Mannheimia ruminalis

Mannheimia ruminalis
Scientific classification
Domain: Bacteria
Kingdom: Pseudomonadati
Phylum: Pseudomonadota
Class: Gammaproteobacteria
Order: Pasteurellales
Family: Pasteurellaceae
Genus: Mannheimia
Species:
M. ruminalis
Binomial name
Mannheimia ruminalis
Angen et al. 1999

Mannheimia ruminalis is a species of Gram-negative, facultatively anaerobic bacteria belonging to the family Pasteurellaceae. It was first described by Angen et al. in 1999 following a taxonomic revision of the former Pasteurella haemolytica complex based on DNA–DNA hybridization and 16S rRNA gene sequencing.[1]

Characteristics

M. ruminalis is a rod-shaped coccobacillus, nonmotile, and typically exhibits β-haemolysis on blood agar. It is oxidase-positive and catalase-positive, and can ferment several carbohydrates. The species is commonly found in the oral cavity and rumen of healthy ruminants, particularly sheep and cattle.

Ecology and Occurrence

M. ruminalis has been isolated from the rumen and upper respiratory tract of healthy animals, as well as from mastitic milk and inflamed tissue in sheep. Although part of the normal microbiota, it has been identified in association with certain disease states, including mastitis in sheep and occasionally in respiratory infections. However, it is not considered a primary pathogen and its role in disease is often opportunistic or secondary to other infections.[2]

Taxonomy

M. ruminalis is one of several species classified within the genus Mannheimia, which was proposed during the reclassification of the Pasteurella haemolytica complex. Other closely related species include:

References

  1. ^ Angen, O.; Mutters, R.; Caugant, D. A.; Olsen, J. E.; Bisgaard, M. (1999). "Taxonomic relationships of the [Pasteurella] haemolytica complex as evaluated by DNA-DNA hybridizations and 16S rRNA sequencing with proposal of Mannheimia haemolytica gen. nov., comb, nov., Mannheimia granulomatis comb. nov., Mannheimia glucosida sp. nov., Mannheimia ruminalis sp. nov. and Mannheimia varigena sp. nov". International Journal of Systematic Bacteriology. 49 (1): 67–86. doi:10.1099/00207713-49-1-67. ISSN 0020-7713. PMID 10028248.
  2. ^ Poulsen, Louise L.; Reinert, Turið M.; Sand, Rikke L.; Bisgaard, Magne; Christensen, Henrik; Olsen, John E.; Stuen, Snorre; Bojesen, Anders M. (2006). "Occurrence of haemolytic Mannheimia spp. in apparently healthy sheep in Norway". Acta Veterinaria Scandinavica. 48 (1): 19. doi:10.1186/1751-0147-48-19. ISSN 1751-0147. PMC 1949873. PMID 17076903.

Further reading

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