The etiology of rheumatoid arthritis.
D001170:Arthritis, Infectious / Q000382:microbiology; D001172:Arthritis, Rheumatoid / Q000209:etiology* / Q000276:immunology / Q000382:microbiology; D001419:Bacteria / Q000302:isolation & purification; D006801:Humans; D009174:Mycoplasma / Q000302:isolation & purification; D014780:Viruses / Q000302:isolation & purification