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One of the most disheartening trends in public health in the last 20 years has been the rise of the antivaccination movement linked to false perceptions of an association between routine childhood vaccinations and autism. Despite major efforts to counter this concern, vaccination rates continue to be suboptimal. However, parents' decisions about whether to have their children immunized are based not only on their worry about safety, but also on their perception of benefit. In a trial involving 315 participants (mean age, 35; 51% women), researchers used pre- and posteducation surveys to determine whether information emphasizing the dangers of measles and mumps might be more effective in improving people's perceptions of immunization than ma…