Morphologic characteristics of 45 Microsporum canis strains
DOI:
https://doi.org/10.33885/sf.2009.3.1043Keywords:
dermatophytes, Microsporum audouiniiAbstract
Dermatophytes are pathogen fungi of skin and its appendages. One of them,
Microsporum spp. has micro and macroscopic characteristics mainly based on the shape and
size of macroconidia and echinulations that allow the identification of the species. The macro
and micromorphological characteristics of 45 M. canis strains were analized with the
intention of classifying them into subspecies. All samples had a previous positive direct exam
with KOH and were cultured in both Sabouraud dextrose agar with antibiotic and rice media.
Thirty five percent grew by the second week. A white velvety colony with a yellowish color on
the reversal side was the usual phenotype. Fifteen percent of cultures on rice media were
negative. The typical M. canis morphology was seen in 81.1% and macroconidia had an
average of 9.08 septa. Sixteen cases had a mixed morphology. Microsporum canis strains are
easily identified in most cases, however, in atypical specimens, M. audouinii should be ruled
out.
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