Veterinary bacteriology: information about important bacteria
|Categories:||Causes hemolysis; primarily of interest in human medicin|
|Etymology:||Genus name: named after the Belgian microbiologist Jules Bordet (1870-1961), who first isolated B. pertussis.|
Species epithet: severe cough (whooping cough).
|Type Strain:||18-232 = ATCC 9797 = CCUG 30873 = NCTC 10739|
||Form small pinpoint white shiny colonies (appr. diameter 1 mm), which give hemolysis on blood agar.|
|Micromorphology:||Small non motile coccoid rods (0.2-0.5 x 0.5-1 µm), which appear singly, in pair or more rarely in chains.|
|Gram +/Gram -:||G-|
|Other Enzymes:||Urease -|
|Biochemical Tests:||Citrate +|
|Fermentation of carbohydrates:||Bordetella spp. does not ferment carbohydrates.|
|Spec. Char.:||Optimal growth temperature: 35-37°C.|
|Virulence Factors:||Filamentous hamagglutinin which anchors the bacteria to cilia. A tracheal cytotoxin, which inhibits the movement of the cilia, is then produced. Lipopolysaccharide (LPS), which is an endotoxin. Pertussis toxin (PT) which is an AB5-type exotoxin, helps the bacteria to colonize the respiratory tract. PT is secreted by a type IV secretion system.|
|16S rRNA Seq.:|
||Eight species have been described within genus Bordetella. The four species, which are described in VetBact, are very closely related.|
|Comment:||B. pertussis is easily spread by coughing and the incubations period is 1-2 weeks.|
|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...