This study concerns hepatitis B antigen and antibody, (HBAg and HBAb) auto-antibodies and liver disease in a renal haemodialysis and transplantation unit between February, 1970 and December, 1972. Fourteen per cent of patients on maintenance haemodialysis, 25% of renal transplant recipients, and 5% of the staff were HBAg positive during this period. Three family members of antigen positive patients developed hepatitis; all were either antigen or antibody positive. Both immuno-electro-osmo-phoresis and radio-immuno-assay were used to detect HBAg. No additional carriers were identified among the dialysis or transplant patients by applying the more sensitive technique, although two persons with hepatitis were positive only by RIA. None of the staff members who developed antigen positive hepatitis died, and no one became a carrier. Dialysis patients who had icteric hepatis also cleared the antigen from the serum. Clinical hepatitis did not occur in immunosuppressed graft recipients who were carriers of the ay subtype of the antigen, nor was there histological evidence of liver disease in 18 of 19 of such carriers studied. Moreover, there was no association between long term carriage of the antigen and the presence of the auto-antibodies characteristic of chronic active hepatitis. Rapid reduction of immunosuppression was followed by acute hepatitis in one carrier, while another, whose antigen was of the ad subtype, developed micro-nodular cirrhosis.
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