title: Contact allergy to beryllium chloride: report of 12 cases.
abstract: BACKGROUND
  Isolated cases of allergic contact dermatitis, gingivitis and stomatitis caused by beryllium have been previously reported. We have been able to study a series of 12 patients with patch test reactions to beryllium chloride.
  
  
  OBJECTIVE
  The study was aimed at defining the clinical and patch testing characteristics in this group of patients, and determining whether some were delayed elicitation reactions or late reactions of active sensitizations by patch testing.
  
  
  METHODS
  We performed a 5-year retrospective study of patients tested with a metal series, and studied a subgroup who showed reactions to beryllium chloride.
  
  
  RESULTS
  A total of 1799 patients were patch tested, 62 of whom were also tested with a specific metal series; 12 of them reacted to beryllium chloride. Eight of the 12 patients showed reactions to other metals. Based on the time of positive reaction to beryllium chloride, three patterns emerged: (i) 3 patients showed positive reactions on D2-D4; (ii) 6 patients showed positive reactions between D7 and D10; and (iii) 3 patients showed positive reactions later than D10.
  
  
  CONCLUSIONS
  Contact allergy to beryllium chloride may not be as unusual as the literature suggests. In order to avoid undetected contact allergies, we recommend performing later readings, between D7 and D10, whenever patch testing is performed with beryllium chloride. Active sensitization may occur.
authors.affiliation: Dermatology Department, Hospital General Universitario de Alicante, Spain. fernandotoledoalberola@hotmail.com
authors.forename: Fernando
authors.initials: F
authors.lastname: Toledo
authors.forename: Juan Francisco
authors.initials: JF
authors.lastname: Silvestre
authors.forename: Laura
authors.initials: L
authors.lastname: Cuesta
authors.forename: Nuria
authors.initials: N
authors.lastname: Latorre
authors.forename: Almudena
authors.initials: A
authors.lastname: Monteagudo
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000485:Allergens / Q000009:adverse effects*; D001608:Beryllium / Q000009:adverse effects*; D002648:Child; D017449:Dermatitis, Allergic Contact / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests / Q000379:methods; D012189:Retrospective Studies; D013997:Time Factors; D055815:Young Adult
chemical_list: D000485:Allergens; C032776:beryllium chloride; D001608:Beryllium