Veterinary bacteriology: information about important bacteria
|Categories:||Motile; notifiable diseases and bacteria|
|Etymology:||Genus name: similar to mycoplasma (fungus shaped).|
Species epithet: chicken poisoning (infecting).
|Alternative Species Name(s):||Mycoplasma gallisepticum|
|Type Strain:||PG31 = ATCC 19610 = NCTC 10115.|
||Forms small very typical umbonated colonies ("fried egg appearance"). The macro morphology can be observed in a microscope.|
|Micromorphology:||Very small and flask-shaped. M. gallisepticum has gliding motility on surfaces.|
|Gram +/Gram -:||G-, but is normally not gram stained because the cells will then be fragmented.|
|Metabolism:||Facultatively anaerobic. Glucose fermenter.|
|Fermentation of carbohydrates:||Glucose +|
|Spec. Char.:||Lacks a cell wall.|
|Disease:||Avian mycoplasmosis (Chronic respiratory disease in chickens and infectious sinusitis in turkey).
|Diagnostics:||Cultivation and immunofluorescens, PCR.|
|16S rRNA Seq.:|
||About 10 species have been described within the genus Mycoplasmoides. M. gallisepticum is rather closely related to M. pneumoniae. See the phylogenetic tree (Fig. 36:2) where M can mean Mycoplasma, Mesomycoplasma, Metamycoplasma, Mycoplasmoides or Mycoplasmopsis.|
|Legislation:||Avian mycoplasmosis caused by M. gallisepticum is included in OIE's B-list of major animal diseases. The disease is notifyable in Sweden|
|Comment:||Based on whole genome sequencing, the taxonomy of mycoplasmas has recently undergone a comprehensive revision. The new taxonomy has now been introduced in VetBact, but it will still be possible to search for the alternative species names. Read more about the revised taxonomy of the mollicutes under the Term list of VetBact and see also reference 164 below.|
|Reference(s):||No. 29, 164|
|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...
|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...