AIDS is a special infectious disease which mankind had never anticipated. Though much interest in and concern over it were shown temporarily by reason of peculiar disclosures made about homosexuals, attention to the facts and menace of AIDS seems to be lessening gradually in Japan. Mankind have many infectious diseases, i.e. B-type hepatitis, AIDS etc.…, and a new one may appear in the future. The medical staff must keep this in mind and be prepared to prevent infection from all patients and all medical work in daily clinical work.