• J L Tizón, H Pañella, and R Maldonado.
• Unidad de Salud Mental de Sant Martí, Instituto Municipal de Salud Pública, Barcelona.
• Aten Primaria. 2000 Apr 30; 25 (7): 479488479-88.

ObjectivesTo describe a new outbreak of "mass hysteria" or "epidemic conversion disorder" occurring in Barcelona in 1997. Based on this outbreak's features differentiating it from other similar outbreaks described in the literature or treated by the same team, to propose a change in the theoretical framework for these group somatomorphic phenomena.DesignA study describing clinical epidemiological research and the interventions performed.SettingUrban health centre. Epidemiological research and data analysis performed by the Municipal Health Institute (MHI) of Barcelona.Interventions And MeasurementsThe following were performed: a) Diagnostic screening of population. b) The usual epidemiological surveys of the MHI. c) Semi-structured interviews with the quarter's care professionals. d) Two group sessions with the quarter's health professionals. MHI experts analysed statistically the data provided by measurements b) and c).Results276 people (42% of the population of the quarter) were studied. The attack rate was 10%. Data analysis noted that communication of the fantasy of the outbreak of scabies facilitated self-diagnosis and even diagnosis by health professionals.ConclusionsGiven the frequency and the social and health implications of this kind of somatomorphic disorder, both in the developed countries and those "on the road to development", clinical researchers and epidemiologists should not wait to pose the possibility of hysteria until after the "organic" aetiology of an epidemic outbreak has been completely discounted. The second series of conclusions points towards the incorrectness of defining all these outbreaks as mass hysterical disorders. In reality, we should be thinking, more openly and in a more scientifically modern way, of epidemic somatomorphic disorders of various kinds. The outbreak described in the current study could be referred to as the hypochondriform variety of outbreak, whereas those described elsewhere by the same team could be understood as the conversion variety.

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