On a broader level, the ethical issue is raised as to the extent to which biological knowledge about individuals should impinge on daily lives. Is it appropriate to regulate the risks inherent in people living together and interacting with each other? An issue has been raised with respect to hepatitis because the test can be easily done and because millions of people are tested as part of blood donor programs. As a consequence of these tests, this particular group of carriers has been identified. There are carriers of other agents, some of them potentially more hazardous (i.e. staphylococcus, typhoid) who are not routinely tested and therefore not placed at a disadvantage.