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  • Title: Possession of identical nonconjugative plasmids by different isolates of Pasteurella multocida does not imply clonality.
    Author: Ikeda JS, Hirsh DC.
    Journal: Vet Microbiol; 1990 Mar; 22(1):79-87. PubMed ID: 2186566.
    Abstract:
    Experiments were performed to test the hypothesis that possession of the same nonconjugative R plasmid by different isolates of Pasteurella multocida implied that they were of the same clone. Seven isolates of P. multocida were studied, two possessed an identical nonconjugative R plasmid (pVM109), four possessed another (pVM110), and one isolate possessed a nonconjugative R plasmid related to pVM110. Phenotypic and genotypic characteristics of the isolates were determined and compared. Isolates possessing the same nonconjugative R plasmid were shown to be different, and isolates possessing a different nonconjugative R plasmid were shown to be the same. We conclude that possession of an identical nonconjugative R plasmid by two isolates of P. multocida does not imply clonality.
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