This study examined whether common reactions to AIDS are consistent wi
th operation of the ''magical law of contagion,'' a traditional belief
that describes the transfer of properties, whether moral or physical,
harmful or beneficial, through contact. Three features of magical con
tagion, explored in previous work, were re-examined. These features so
metimes contrast with microbial contamination as described by modern g
erm theory. They are: permanence of effects; dose-insensitivity; and p
otential for effects to act backwards (i.e., from recipient back onto
source). A fourth characteristic, previously unaddressed, was also exp
lored: ''moral-germ conflation,'' i.e., the tendency to incompletely d
istinguish illness from evil. Three hundred and ninety-nine college st
udents completed a survey assessing each feature with regard to AIDS-r
elated scenarios. Also assessed was general AIDS knowledge. Subjects w
ere very well-informed about AIDS, yet a significant subset showed ''m
agical'' features of thinking. Consistent with moral-germ conflation,
degree of worry about getting AIDS was better predicted by guilt than
by risk behaviors and knowledge that they are risky. Implications are
discussed.