Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus massiliensis
Glazunova et al. 2006. Lancefield group G.
Gram-positive cocci, 0.3-0.7 μm in diameter, nonsporulated, nonmotile, grouped in
pairs or short chains.
Colonies on sheep-blood agar are circular, white to greyish, shiny, convex,
non-hemolytic and 1-2 mm in diameter after 48 h at 37 ºC in CO2 - enriched
atmosphere. Growth also occurs in aerobic, microaerophilic and anaerobic
atmospheres. Optimum growth temperature is 37 ºC but growth is observed at 25-37
ºC. Growth occurs in the presence of 2% NaCl.
Isolated from human blood sample. Resistant to optochine.
- Olga O. Glazunova, Didier Raoult and Veronique Roux; Streptococcus massiliensis sp. nov., isolated from a patient blood culture.
IJSEM May 2006 vol. 56 no. 5 1127-1131.
Positive for hippurate hydrolysis, arginine dihydrolase, leucine aminopeptidase, alanyl-
phenylalanylproline arylamidase, glycyl-tryptophan arylamidase alkaline phosphatase,
acid production from maltose.
Negative for catalase, acetoin production, beta-glucosidase, beta-galactosidase, beta-glucuronidase, alpha-galactosidase,
urease, pyrrolidonyl arylamidase, N-acetyl-beta-glucosaminidase, beta-mannosidase, acid production from: arabinose, mannitol,
sorbitol, lactose, trehalose, inulin, raffinose, glycogen, sucrose, pullulan, tagatose, methyl beta-D-glucopyranoside, melibiose, ribose,
starch & melezitose.
(c) Costin Stoica