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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Bacillus cereus
Categories: Causes hemolysis; spore forming; motile
Etymology: Genus name: small rod
Species epithet: wax colored
Significance:  [Very important]   
Taxonomy:
Phylum
Firmicutes
Class
Bacilli
Order
Bacillales
Family
Bacillaceae 
Genus
Bacillus
Type Strain: ATCC 14579 = CCUG 7414 = NCTC 2599
Macromorphology (smell):
   
Large, opaque, grey-yellow, granular, flat colonies (diameter 5-10 mm). Most strains produce a clear broad zone of hemolysis on blood agar.
Micromorphology:
   
Large (1 x 5-10 µm) motile rods, centrally located endospores can sometimes be seen as uncolored regions after Gram staining of cells from older cultures. May form spores.
Gram +/Gram -:
 
G+ (Cells from older cultures can appear as G - because the cell wall degenerates)
Metabolism: Facultatively anaerobic
Catalase/Oxidase:+/-
Other Enzymes: Lecithinase +
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+-+-v
L-arabinosecellobioseD-mannitolsalicintrehalose
-v-(+)+
glycerolinulinraffinoseD-sorbitolstarch
+---(+)
Other carbohydrates: Fructose +, D-mannose -, ribose +, xylitol -.
Spec. Char.:
Special Media:
Bacillus cereus  
MYP agar is often used for confirmation of suspected B. cereus colonies from food samples.
Disease:Food poisoning, can occasionally be isolated from cattle with mastitis.
HostsDiseaseClinical picture
HumansFood poisoningThere are a vomiting type with short incubation (<6h) and a diarrhea type with a slightly longer incubation time (6-24h)
Cattle (cow)MastitisHave occasionally been associated with cases of mastitis.
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_006274 E33L 5 300 915  

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AE016877 (T) komplett 13 

Taxonomy/phylogeny:
 
About 250 species have been described within the genus Bacillus. B. cereus is very closely related to Bacillus anthracis and Bacillus thuringiensis.
Comment:Spore forming.
Reference(s): No. 111
Updated:2021-10-04

News

The revised taxonomy of the mollicutes

The revised taxonomy of mollicutes (mycoplasmas) has now been introduced on VetBact, which means that many of the species have been given new genus names or moved to another higher taxon. 

Published 2021-11-25. Read more...

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