Bartonella henselaeBartonella InfectionsBacteremiaCat-Scratch DiseaseImmunocompetenceBartonellaCat DiseasesCatsPeliosis HepatisRickettsieaeImmunocompromised HostAnti-Bacterial AgentsGram-Negative Bacterial InfectionsRickettsiaceaeSepsisStaphylococcal InfectionsSiphonapteraBloodDNA, BacterialAntibodies, BacterialPolymerase Chain ReactionGram-Positive Bacterial InfectionsEndocarditis, BacterialActinomycetales InfectionsRNA, Ribosomal, 16SCtenocephalides