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Species/Subspecies: Mannheimia varigena
Category: Causes hemolysis
Etymology: Genus name: named after the German microbiologist Walter Mannheim.
Species epithet: of different origin (refers to the fact that this species has been isolated from pigs and ruminants).
Significance:  [Of minor importance]   
Taxonomy:
Phylum
Proteobacteria
Class
Gammaproteobacteria
Order
Pasteurellales
Family
Pasteurellaceae 
Genus
Mannheimia
Type Strain: 177 = CCUG 38462
Macromorphology (smell): Small, regular and greyish colonies (1-2 mm in diameter). Most strains give hemolysis on bovine blood agar.
Micromorphology: Non-motile rods or coccoid rods (0.5 x 1.2 µm).
Gram +/Gram -:G-
Catalase/Oxidase:+/+
Other Enzymes: Ornithine decarboxylase (+), tryptophanase -, urease -.
Biochemical Tests: Citrate -, methyl red -, hydrogen sulphide (H2S) -.
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
+vv++
L-arabinosecellobioseD-mannitolsalicintrehalose
v?+?-
glycerolinulinraffinoseD-sorbitolstarch
(+)-v-?
Other carbohydrates: Adonitol -, dextrin (V), D-fructose +, D-fucose -, D-galactose +, D-glycogen -, mannose -, D-melezitose -, D-melibiose -, D-ribose +, L-sorbose -, xylitol -, D-xylose +.
Spec. Char.:
Disease:Pigs: septicemia, enteritis, pneumonia.
Cattle: septicemia, pneumonia, mastitis.
Hosts: Pigs, cattle
Clinical Picture:
Genome Sequence:
Acc-noStrainSize (bp)Genome
CP006953.1 177T 2 228 291 1l + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF053893 CCUG 38462T 1 504 

Taxonomy/phylogeny:
 
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.
Reference(s): No. 108
Updated:2018-12-06

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The revised taxonomy of mollicutes (mycoplasmas) has now been introduced on VetBact, which means that many of the species have been given new genus names or moved to another higher taxon. 

Published 2021-11-25. Read more...

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