Veterinary bacteriology: information about important bacteria
|Categories:||Motile; in the normal flora|
|Etymology:||Genus name: citrate-utilizing rod (bacterium).|
Species epithet: named after the bacteriologist A. Freund, who first observed that trimethylene glycol was a product of fermentation.
|Significance:||[Of minor importance]|
|Type Strain:||ATCC 8090 = CCUG 418 = NCTC 9750.|
||Medium-sized translucent to opaque colonies (2-4 mm in diameter) with glossy surface.|
|Micromorphology:||Straight rods (1.0 x 2.0-6.0 µm), which usually are motile by means of peritrichous flagella.|
|Gram +/Gram -:||G-|
|Metabolism:||Facultatively anaerobic. Can utilize citrate as the sole carbon source.|
|Other Enzymes:||DNase -, esculinase -, ornithine decarboxylase -, tryptophanase v, urease v.|
|Biochemical Tests:||Citrate (+), methyl red +, Voges-Proskauer -.|
|Fermentation of carbohydrates:||
All strains ferment glucose under acid production and about 90% of them also under gas production. Sorbose phosphate +.
|Disease:||Is an opportunistic or secondary pathogen, which may cause wound infections. In humans, C. freundii in rare cases, cause food poisoning.
|Hosts:||Is an environmental bacterium, which also can be isolated from many different species.|
|16S rRNA Seq.:|
||Thirteen species have been described within genus Citrobacter. Citrobacter freundii belongs to the family Enterobacteriaceae and is closely related to members of the genus Klebsiella. In fact, Citrobacter freundii and members of the genus Klebsiella form a monophyletic cluster (see Fig. 142:4 to the left).|
|Comment:||Some strains can easily be confused with Salmonella spp. in routine diagnostics. Grows in the same way on BG XLD and purple agar.|
|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 VetBactPublished 2023-03-15. Read more...