The Tuskegee Syphilis Study is often cited as a major reason for low research participation rates among racial/ethnic minorities. We use data from a random-digit-dial telephone survey of 510 African Americans and 253 Latinos drawn from low income Los Angeles neighborhoods to investigate associations between knowledge of the study and endorsement of HIV/aids conspiracy theories. Results indicate African Americans were significantly more likely than Latinos to endorse HIV/aids conspiracy theories and were more aware of the study. Nevertheless, few Americans and (...) Latinos had ever heard of Syphilis Study suggesting that awareness is not a major factor in low participation rates. (shrink)