|Etymology:||Genus name: named after the German microbiologist Walter Mannheim.|
Species epithet: hemolysing.
|Old 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 weak 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:||
|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.|
|"Dear child has many names" (call it what you will...)|
For a long time, Rhodococcus hoagii was referred to Rhodococcus equi on VetBact, because we experienced some resistance to the name that is now considered to be the correct one, i.e. Rhodococcus hoagii. Now you can find the bacterium in question under the correct name in VetBact, but you can also find the bacterium when searching for the old name.Published 2021-10-10. Read more...