Streptococcus tigurinus
Description is based on API 20 Strep, API 50 CH and Rapid ID 32 STREP results.
The strain ATCC 15914 was originally identified as
S. mitis.

Positive results for  leucine aminopeptidase, alanyl-phenylalanyl-proline arylamidase, acid production from: D-fructose, D-galactose,
D-glucose, lactose, D-mannose, maltose, pullulan, raffinose, starch & sucrose.

Negative results for alkaline phosphatase, arginine hydrolysis, catalase, alpha-D-galactosidase, esculin hydrolysis, pyrrolidonyl
arylamidase, beta-glucuronidase, beta-glucosidase, hippurate hydrolysis, pyroglutamic acid arylamidase, beta-mannosidase,
urease, glycyl-tryptophan arylamidase, N-acetyl-beta-glucosaminidase, acid production from: arabinose, arabitol, alpha-cyclodextrin,
glycogen, inulin, D-mannitol, melibiose, melezitose, methyl beta-D-glucopyranoside, D-ribose, D-sorbitol & D-tagatose.

Trehalose fermentation is variable. Beta-D-galactosidase production depends on the substrate.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus tigurinus
Zbinden et al. 2012.

Jensen et al. 2016 proposed the reclasification of
Streptococcus tigurinus as Streptococcus oralis subsp. tigurinus comb. nov.
Gram-positive cocci, 0.5-1.0 μm in diameter, occurring in chains. Nonmotile.
Nonspore-forming.
Colonies on sheep blood agar are circular, smooth, white to greyish, convex,
alpha-hemolytic and 0.5-1.0 mm in diameter after 24 h of incubation at 37 ºC in
aerobic atmosphere. Facultatively anaerobic; no enhancement of growth in 5 % CO
2.
Growth occurs at 25-42 ºC but not in 6.5 % NaCl medium.
Isolated from human clinical samples.
Unknown; isolated from blood cultures of patients with endocarditis, meningitis and spondylodiscitis.
  1. Andrea Zbinden,  Nicolas J. Mueller,  Philip E. Tarr,  Cathrin Spröer,  Peter M. Keller, Guido V. Bloemberg. Streptococcus tigurinus
    sp. nov., isolated from blood of patients with endocarditis, meningitis and spondylodiscitis. Int J Syst Evol Microbiol, December
    2012 62: 2941-294.
  2. Jensen A, Scholz CF, Kilian M. Re-evaluation of the taxonomy of the Mitis group of the genus Streptococcus based on whole
    genome phylogenetic analyses, and proposed reclassification of Streptococcus dentisani as Streptococcus oralis subsp.
    dentisani comb. nov., Streptococcus tigurinus as Streptococcus oralis subsp. tigurinus comb. nov., and Streptococcus
    oligofermentans as a later synonym of Streptococcus cristatus. Int J Syst Evol Microbiol 2016; 66:4803-4820.
(c) Costin Stoica
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