Meeting agenda for the Advisory Group on Testing for the Presence of Hepatitis B Surface Antigen and its Antibody, fifth meeting, 17 September 1980. Discusses a progress report on the work of the MRC Group on non-A, non-B hepatitis, and the progression of the introduction of testing for the presence of HBsAg. The agenda encloses a note from Professor Zuckerman regarding the characterisation of non-A, non-B hepatitis antigens.