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Related Experiment Videos

Epidemiologic differences among serotypes of Cryptococcus neoformans.

J E Bennett, K J Kwon-Chung, D H Howard

    American Journal of Epidemiology
    |June 1, 1977
    PubMed
    Summary
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    Cryptococcus neoformans serotype A is common in the US, found in infections and the environment. Serotypes B/C are rare except in Southern California, with their environmental source unknown.

    Area of Science:

    • Mycology
    • Infectious Diseases
    • Epidemiology

    Background:

    • Cryptococcus neoformans is an opportunistic fungal pathogen.
    • Different serotypes of C. neoformans exist, with varying geographic prevalence.
    • Understanding serotype distribution is crucial for epidemiology and treatment.

    Purpose of the Study:

    • To determine the prevalence and distribution of Cryptococcus neoformans serotypes in the USA.
    • To investigate the environmental sources of different serotypes.
    • To compare serotype prevalence in different geographic regions.

    Main Methods:

    • Isolates from human infections and environmental sources were collected.
    • Serotyping was performed on C. neoformans isolates.
    • Geographic data and source information (infection vs. environment) were recorded.

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    Main Results:

    • Serotype A was the most prevalent in the USA, found in 203/272 infections and 85/89 environmental isolates.
    • Serotypes B or C were infrequent causes of infection and not found in environmental samples, except in Southern California.
    • In Southern California, 25/49 infection isolates were serotypes B or C, but none were found in 67 environmental samples.
    • Serotype D appeared prevalent in Denmark and Italy (21/24 isolates).

    Conclusions:

    • Serotype A is the dominant C. neoformans serotype in the USA.
    • The environmental niche for serotypes B and C remains unidentified and differs from serotypes A and D.
    • Serotype D may be more common in certain European regions.