Investigations on the species specificity of Mannheimia (Pasteurella) haemolytica serotyping

Øystein Angen, Malcolm Quirie, Willie Donachie, Magne Bisgaard

    Research output: Contribution to journalJournal articleResearchpeer-review


    Eleven serotypes (1, 2, 5-9, 12-14 and 16) have been demonstrated within Mannheimia haemolytica. Subsequent serotyping of 166 Mannheimia haemolytica-like strains, genetically and phenotyphically distinct from Mannheimia haemolytica, and isolated from ruminants, pigs, hares and rabbits showed that 13.2% were typeable, 19 of which were serotype 11 representing strains now being classified as M. glucosida. In addition, three strains belonged to serotypes 6, 9 and 16, respectively. Additionally, the serotyping results of 98 (P.) haemolytica-like isolates from non-ruminant sources collected by the UK Veterinary Investigation Centres during the period 1982-1996 were investigated. None of these isolates have been kept, making further genetic characterization impossible. Among these isolates, 25.5% were typeable representing serotypes 1, 2, 3, 5, 6, 9, 10, 13 and 15. Substantial evidence has been reported indicating that M. haemolytica-like isolates from non-ruminant sources represent species different from M. haemolytica. The present investigation underlines that serotyping does not represent a reliable method for the identification of M. haemolytica or M. glucosida. These observations emphasize that extended phenotypic and genetic characterization is necessary for the proper identification of these organisms.
    Original languageEnglish
    JournalVeterinary Microbiology
    Issue number4
    Pages (from-to)283-290
    Publication statusPublished - 1999


    • Pasteurella haemolytica
    • serotyping
    • Mannheimia haemolytica


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