
  2. Robert A. Whiley and Jeremy M. Hardie, 2009. Genus I. Streptococcus Rosenbach 1884, 22AL. In: (Eds.) P.D. Vos, G. Garrity, D.
    Jones, N.R. Krieg, W. Ludwig, F.A. Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3:
    The Firmicutes, Springer, 655-711.
(Tests were performed on API 20 Strep commercial kit with the exception of catalase)

Positive for catalase (unusual character for streptococci; lost after several subcultures), hippurate hydrolysis, beta-glucuronidase,
alkaline phosphatase, leucine arylamidase, arginine dihydrolase, acid production from: ribose, and trehalose.

Negative for acetoin production, beta-glucosidase (esculin hydrolysis), pydrrolidonyl arylamidase, alpha-galactosidase,
beta-galactosidase, acid production from: L-arabinose, glycogen, inulin, lactose, mannitol, raffinose, salicin, and sorbitol.

Variable results for alpha-galactosidase and acid production from starch.
(c) Costin Stoica
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