Veterinary bacteriology: information about important bacteria
|Species/Subspecies:||Mycobacterium avium subsp. paratuberculosis|
|Category:||Notifiable diseases and bacteria|
|Etymology:||Genus name: small fungus-like rod.|
Species epithet: of birds.
Subspecies epithet: tuberculosis like.
|Significance:||Paratuberculosis is globally prevalant and is common in many countries in Europe. Sweden has been free from the disease during many years, but outbreaks have occured at a few occasions during the 21 century in connection with imports of cattle.
|Type Strain:||ATCC 19698.|
||Small (0.1-2 mm in diameter), raised, white or pale yellow colonies.|
||Acid-alcohol-fast rods (0.5 x 1.5 µm), which are non-motile.|
|Gram +/Gram -:||G+ (but difficult to gram stain)|
|Spec. Char.:||Generation time in vitro: 1,5-4 days. M. avium subsp. paratuberculosis is a slow grower (it takes more than 7 days to see colonies with the naked eye). For primary isolation, it may be necessary to incubate the culture tube for 3-4 months.|
|Disease:||Johne's disease or paratuberculosis.
|Hosts:||Ruminants (most common: cattle, goats and sheep).|
|Clinical Picture:||Weight loss, reduced milk production, diarrhea and eventually death.|
|16S rRNA Seq.:|
||About 175 species have been described within genus Mycobacterium and this genus is closely related to Rhodococcus, Nocardia and Corynebacterium. M. avium subsp. paratuberculosis subsp. avium is, as the name implies, very closely related to M. avium.|
|Legislation:||Paratuberculosis is in Sweden a notifiable disease and it is compulsary to report it to the Swedish Board of Agriculture. The disease is regulated by the law of epzooties.|
|Comment:||Mycobactin, which is a so-called siderophore (iron binding ligand with high affinity), is required as an additive in the medium for growth mediet. M. avium subsp. paratuberculosis grows extremely slow.|
|Reference(s):||No. 12, 37, 38|
|Links:||Epiwebb - om epizootisjukdomar [in Swedish], Johne's Information Center|
|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...