AIDS is truly an international phenomenon, with cases now reported on every continent. To combat the AIDS epidemic, the nations of the world may be reverting to a pattern of quarantine and restrictions on international travel. For example, on April 23, 1986, the Federal Register gave notice of a rule proposed by the Centers for Disease Control of the United States Public Health Service that, if enacted, will add AIDS to the list of seven diseases that provide grounds for exclusion of aliens. This action would allow the U.S. Department of State to deny visas and the Immigration and Naturalization Service to deny admission to aliens subject to medical examination (generally immigrants and refugees) who are found to have AIDS. Although seemingly innocuous, the proposed regulation was initially seen by gay rights groups as an instrument that could potentially be used to harass homosexuals and other high-risk groups seeking entry to the United States. The proposed regulation also contrasts with the U.S. Public Health Service’s domestic strategy for coping with AIDS, which emphasizes education rather than quarantine as the principal means of controlling the disease.