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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Streptococcus uberis
Category: Causes hemolysis
Etymology: Genus name: twisted (like a chain) coccus (coccus means a grain or a berry and referrs to any spherical microorganism)
Species epithet: of an udder.
Significance:In Sweden, the proportion of S. uberis -induced acute clinical mastitis constituted 11% over the past 10 years.
  [Very important]   
Taxonomy:
Phylum
Firmicutes
Class
Bacilli
Order
Lactobacillales
Family
Streptococcaceae 
Genus
Streptococcus
Type Strain: ATCC 19436 = CCUG 17930 och 27579 = NCTC 3858.
Macromorphology (smell):
   
Small (about 1 mm in diameter) transluscent ond circular colonies with smoth edge after incubation for 24 h at 37°C on blood agar. Gives no hemolysis (referred to as gamma-hemolysis) on blodagar. Some strains may cause alpha-hemolysis.
Micromorphology: Nonmotile cocci (less than 2 µm in diameter) in chains or pairs. The chains are often longer if the bacteria originate from a fluid culture.
Gram +/Gram -:
 
G+
Metabolism: Facultatively anaerobic
Catalase/Oxidase:-/-
Other Enzymes: DNase -, esculinase +, hippuricase +, coagulase -
Biochemical Tests: Voges-Proskauer +
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+++-+
L-arabinosecellobioseD-mannitolsalicintrehalose
-++++
glycerolinulinraffinoseD-sorbitolstarch
-+-+v
Other carbohydrates: amygdalin +, ribose +
Microbiological tests:
Streptococcus uberis  
CAMP test negative.
Spec. Char.:
Special Media:
Streptococcus uberis  Streptococcus uberis  Streptococcus uberis  
SELMA- or SELMA Plus plates are used for cultivation of milk samples when mastitis is suspected.
Disease:
HostsDiseaseClinical picture
Cattle (cow)Mastitis (inflammation of the udder)Common cause of acute and subclinical mastitis, can proceed to chronic mastitis. Mostly environmental sources, but can also be contagious with spread udder to udder
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_012004 0140J 1 852 352 1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AB002526 ATCC 19436T 1 442 

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. uberis is closely related to S. porcinus.
Comment:Belongs to Lancefield's group NG (= non-groupable) streptcocci.
Reference(s): No. 7
Updated:2021-03-11

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