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Cryptococcal antigen negative meningoencephalitis in HIV/AIDS.

Daniel B Chastain1, Jeannette Guarner2, Carlos Franco-Paredes3

  • 1University of Georgia College of Pharmacy, 1000 Jefferson Street, Albany, GA, USA; Department of Pharmacy, Phoebe Putney Memorial Hospital, 417 3rd Avenue, Albany, GA, USA.

Diagnostic Microbiology and Infectious Disease
|August 9, 2017
PubMed
Summary

Diagnosing central nervous system cryptococcosis can be challenging, especially with unusual Cryptococcus strains. New diagnostic methods are crucial for detecting infections caused by low-capsule Cryptococcus strains in immunocompromised patients.

Keywords:
AIDSCryptococcal antigenCryptococcal meningoencephalitisCryptococcusHIV

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Area of Science:

  • Medical Mycology
  • Infectious Diseases
  • Neuroscience

Background:

  • Central nervous system (CNS) cryptococcosis is a serious fungal infection, particularly in individuals with HIV/AIDS.
  • Diagnosis traditionally involves cerebrospinal fluid (CSF) analysis, but rapid antigen detection assays have improved clinical utility.
  • Cryptococcus neoformans and Cryptococcus gattii are the primary causative agents, typically characterized by a polysaccharide capsule.

Observation:

  • A case study of an HIV-infected African-American man presenting with cryptococcal meningoencephalitis is detailed.
  • The causative Cryptococcus strain exhibited minimal to no capsule production, a rare characteristic.
  • Standard diagnostic methods, including antigen detection assays, may face challenges with such acapsular or hypocapsular strains.

Findings:

  • The presence of an acapsular or hypocapsular Cryptococcus strain complicates the diagnosis of CNS cryptococcosis.
  • Standard lateral flow assays, designed to detect capsular antigens, might yield false-negative or indeterminate results in such cases.
  • This highlights the limitations of current antigen-based diagnostics when faced with Cryptococcus variants lacking significant capsule formation.

Implications:

  • Clinicians should consider the possibility of acapsular Cryptococcus strains in patients with suspected CNS cryptococcosis, especially if initial diagnostic tests are negative.
  • Further research is needed to develop and validate diagnostic tools capable of detecting even minimally encapsulated or non-encapsulated Cryptococcus species.
  • Improved diagnostic strategies are essential for timely and effective treatment of cryptococcal meningoencephalitis, particularly in vulnerable populations.