Fatal Cryptococcus gattii meningitis with negative cryptococcal antigen test in a HIV-non-infected patient

Area of Science:

• Mycology
• Infectious Diseases
• Clinical Neurology

Background:

• Cryptococcus gattii is a fungal pathogen known to cause cryptococcosis, primarily affecting the central nervous system and lungs.
• While often associated with immunocompromised individuals, C. gattii infections can also occur in immunocompetent hosts, presenting significant morbidity.

Observation:

• A case of rapidly fatal Cryptococcus gattii meningitis is presented.
• The patient was an adult male without HIV infection but presented with significant CD4 lymphopenia.
• Crucially, the patient tested negative for the standard cryptococcal antigen test.

Findings:

• This case demonstrates a fatal C. gattii meningitis in an HIV-negative individual with CD4 lymphopenia.
• The negative cryptococcal antigen test in this context suggests limitations in current diagnostic methods for certain patient populations.
• The rapid progression to fatality underscores the aggressive nature of C. gattii in susceptible individuals.

Implications:

• This case highlights the potential for C. gattii to cause severe disease in unexpected patient groups, including those with unexplained CD4 lymphopenia.
• It suggests that cryptococcal antigen testing may not be universally sensitive, necessitating consideration of alternative diagnostic approaches.
• Further research into less explored risk factors and broader epidemiological surveillance for C. gattii is warranted to improve clinical recognition and patient outcomes.