title: Reliability of a history of previous varicella infection in adults.
abstract: BACKGROUND
  Apparent second episodes of varicella are reported in immunocompetent hosts, but laboratory confirmation of prior immune status has rarely been possible.
  
  
  OBJECTIVE
  To evaluate adult patients with varicella who claimed to have had previous varicella to determine whether they had true second episodes or primary cases with inaccurate clinical histories.
  
  
  METHODS
  Adult subjects with varicella who enrolled in an antiviral treatment trial were interviewed about a history of varicella. The clinical course of varicella was documented prospectively in all subjects. Serum samples that predated the acute illness were obtained from the US Navy's central serum storage facility for subjects who reported a previous episode of varicella. These stored samples were tested in parallel by enzyme-linked immunosorbent assay, latex agglutination, and Western blot for IgG antibodies to varicella-zoster virus (VZV).
  
  
  METHODS
  Twenty military personnel with varicella and a history of the disease.
  
  
  METHODS
  A military hospital in San Diego, Calif.
  
  
  METHODS
  Presence or absence of antibodies to VZV.
  
  
  RESULTS
  Twenty (10.8%) of 184 adults with serologically confirmed acute varicella reported a prior history of varicella. The clinical course of these 20 patients did not differ from those with no history of varicella. Serum samples that had been collected a mean of 12.4 months (median, 12 months; range, 3 days to 34 months) before the incident episode were available for 19 subjects. All 19 serum samples lacked IgG antibodies to VZV.
  
  
  CONCLUSIONS
  A history of previous varicella infection in adults with varicella may not be reliable. True second episodes of varicella are probably rare in immunocompetent adults.
authors.affiliation: Internal Medicine Department, Naval Medical Center, San Diego, Calif 92134-5000, USA. mwallace@snd10.med.navy.mil
authors.forename: M R
authors.initials: MR
authors.lastname: Wallace
authors.forename: C J
authors.initials: CJ
authors.lastname: Chamberlin
authors.forename: L
authors.initials: L
authors.lastname: Zerboni
authors.forename: M H
authors.initials: MH
authors.lastname: Sawyer
authors.forename: E C
authors.initials: EC
authors.lastname: Oldfield
authors.forename: P E
authors.initials: PE
authors.lastname: Olson
authors.forename: A M
authors.initials: AM
authors.lastname: Arvin
mesh_terms: D000328:Adult; D000914:Antibodies, Viral / Q000097:blood*; D002644:Chickenpox / Q000276:immunology*; D014645:Herpesvirus 3, Human / Q000276:immunology*; D006801:Humans; D007121:Immunocompetence; D007074:Immunoglobulin G / Q000097:blood; D008487:Medical History Taking; D008889:Military Personnel; D012008:Recurrence; D012698:Serologic Tests
chemical_list: D000914:Antibodies, Viral; D007074:Immunoglobulin G