AIDS primarily affects specific 'risk groups.' Mainstream heterosexual teenagers are not at significant risk.

In the winter of 1993, the film Philadelphia opened in theaters across the United States. Tom Hanks played Andrew Beckett, a Philadelphia lawyer fired after his firm discovered he had AIDS. The film earned Hanks an Academy Award and brought an audience of millions to a story that had, for most of the preceding decade, been treated by mainstream American culture as someone else's tragedy. Teachers across the country showed it in health and social studies classes. What is striking, in retrospect, is what students were likely learning in the same schools before and after the screening ended: that AIDS was a disease of specific risk groups to which most of them did not belong.

By 1993, the science was not ambiguous. HIV had been identified as the causative agent in 1984. Heterosexual transmission had been formally documented by the CDC by 1985. The World Health Organization had been reporting since the late 1980s that in sub-Saharan Africa, AIDS was spreading primarily through heterosexual intercourse, with women increasingly constituting the majority of cases. In the United States, more than 190,000 people had died by 1993, and a growing fraction, over 10 percent by that point, and climbing, had been infected through heterosexual contact with no IV drug use history.

Yet the risk-groups framework that had shaped the earliest epidemiological reporting persisted in school health curricula long after it had been revised in public health practice. The framework had bureaucratic momentum. Curricula written in 1985 and 1986, when CDC case reports still showed the epidemic concentrated in gay men and intravenous drug users, remained in active use across the country. Health teachers, many of whom had received no specialized training in HIV prevention, relayed a simplified transmission picture that mapped poorly onto the epidemic as it actually existed by the early 1990s. The implicit message, reinforced in countless classroom discussions, was that a heterosexual, non-drug-using student was functionally not at risk.

The consequences of that message were visible in surveys conducted throughout the early 1990s. Studies published in journals of adolescent health found that teenagers consistently underestimated personal HIV risk while accurately citing abstract statistics about transmission routes. The gap between knowing that HIV could be transmitted heterosexually and believing that it posed a personal risk was wide, and health educators trained on the risk-group model were, in effect, teaching the epidemiology of a decade earlier.

The Philadelphia film, which director Jonathan Demme had made partly because the mainstream media had treated AIDS as marginal, became an awkward artifact in this context: a Hollywood production more willing to engage the epidemic directly than most school health curricula. What a film could not do was replace the missing clinical instruction. Students who watched Andrew Beckett die of AIDS in health class were absorbing a message about stigma and dignity. They were not being taught about transmission routes, condom use, or their own risk level.

The systematic lag between scientific understanding and classroom instruction was not unique to HIV. But in the context of an epidemic whose growth in the United States could be measured in deaths per day, the gap between what public health professionals knew and what students were being taught had consequences that were not theoretical. By the time comprehensive HIV prevention education reached most American schools in the mid-to-late 1990s, the epidemic had been spreading among heterosexual adolescents and young adults for nearly a decade. The risk-group framework had not protected them. It had, by suggesting the epidemic was not their concern, left them less prepared than they might otherwise have been.