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An atypical Microsporum canis isolate.

S Mata Essayag1, C Hartung de Capriles

  • 1Sección de Micologia, Universidad Central de Venezuela, Caracas.

Mycoses
|November 1, 1991
PubMed
Summary

An atypical Microsporum canis strain caused tinea corporis in a child, exhibiting unusual macroconidia development. This Venezuelan isolate demonstrated hair perforation and stable infection in experimental inoculation.

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Area of Science:

  • Medical Mycology
  • Dermatophytosis Research
  • Fungal Pathogen Studies

Background:

  • Microsporum canis is a common cause of dermatophytosis.
  • Atypical presentations of fungal infections can pose diagnostic challenges.
  • Understanding fungal strain variability is crucial for effective treatment.

Purpose of the Study:

  • To describe an atypical strain of Microsporum canis.
  • To characterize its morphological and pathogenic properties.
  • To report the first atypical M. canis strain identified in Venezuela.

Main Methods:

  • Isolation and culturing of the fungal strain on Lactritmel and Sablac media.
  • Microscopic examination for macroconidia development.
  • In vitro hair perforation assay.
  • Experimental inoculation of a healthy volunteer.

Main Results:

  • The M. canis strain produced typical pigment but lacked characteristic macroconidia initially.
  • Scarce, rudimentary macroconidia developed after 6 weeks.
  • The strain exhibited hair perforating organs in vitro.
  • Experimental inoculation resulted in tinea with characteristic fluorescence and endothrix invasion.

Conclusions:

  • This study describes a novel atypical Microsporum canis strain from Venezuela.
  • The strain's unique morphological characteristics and pathogenicity were confirmed.
  • Findings highlight the importance of recognizing atypical fungal presentations in clinical practice.

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