Veterinary bacteriology: information about important bacteria
|Categories:||Spore forming; motile|
|Etymology:||Genus name: a small spindle. |
Species epithet: hair-shaped (pilus means hair).
|Significance:||[Of minor importance]|
|Alternative Species Name(s):||Bacillus piliformis|
|Type Strain:||Has not been defined.|
|Macromorphology (smell):||Cannot be cultivated on artificial media.|
|Micromorphology:||Large spore forming and filamentous rod (0.5 x 8-10 µm).|
|Gram +/Gram -:||G- under aerobe conditions, but has actually a G+ cell wall.|
|Spec. Char.:||Obligate intracellular bacterium.|
|Hosts:||Primarely rodents, but has also been reported from foals, calf, dog and cat.|
|Clinical Picture:||Most infections are subclinical, but watery diarrhea with high mortality occurs.|
|Virulence Factors:||Virulence mechanisms are poorly understood, but C.piliforme seems to produce an exotoxin (cytotoxin).|
|16S rRNA Seq.:|
||About 175 different species have been described within the genus Clostridium. C. piliforme is like C. difficile and C. sordellii only distantly related to other clostridia as shown in the phylogenetic tree (see Fig. 28:1). However, the names have been changed for the two latter, which are now called Clostridioides difficile and Paeniclostridium sordellii, respectively. The reason why C. piliforme has not been renamed is probably that no type strain has been defined because the bacterium can not be grown.|
|Comment:||Cannot be cultivated on artificial media. The species name has not been approved because no type strain has been defined.|
|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...