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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Streptococcus dysgalactiae subsp. dysgalactiae
Category: Causes hemolysis
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]   
Taxonomy:
Phylum
Firmicutes
Class
Bacilli
Order
Lactobacillales
Family
Streptococcaceae 
Genus
Streptococcus
Type Strain: ATCC 43078 = CCUG 27301
Macromorphology (smell):
   
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 -:
 
G+
Metabolism: Facultatively anaerobic
Catalase/Oxidase:-/-
Other Enzymes: Esculinase v, hippuricase -, coagulase -
Biochemical Tests: Voges-Proskauer -
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+v+?+
L-arabinosecellobioseD-mannitolsalicintrehalose
-?v?+
glycerolinulinraffinoseD-sorbitolstarch
v--v+
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.
Disease:
HostsDiseaseClinical picture
CattleMastitisVarying symptoms from severe clinical mastitis with fever and severe swelling, to subclinical mastitis without clinical symptoms. The bacterium can be spread both between cows and from the environment to the udder
Sheep (lambs) and goatArthritis, septicemia, meningitisPolyarthritis, most common cause of infectious arthritis in lambs aged up to four weeks
16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AY584478 ATCC 43078T 1 471  

Taxonomy/phylogeny:
 
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.
Updated:2021-02-19

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