the authors have studied the incidence of hepatitis associated antigen ( haa ) and the homologous antibody in sera of patients with rheumatoid arthritis on the basis of ( 1 ) arthritis sometimes associated with viral hepatitis , ( 2 ) the possible infectious etiology of rheumatoid arthritis , and ( 3 ) observation on the possible pathogenetic role of haa in some cases of polyarteritis nodosa .
C0003873
rheumatoid arthritis
C0003864
arthritis