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The 16 somatic serotype type strains and 60 field isolates of Pasteurella multocida, representing various avian species and geographic regions in Hungary, were characterised by PCR-restriction fragment length polymorphism (PCR-RFLP) analysis of the ompH gene with DraI restriction endonuclease. The type strains yielded eight different (I-VIII) profiles. Strains whose PCR fragment was uncut by DraI (profile IV) could be differentiated with HindIII and PvuII restriction endonucleases. Five of the eight PCR-RFLP profiles (I, III, V, VI and VII) were detected among the field strains. Only a correlation of limited strength was found between the classical somatic serotypes and the PCR-RFLP profiles. However, the results confirmed that molecular methods could confidently distinguish serotype A:1 strains from the other serotypes. Moreover, the specific relationship between somatic serotypes and PCR-RFLP types among isolates from turkey raises the possibility of the existence of host-specific clones within the P. multocida population.

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, septica and gallicida ), five capsular types (A, B, D, E and F), 16 somatic serotypes (1–16) and 13 biovars (1–10 and 12–14) ( Harper et al., 2006 ). The age, host species, immunity status, husbandry methods or wildlife–livestock interface can influence

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