Bathing BeachesRisk AssessmentSensitivity and SpecificityPolymerase Chain ReactionMolecular Diagnostic TechniquesReproducibility of ResultsSequence Analysis, DNADNA, BacterialVirologyNucleic Acid Amplification TechniquesRickettsia felisDNA PrimersSiphonapteraReverse Transcriptase Polymerase Chain ReactionLaboratory Proficiency TestingMolecular Sequence DataParasitologyBacteriological TechniquesBartonellaLimit of DetectionNeoplastic Cells, CirculatingPhylogenyFecesBase SequenceKobuvirusPathology, MolecularReagent Kits, DiagnosticDNA Probes