Problems posed by HIV/AIDS differ from those ofpast epidemics by virtue of unique propertiesof the causative agent, dramatic societalchanges of the late 20th century, and thetransition of medical practice from aprofessional ethic to a technology-dependentbusiness ethic. HIV/AIDS struck during thecoming-of-age of molecular biology and also ofbioethics, and the epidemic stimulated thegrowth of both disciplines. The number ofarticles published about AIDS and ethics (asidentified by a MEDLINE search) peaked in 1990,just before the peak incidence of AIDS in theUnited States. The character (...) of ethicaldialogue has now shifted from familiar moralquandaries such as civil liberty versus publicwelfare to concerns about vaccine trials andpublic policy toward the developing world.Physicians and other health care workers whowere involved from the onset endured somethingof an emotional roller coaster. Theircompassion-based work ethic was to a largeextent replaced by a competence-based workethic after the introduction in 1996 of highlyactive antiretroviral therapy. The abundantrecent literature on ``professionalism'' inmedicine makes scant mention of AIDS/HIV. Thedisruptive effect of AIDS/HIV on society wouldhave been substantially greater had relevanttechnology such as the ability to isolateretroviruses and potent therapy againsttuberculosis not been in place. This soberingconsideration, along with such recent events asthe use of bioterrorism against civilianpopulations, suggests new relevance forPotter's definition of ``bioethics'' as a scienceof survival in which the biology of ecosystemsmust be taken into account. (shrink)