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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Streptococcus dysgalactiae subsp. equisimilis
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: resembling Streptococcus equi.
Significance:  [Very important]   
Alternative Species Name(s):S. equisimilis
Taxonomy:
Phylum
Bacillota
Class
Bacilli
Order
Lactobacillales
Family
Streptococcaceae 
Genus
Streptococcus
Type Strain: CCUG 36637 och 36913
Macromorphology (smell):
   
Small (about 1 mm in diameter) transluscent colonies after incubation for 24 h at 37°C on blood agar. Give (clear) beta-hemolysis on bovine blood agar.
Micromorphology: Nonmotile cocci in chains
Gram +/Gram -:G+
Metabolism: Facultatively anaerobic
Catalase/Oxidase:-/-
Other Enzymes: Esculinase v, hippurikcase v
Biochemical Tests: Voges-Proskauer -
Fermentation of carbohydrates:
D-glucose
+
lactose
v
maltose
+
L-rhamnose
?
sucrose
+
L-arabinose
-
cellobiose
?
D-mannitol
-
salicin
?
trehalose
+
glycerol
v
inulin
-
raffinose
-
D-sorbitol
-
starch
+
Other carbohydrates: Amygdalin ?, ribose +.
Spec. Char.:
Special Media:
Streptococcus dysgalactiae  
Disease:
HostsDiseaseClinical picture
HorseUpper airway diseases, abscesses, endometritis, mastitis,Coughing, increased serous fluid
PigArthritis, endocarditis and meningitisOpportunistic, mainly affect piglets 1-3 weeks, joint swelling. lameness, increased temperatures and inappetence
HumansPharyngitis, skin and soft-tissue infections, cellulitis and severe invasive infections (elderly people)Inflammation in several different types of tissues
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_012891 GGS_124 2 106 340 1l + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AJ319643 ATCC 35666 1 458 

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 A, C, G or L streptcocci.
Updated:2023-08-11

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