Arthritis, ReactiveArthritisArthritis, RheumatoidArthritis, InfectiousYersinia InfectionsHLA-B27 AntigenArthritis, ExperimentalSynovial FluidYersinia enterocoliticaArthritis, JuvenileArthritis, PsoriaticSynovial MembraneJointsChlamydia InfectionsSalmonella InfectionsSpondylitis, AnkylosingChlamydia trachomatisSpondylarthropathiesChlamydiaRheumatic DiseasesYersiniaOsteoarthritisCampylobacter InfectionsLymecyclineAntigens, BacterialArthritis, GoutySalmonella enteritidisHafniaRheumatoid FactorRats, Inbred LewImmunoglobulin GAntibodies, BacterialKnee JointMice, Inbred DBAImmunoglobulin AEnteritisSynovitisUrethritisYersinia pseudotuberculosis InfectionsImmunoglobulin MEnzyme-Linked Immunosorbent AssayTumor Necrosis Factor-alphaDysentery, BacillaryCollagen Type IISeverity of Illness IndexSalmonellaCampylobacter jejuniShigellaMethotrexate