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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Rickettsia helvetica
Category: Primarily of interest in human medicin
Etymology: Genus name: Named after Howard T. Ricketts, who showed which organism caused Rocky Mountain spotted fever, which resulted in his death
Species epithet:from Switzerland.
Significance:  [Of minor importance]   
Taxonomy:
Phylum
Proteobacteria
Class
Alphaproteobacteria
Order
Rickettsiales
Family
Rickettsiaceae 
Genus
Rickettsia
Type Strain: C3 = ATCC VR-1375
Macromorphology (smell): Cannot be cultivated on cell free substrates (for instance agar plates).
Micromorphology: Pleomorphic rods (0.3-0.5 x 0.8-2.0 µm).
Gram +/Gram -:
Catalase/Oxidase:
Spec. Char.:
Vector: Tick (Ixodes ricinus).
Disease:Tick borne rickettsiosis
Hosts: Humans
Clinical Picture:
Genome Sequence:
Acc-noStrainSize (bp)Genome
CM001467 C9P9 1 369 927 1c + 1c 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
CM001467 (region 522930-524428) C9P9 1499 

Taxonomy/phylogeny:
 
About 30 species have been described within the genus Ricketsia. This genus is relatively closely related to other genera within the orderRickettsialas (Anaplasma, Ehrlichia and Neorickettsia).
Comment:An evolutionary interesting bacterium, because its ancestors invaded cells and formed the mitochondria by endosymbiosis.
Updated:2020-11-05

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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