[Cryptococcus neoformans isolated from patients with AIDS]

Area of Science:

• Mycology
• Infectious Diseases
• Immunocompromised Hosts

Background:

• Cryptococcosis is a leading opportunistic fungal infection in patients with Acquired Immunodeficiency Syndrome (AIDS).
• Cryptococcus neoformans var. neoformans is more commonly isolated from AIDS patients than var. gattii.
• Neurocryptococcosis, a severe form of cryptococcosis affecting the central nervous system, poses a significant threat to individuals with compromised immune systems.

Purpose of the Study:

• To investigate the prevalence and etiological agents of neurocryptococcosis in patients with AIDS.
• To identify the specific varieties of Cryptococcus neoformans isolated from cerebrospinal fluid (CSF) of AIDS patients.

Main Methods:

• Cerebrospinal fluid samples were collected from fifty patients diagnosed with neurocryptococcosis and AIDS.
• Fungal isolation was performed using Sabouraud agar medium.
• Identification of Cryptococcus neoformans and its varieties (neoformans and gattii) involved microscopic and macroscopic examinations, biochemical tests (agar Sabouraud, agar niger, Christensen's urea medium), and a specific colorimetric reaction on glycine-L-canavanina-bromothymol blue agar.

Main Results:

• Cryptococcus neoformans was successfully isolated from the CSF of all fifty patients studied.
• The isolates were identified as Cryptococcus neoformans var. neoformans in 47 patients (94%).
• Cryptococcus neoformans var. gattii was identified in 3 patients (6%).

Conclusions:

• Both Cryptococcus neoformans var. neoformans and var. gattii are etiological agents of neurocryptococcosis in patients with AIDS.
• The findings underscore the importance of considering both varieties in the diagnosis and management of neurocryptococcosis in this vulnerable population.
• Further research may elucidate differential virulence or treatment responses between the two varieties in AIDS patients.