Mannheimia glucosida is a species of Gram-negative bacteria in the family Pasteurellaceae. It was first described in 1999 following a taxonomic revision of the Pasteurella haemolytica complex.[1]
The species name glucosida is derived from the Greek word glykys meaning "sweet" and the Latin suffix -ida, indicating a connection to glucosides. The name reflects the bacterium’s ability to ferment glucoside sugars.[2]
Morphology and physiology
M. glucosida is a non-motile, Gram-negative coccobacillus. It is facultatively anaerobic and forms small, grayish, smooth colonies on blood agar, often exhibiting β-hemolysis. The bacterium grows optimally at 37°C and can ferment glucose, lactose, maltose, and sucrose without gas production. It is oxidase-positive and catalase-positive.[3]
Isolation and habitat
The type strain was isolated from the lung of a sheep. Other strains have been recovered from the upper respiratory tracts of healthy ruminants, especially sheep and cattle, indicating a role as part of the commensal microbiota.[1]
Clinical significance
M. glucosida has been implicated in ovine mastitis. A 2010 study in southeastern Australia found it in 50% of clinical mastitis cases, while it was rarely found in healthy udder samples.[4]
Although primarily a veterinary organism, M. glucosida has also been isolated from a human bite wound, suggesting its potential as a zoonotic pathogen.[5]
Molecular identification
Molecular diagnostic methods such as PCR and 16S rRNA gene sequencing are used to identify M. glucosida. A 2015 study validated a multiplex PCR assay that differentiates among closely related Pasteurellaceae species, including M. glucosida, based on capsule loci and other genetic markers.[5]
References
1 2 3 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. PMID10028248.
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