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Cryptococcal Meningitis

Cryptococcal Meningitis

Cryptococcal meningitis is a life-threatening opportunistic infection predominantly associated with HIV/AIDS, accounting for over 100,000 deaths annually worldwide. However, it also affects individuals with other forms of immunosuppression, including those undergoing immunosuppressive therapy, organ transplant recipients, patients with innate immunodeficiencies, and individuals with hematological disorders. The infection is caused mainly by Cryptococcus neoformans and Cryptococcus gattii,...

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Related Experiment Video

Updated: Jul 6, 2026

Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans

Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans

Published on: March 19, 2015

[Urease activity in Cryptococcus neoformans and Cryptococcus gattii].

Josep M Torres-Rodríguez¹, Eidi Alvarado-Ramírez, Ricardo Gutiérrez-Gallego

¹Unidad de Investigación en Enfermedades Infecciosas y Micologia, Institut Municipal d' Investigació Mèdica, Unidad Docente del Instituto Municipal de Asistencia Sanitaria, Unversitat Autònoma de Barcelona, Spain. jmtorres@imim.es

Revista Iberoamericana De Micologia

|March 15, 2008

Summary

This summary is machine-generated.

Cryptococcus neoformans exhibits significantly higher urease enzyme production compared to Cryptococcus gattii. This study quantifies urease activity, revealing C. neoformans as a more potent producer, impacting fungal virulence.

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Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body

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Last Updated: Jul 6, 2026

Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans

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Published on: March 19, 2015

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Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body

Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body

Published on: January 11, 2018

Area of Science:

Mycology
Enzymology
Infectious Diseases

Background:

Urease is a key virulence factor in Cryptococcus neoformans infections.
Quantitative differences in urease production between Cryptococcus neoformans and Cryptococcus gattii are not well-documented.
Understanding urease activity is crucial for assessing fungal pathogenicity.

Purpose of the Study:

To quantitatively compare urease production in Cryptococcus neoformans and Cryptococcus gattii.
To determine if significant differences in urease activity exist between these two species.

Main Methods:

Twenty-five isolates of C. neoformans and 19 isolates of C. gattii were cultured.
Urease activity was detected using Christensen urea broth medium over 72 hours.
A standardized reference (50% activity of commercial jack bean urease, A550=0.215) classified isolates as low or high urease producers.

Main Results:

A statistically significant difference (p=0.016) in urease production was observed between the species.
76% of C. neoformans strains were high urease producers.
Only 15.8% of C. gattii strains were classified as high urease producers.

Conclusions:

Cryptococcus neoformans demonstrates significantly higher urease production compared to Cryptococcus gattii.
This finding suggests a potential difference in virulence mechanisms between the two species.
Further investigation into other virulence factors of C. gattii is warranted to explain its pathogenicity.