A survey was made of 710 American Indians of Oregon, Washington, and Idaho to assess the population's knowledge, attitudes, and behaviors in respect to acquired immunodeficiency syndrome (AIDS), to estimate the population's risk, and to plan strategies to reduce it. In contrast to 3 percent of the general population, this study found 10.6 percent of male and 6.4 percent of female Pacific Northwestern American Indians in groups considered at high risk for AIDS.