HB-antigen in serum and synovialis in acute hepatitis with and without polyarthritis

In 27 patients suffering from acute hepatitis serum and synovial-fluid were tested for HB-Ag. It was detected in the serum in 19 cases, in the synovial fluid in 2 cases, but never in both serum and synovial-fluid. HB-Ag was not found in 6 patients. Polyarthritis was seen in 10 cases; 5 of them carried HB-Ag in the serum, 2 in the synovial-fluid. A hepatitis B however, was also suspected in the 3 cases with polyarthritis lacking HB-Ag. The results suggest that virus B may persist in joints too and that polyarthritis associated with acute hepatitis is coupled to an infection with virus B.