title: Folie à Deux and its interaction with early life stress: a case report.
abstract: BACKGROUND
  Folie à deux is a very rare psychiatric syndrome in which a psychotic symptom is transmitted from one individual to another. We present a case of folie à deux occurring during childhood, which is not an usual presentation of this syndrome. In this case, the disorder is correlated with child abuse and neglect, which possibly had a role in the development of the symptoms in our case.
  
  
  METHODS
  We present a case of folie à deux between an "induced" 9-year-old black Brazilian boy and the "inducer", his grandmother. They were found to be sharing similar auditory and visual hallucinations and delusional beliefs. The boy was neglected by his parents and was being cared for by his grandmother, who had a history of mental disorder.
  
  
  CONCLUSIONS
  The close relationship between the boy and his grandmother, the family history of first-degree psychosis, and the child abuse and neglect suffered by the boy may have altered his vulnerability to early-onset psychosis and, in this case, folie à deux.
authors.affiliation: Pediatrics Department, Hospital Universitário Evangélico de Curitiba, 2885 Padre Agostinho, apto 1304 torre barigui, ZIP 80710-000, Curitiba, Paraná, Brazil. dodonunes@hotmail.com.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Vargas Alves Nunes
authors.affiliation: Department of Health Science, Universidade Estadual de Londrina, Londrina, PR, Brazil.
authors.forename: Sandra
authors.initials: S
authors.lastname: Odebrecht Vargas Nunes
authors.affiliation: Pediatrics Department, Hospital Universitário Evangélico de Curitiba, 2885 Padre Agostinho, apto 1304 torre barigui, ZIP 80710-000, Curitiba, Paraná, Brazil.
authors.forename: Talita
authors.initials: T
authors.lastname: Strano
authors.affiliation: Pediatrics Department, Hospital Universitário Evangélico de Curitiba, 2885 Padre Agostinho, apto 1304 torre barigui, ZIP 80710-000, Curitiba, Paraná, Brazil.
authors.forename: Gilberto
authors.initials: G
authors.lastname: Pascolat
authors.affiliation: Psychiatry Department, Universidade Federal do Paraná, Curitiba, PR, Brazil.
authors.forename: Gustavo Manoel
authors.initials: GM
authors.lastname: Schier Doria
authors.affiliation: Psychiatry Department, Universidade Federal do Paraná, Curitiba, PR, Brazil.
authors.forename: Mauricio
authors.initials: M
authors.lastname: Nasser Ehlke
mesh_terms: D017668:Age of Onset; D000927:Anticonvulsants / Q000627:therapeutic use; D002220:Carbamazepine / Q000627:therapeutic use; D002648:Child; D002649:Child Abuse / Q000523:psychology*; D003702:Delusions / Q000150:complications; D000066502:Grandparents / Q000523:psychology*; D006212:Hallucinations / Q000150:complications; D006801:Humans; D008297:Male; D012753:Shared Paranoid Disorder / Q000150:complications* / Q000175:diagnosis* / Q000188:drug therapy / Q000523:psychology; D012931:Social Environment; D013315:Stress, Psychological / Q000150:complications* / Q000175:diagnosis* / Q000188:drug therapy / Q000523:psychology
chemical_list: D000927:Anticonvulsants; D002220:Carbamazepine
keywords: Case report; Child abuse; Child development; Early psychosis; Folie à deux; Induced delusional disorder; Shared paranoid disorder