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Species/Subspecies: Streptococcus dysgalactiae subsp. dysgalactiae
Etymology: Genus name: twisted (like a chain) cocci (coccus means a grain or a berry and referrs to any spherical microorganism)
Species epithet: from loss of lactation
Subspecies epithet: see Species epithet.
Significance:  [Very important]   
Type Strain: ATCC 43078 = CCUG 27301
Macromorphology (smell):
Streptococcus dysgalactiae Streptococcus dysgalactiae 
Small (approximately 1 mm in diameter) transluscent colonies after incubation for 24 h at 37°C on blood agar. Gives a weak (greenish), alpha-hemolysis on blood agar.
Micromorphology: Nonmotile cocci in chains
Gram +/Gram -:
Fig 17:3. Gram staining of Streptococcus dysgalactiae subsp. dysgalactiae. The bacteria have not been evenly stained and the chains could be longer.
Metabolism: Facultatively anaerobic
Other Enzymes: Esculinase v, hippuricase -, coagulase -
Biochemical Tests: Voges-Proskauer -
Fermentation of carbohydrates:
Other carbohydrates: Amygdalin ?, ribose +.
Spec. Char.:
Special Media:
Streptococcus dysgalactiae Streptococcus dysgalactiae Streptococcus dysgalactiae 
SELMA- or SELMA Plus plates are used for cultivation of samples from suspected mastitis cases.
Hosts: Cattle, goat
Disease (Swedish):Smittsam mastit
Disease (English):Bovine mastitis
Clinical Picture:
16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AY584478 ATCC 43078T 1 471  

 Streptococcus dysgalactiae
About 100 species have been described within the genus Streptococcus. Many species within the genus Enterococcus have earlier been classified as streptococci and, thus, they are closely related. S. dysgalactiae is closely related to S. agalactiae.
Comment:Belongs to Lancefield's group C streptcocci.


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Swedish University of Agricultural Sciences