In October 1987, the Centers for Disease Control mounted a massive public information campaign to alert the US public to the dangers of acquired immune deficiency syndrome (AIDS) and to provide information about its transmission and prevention. Data from 2 Gallup surveys – one just before the campaign began and the other several months after its conclusion – are used to examine changes in public information and misinformation about transmission. It is concluded that, although some changes in knowledge did take place, these were essentially a continuation of trends beginning before the public information campaign and continuing well after its conclusion. For these and other reasons, it is argued that the effects of the campaign on public information were minimal.