“…Outbreaks in schools may have been reported more frequently than those that occur elsewhere because of the importance attached to investigating outbreaks involving children. In addition, the existence of operational definitions (1,14,19,26,55,56,58,60,62,64,67,68,94,101,102) and lists of positive features suggesting epidemic hysteria (1, 18-20, 87, 96, 103) developed over recent years also may increase the likelihood that an outbreak is identified as epidemic hysteria. At the same time, these identifications of characteristics may lead researchers away from considering epidemic hysteria as the cause of an outbreak.…”