YersiniaYersinia enterocoliticaYersinia InfectionsYersinia pseudotuberculosisYersinia pestisBacterial Outer Membrane ProteinsYersinia pseudotuberculosis InfectionsPlagueBacterial ProteinsVirulenceBodily SecretionsGenes, BacterialMolecular Sequence DataDNA, BacterialPlasmidsPore Forming Cytotoxic ProteinsVirulence FactorsBase SequenceGene Expression Regulation, BacterialSpecies SpecificityPolymerase Chain ReactionBacterial Typing TechniquesYersinia ruckeriPlague VaccineSiphonaptera