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Autochthonous Blastomyces dermatitidis, India.

Anuradha Chowdhary, Gaston I Jofre, Ashutosh Singh

Emerging Infectious Diseases

|November 26, 2024

Summary

This summary is machine-generated.

Blastomyces dermatitidis, a fungus causing blastomycosis, was found in India, suggesting its endemic range is wider than previously known. This discovery highlights the need to reassess the global distribution of endemic fungal pathogens.

Keywords:

Blastomyces Blastomyces dermatitidis India blastomycosis fungal infections fungi phylogenetics

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Area of Science:

Medical Mycology
Infectious Diseases
Genomics

Background:

Blastomyces spp. are fungi responsible for blastomycosis, endemic in North America but with sporadic occurrences globally.
B. dermatitidis is the most common species, with most isolates reported from North America.
Genetic data on B. dermatitidis outside North America is scarce, limiting understanding of its global distribution.

Purpose of the Study:

To investigate the genetic characteristics of B. dermatitidis isolates from India.
To determine the origin and geographic range of B. dermatitidis.
To reassess the endemic distribution of B. dermatitidis and other endemic mycoses agents.

Main Methods:

Genome sequencing of three B. dermatitidis fungal isolates from patients in India.
Analysis of genetic differentiation within the B. dermatitidis species.
Clinical data review, including patient travel history.

Main Results:

Three B. dermatitidis isolates from India belonged to a genetically distinct lineage.
Patients had no travel history outside Asia, indicating autochthonous acquisition.
The findings suggest the presence of a local B. dermatitidis population in India.

Conclusions:

The endemic range of B. dermatitidis likely extends beyond North America to include Asia.
Autochthonous acquisition in India points to a previously unrecognized local reservoir.
A broader geographic assessment of endemic fungal pathogens is warranted.