Letter from I S Macdonald Scottish Home and Health Department to Mr T R M Simon Department of Health and Social Security providing feedback on the Report of the Advisory Committee on Testing for the Presence of Australia Antigen and its Antibody. Issues outlined include 1) There may not be sufficient evidence or supply of plasma to recommend the use of immunoglobulin to treat Hepatitis 2) the report was unclear on whether heat-treatment was or was not effective in rendering plasma non-icterogenic and HBsAg negative.