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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology

Species/Subspecies: Salmonella spp.
Category: Motile
Etymology: Genus name: named after the American bacteriologist D. E. Salmon.
Species epithet: spp. (species in pl.) is used to designate many different species (within the genus Salmonella in this case).
Significance:  [Very important]   
Type Strain: See individual subspecies.
Macromorphology (smell): Medium sized colonies (2-4 mm in diameter).
Micromorphology: Straight rods (0.7-1.5 x 2.0-5.0 µm). Most strains är motile with peritrochous flagella.
Gram +/Gram -:G-
Metabolism: Facultatively anaerobic
Other Enzymes: Hydrogen sulfide (H2S) +, ornithine decarboxylase +, tryptophanase (indole) -, urease -.
Biochemical Tests: Citrate +, methyl red +, Voges-Proskauer -.
Spec. Char.: See individual subspecies.
Disease:See individual subspecies.
Hosts: See individual subspecies.
Clinical Picture: See individual subspecies.
16S rRNA Seq.:  -
Taxonomy/phylogeny: There are two taxonomic systems for genus Salmonella. According to the old system, genus Salmonella was divided into seven species, but with modern taxonomic methods, it has been found that five of these should be combined into one species (Salmonella enterica) and according to the new system, genus Salmonella consists of the following three species: Salmonella bongori, Salmonella enterica and (Salmonella subterranea). The later is written within parentheses, because some researchers claim that Salmonella subterranea should not belong to genus Salmonella, but rather to genus Escherichia.

In the new system, the five "old species" have been transferred to different serovars and should be named e.g. Salmonella enterica subsp. enterica, serovar Enteritidis and so on. If you have used the correct nomenclature (as above) in a scientific text, it is sufficient to write Salmonella Enteritidis, the next time it appears. Observe that the serovar designations should always be written with capital first letter and should not be italicized.

Of the salmonella species, it is only Salmonella enterica that is included in VetBact and for further division into subspecies and serovars, see Salmonella enterica.

The old taxonomic system has mainly been abandoned and we strongly recommend the new system to be used.
Link: Salmonella nomenclature


New names of bacterial phyla

The taxonomic category phylum was previously not regulated by the International Code of Nomenclature of Prokaryotes (ICNP), but now this has changed and it was decided to revise the names of bacterial phyla. All phyla must be written in italics (which has been done on VetBact also before) and have the ending -ota.

Published 2023-03-01. Read more...
The taxonomy of chlamydias

Species within the family Chlamydiaceae were previously divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned to the genus Chlamydia and this change has now been incorporated in VetBact

Published 2023-03-15. Read more...

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