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Epidemiologic differences between the two varieties of Cryptococcus neoformans.

K J Kwon-Chung, J E Bennett

    American Journal of Epidemiology
    |July 1, 1984
    PubMed
    Summary
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    Cryptococcus neoformans varieties show distinct global distribution patterns. Cryptococcus neoformans var. gattii is primarily found in tropical and subtropical areas, unlike var. neoformans.

    Area of Science:

    • Medical Mycology
    • Infectious Diseases
    • Epidemiology

    Background:

    • Cryptococcus neoformans is a fungal pathogen causing cryptococcosis.
    • Two varieties, C. neoformans var. neoformans and C. neoformans var. gattii, are recognized.
    • Understanding their geographic distribution is crucial for public health.

    Purpose of the Study:

    • To investigate the worldwide distribution of Cryptococcus neoformans varieties.
    • To identify geographical patterns and prevalence of different serotypes.

    Main Methods:

    • Analysis of 628 clinical isolates of Cryptococcus neoformans.
    • Inclusion of 97 additional isolates from other laboratories.
    • Geographic mapping of isolate origins and serotyping.

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    Main Results:

    • C. neoformans var. neoformans is globally distributed, dominant in temperate regions.
    • C. neoformans var. gattii shows high prevalence in tropical and subtropical regions.
    • Serotype A (var. neoformans) comprised 70% of isolates; Serotype D was common in Europe.

    Conclusions:

    • Cryptococcus neoformans var. gattii prevalence is strongly linked to tropical and subtropical climates.
    • Geographic distribution of C. neoformans varieties and serotypes varies significantly worldwide.
    • Further research into environmental factors influencing distribution is warranted.