Letter from Dr E. D. Achesone and A. A. B Poole, Department of Health and Social Security to Regional Medical Officers, Regional Nursing Officers, District Medical Officers, and District Nursing Officers re Guidance for Health Care Personnel Dealing with Patients Infected with Hepatitis B Virus. Letter informs that the Advisory Group on Hepatitis has considered question of advice to health care personnel who are treating patients who are hepatitis B surface antigen positive.