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Swedish University of Agricultural Sciences

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:
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:2022-10-03

News

New names of taxa within the classification category phylum

During October 2021, an article was published by A. Oren och G.M. Garrity, in which new names are proposed for a number of taxa within the classification category phylum. This has resulted in many discussions in social media about whether it was really necessary to make these changes, which have created confusion among microbiologists and other professionals who come into contact with bacteriology.

Published 2022-09-28. Read more...

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