Veterinary bacteriology: information about important bacteria
|Etymology:||Genus name: named after the German microbiologist Walter Mannheim.|
Species epithet: hemolysing.
|Alternative Species Name(s):||Pasteurella haemolytica, biotype A|
|Type Strain:||J.A. Watt 1266A&B = ATCC 33396 = CCUG 408 and 12392 = NCTC 9380.|
||Medium sized greyish colonies (2-3 mm in diameter). Give a complete hemolysis on horse blood agar, which is easier to observe if the colonies are removed. The hemolysis is easier to observe on bovine blood agar.|
|Micromorphology:||Nonmotile small rod|
|Gram +/Gram -:||G-|
|Other Enzymes:||Tryptophanase -, ornithine decarboxylase -, urease -.|
|Biochemical Tests:||Citrate -, hydrogen sulphide (H2S) -, methyl red -, Voges-Proskauer -.|
|Fermentation of carbohydrates:||
Other carbohydrates: Adonitol -, dextrin +, D-fructose +, D-fucose -, D-galactose +, D-glycogen -, mannose -, D-melezitose -, D-melibiose -, D-ribose +, L-sorbose -, xylitol -, D-xylose +.
|Virulence Factors:||Adhesines (two membrane proteins OmpA and Lpp1), capsule, endotoxin (toxic for bovine endothelial cells) and leukotoxin (pore-forming cytolysin), which has a potent effect on neutrophiles of ruminants that results in cell death.|
|16S rRNA Seq.:|
||Six 17 have been described within genus Mannheimia. The relationship between members within the closely related genera Actinobacillus, Haemophilus and Pasteurella is very uncertain since none of these genera forms monophyletic clusters.|
|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...