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Microscopic Findings of Macroconidia in Microsporum canis

Abstract





Keywords


Dermatophytes Macroconidia Microsporum canis



Microsporum canis is a part of family of fungi known as dermatophytes[1]. It can cause a scaly, crusted rash that may appear as round, erythematous patches on the skin[1]. Other symptoms and signs include hairless patch, scaling on the scalp, itching and blister-like lesion[1]. The natural reservoir of Microsporum canis is in cats and dogs[1]. It can also be transmitted to humans through direct and indirect contact with animals and fomites such as combs, brushes, hats, furniture, and linens etc[1].


In macroscopic morphology, Microsporun canis forms a white or yellowish, coarsely fluffy spreading colony with a distinctive hairy or feathery texture[2][3] (Fig. 1A). The reverse may characteristic pale tan to yellowish color which tends to turn brownish as it grows[2][3] (Fig. 1B). In microscopic morphology Microsporun canis septate hyphae which club shaped macroconidia may be found[2][4] (Fig. 1C). Macroconidia have relatively thick, coarsely roughened wall with knob-like end and contain internal cells divided into more than 6 compartments separated by broad cross-walls[2][4]. When we differentiate from other species of dermatophytes, consideration should be given to the characteristic macroscopic and microscopic findings of Microsporun canis.


Figure #1

Fig. 1. A, B, C. A, White colored coarsely fluffy spreading colony with distinctive feathery texture was seen on Sabouraud's dextrose agar after 5days on 25 B, From below, characteristic pale tan to yellowish colored stellated shaped colony C, Barrel-shaped, rough macroconidia have pointed ends which turn slightly to one side at the tip and have 6 cells (black arrow heads). (Methylene blue ×200)



Conflict of interest


In relation to this article, I declare that there is no conflict of interest.

References



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