Educational interventions in general hospitals focused on preventing psychiatric misdiagnosis should target in-hospital services where patients tend to be older.

No abstract

RESUMO -Quadros de transtorno psiquiátrico induzido (folie à deux) são raros. Porém, sua prevalência pode ser de 5-25% nos casos de delírio de infestação parasitária. Relatamos o caso de uma paciente de 62 anos de idade com sintomas psicóticos que, há cerca de 15 anos, está vivendo com sua irmã mais nova. Como a paciente não estava mais apresentando sintomas, sua irmã decidiu não administrar-lhe mais antipsicótico. A paciente voltou a apresentar quadro psicótico marcado por delírio de infestação parasitária, acompanhado por alucinações visuais. Sua irmã, que não tinha história de qualquer transtorno psiquiátrico prévio, passou a acreditar que realmente a paciente estava infestada e que ela mesma fora contaminada. Esse relato de caso objetiva discutir a associação existente entre folie à deux e delírio de infestação parasitária. ABSTRACT -Shared psychiatric disorder (folie à deux) is a rare condition. But its prevalence can be 5-25% in patients with delusional parasitic infestation. We report the a case of a 62 years-old female with psychotic symptoms. For 15 years, she has lived with her younger sister. Since the patient was well-controled, her sister interrupted her antipsychotic drug administration. So, the patient initiated delusional parasitic infestation accompanied by visual hallucinations. Her sister, who did not have psychiatric history, initiated to believe that the patient was really infested. Moreover, she started to believe that was infested by the patient. This case report aims to discuss the relation between folie à deux and delusional parasitic infestation. PALAVRAS-CHAVEKEY WORDS: delusional parasitic infestation, Ekbom's syndrome, folie à deux, induced psychotic disorder, risk factors.

A family with seven members is described, in which three members present Darier's disease and depression. This apparent cosegregation, if true, would support the hypothesis that in some pedigrees, a gene for mood disorder may be located on chromosome 12.