title: HIV combination therapy: partial immune restitution unmasking latent cryptococcal infection.
abstract: OBJECTIVE
  To describe two cases of cryptococcal meningitis and one re-exacerbation of Cryptococcus-associated meningitis occurring in temporal association with commencement of highly active antiretroviral therapy (HAART) in patients with advanced HIV infection (CD4 cells < 50 x 10(6)/l), which suggests that partial immune restitution can facilitate development of clinically apparent meningitis in response to Cryptococcus or its antigen.
  
  
  METHODS
  All HIV-infected patients with culture-proven cryptococcal meningitis diagnosed at a tertiary referral centre specialist infectious diseases unit from 1 January 1996 to 31 December 1996 were reviewed to examine the clinical and immunological parameters prior to and after commencing antiretroviral therapy.
  
  
  RESULTS
  Three patients were diagnosed with clinically apparent meningitis within 7-39 days of changing or altering antiretroviral combination therapy consisting of zidovudine or stavudine, in combination with lamivudine and saquinavir. All patients had CD4 cell counts below 50 x 10(6)/l at initiation of therapy. Following institution of HAART, evidence of immune restitution was suggested by the following: (i) significant increases (3.7-14-fold) in numbers of CD4 cells (all three patients), (ii) significantly reduced (> 2-4 log10 reduction) HIV viral loads (two out of three patients), and (iii) prominent inflammatory changes in cerebrospinal fluid (white blood cells > 10 x 10(6)/l) at diagnosis (two out of three patients).
  
  
  CONCLUSIONS
  Our report suggests that in patients with advanced HIV infection, partial immune restitution induced by HAART can precipitate onset of clinically apparent meningitis in those patients with latent cryptococcal central nervous system infection or with residual cryptococcal antigen present in the cerebrospinal fluid.
authors.affiliation: Infectious Diseases Unit, Wattlebrae, Royal Brisbane Hospital, Herston, Queensland, Australia.
authors.forename: M L
authors.initials: ML
authors.lastname: Woods
authors.forename: R
authors.initials: R
authors.lastname: MacGinley
authors.forename: D P
authors.initials: DP
authors.lastname: Eisen
authors.forename: A M
authors.initials: AM
authors.lastname: Allworth
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000175:diagnosis / Q000276:immunology* / Q000473:pathology; D019380:Anti-HIV Agents / Q000009:adverse effects / Q000627:therapeutic use*; D018791:CD4 Lymphocyte Count; D002555:Cerebrospinal Fluid / Q000382:microbiology; D003453:Cryptococcosis / Q000175:diagnosis / Q000276:immunology* / Q000473:pathology; D003454:Cryptococcus / Q000302:isolation & purification; D004359:Drug Therapy, Combination; D015658:HIV Infections / Q000188:drug therapy* / Q000276:immunology; D006801:Humans; D016921:Meningitis, Fungal / Q000175:diagnosis / Q000276:immunology* / Q000473:pathology
chemical_list: D019380:Anti-HIV Agents