Prevalence of hepatitis B markers in psychiatric in-patients in Singapore: a pilot study.

The prevalence of hepatitis B infection among 71 patients in an adult psychiatric hospital was determined by testing for hepatitis B surface antigen (HBsAg), its antibody (anti-HBs) and antibody against hepatitis B core antigen (anti-HBc). The results showed 12.7 per cent positive for HBsAg, 63.4 per cent positive for anti-HBs and 69 per cent positive for anti-HBc. This assessment of the prevalence of hepatitis B in a group of adult long-term institutional patients may be used as a guide when hepatitis B vaccination is being considered for use in a psychiatric hospital. The need for a similar study on health care personnel working in the same institution is emphasized.