The recurrent evolutionary emergence of asexual lineages within sexual zoo and anthropophilic dermatophyte species living in animalfrequented soil. The changing face of microsporum spp infections clinics in. As listed above, in superficial mycoses infection is localised to the skin, the hair, and the nails. Introduction microscopic morphology of the micro andor macroconidia is the most reliable identification character culture characteristics such as surface texture, topography and pigmentation are also a reliable criteria for identification. On every patient with pruritic or scaly skin what can i find. The fungi isolated in this study are reported to be either well known agents of mycosis or have been recovered from human and animal lesions such as microsporum gypseum, trichophyton rubrum, geotricum candidum, aspergillus flavus, fusarium oxysporum, chrysosporium. Trichophyton tonsurans, microsporum canis, and microsporum audouinii are most common. Microsporum spp are a relatively common fungal skin disease which causes ringworm in the skin of cattle species which affect cattle include.
Fungal infections caused by m canis, followed by m gypseum and m hominis, involving skin and its appendages, represent one of the most common diseases worldwide and a recalcitrant problem in dermatology that demands appropriate diagnostic. The changing face of microsporum spp infections request pdf. Andrea kalus, in the travel and tropical medicine manual fifth edition, 2017. Dermatophytes are divided into three genera, trichophyton, epidermophyton and microsporum, and have the ability to invade keratinized tissues, such as the hair, skin and nails of humans as well as other animals. It is part of a group of fungi known as dermatophytes. Microsporum audouinii an overview sciencedirect topics. Nota 39 dermatomicosis pormicrosporum canis en humanos. Microsporum definition of microsporum by medical dictionary.
Phosphatidylethanolamine increased with a simultaneous decrease in phosphatidylserine. The genus microsporum includes some 17 species, of which 5 are primarily isolated from humans and 7 primarily from animals. Uncomplicated infections are characterized by circular areas of alopecia and crusting with or without follicular papules, usually around the face, neck, and forelimbs. Tinea capitis, or ringworm of the scalp, is mainly a disease of children caused by microsporum or trichophyton species. The etiologic agents of dermatophytosis are classified, along with some nonpathogenic relatives, in the anamorphic genera trichophyton, microsporum, and epidermophyton. Microsporum canis, for which the natural hosts are cats and dogs, is the most prevalent zoophilic agent causing tinea capitis and tinea corporis in humans. An example is ringworm or tinea, an infection of the skin by a dermatophyte. Jan 18, 2015 practical identification of common dermatophytes kimaiga h. Trichophyton tonsurans, microsporum canis, and microsporum audouinii are most common the condition presents with hair loss alopecia, usually with scale.
Efficacy of eight commercial disinfectants against microsporum canis and trichophyton spp. The third case was manifested in a facial lesion of a patient from philadelphia. Disinfectant for microsporum and trichophyton spores. Microsporum persicolor infection in the united states jama. Microsporum is a fungal genus which is most famously responsible for ringworm, a fungal infection which can be observed in both humans and animals. Pcr assay for the rapid detection and identification of trichophyton spp. Macroconidia are hyaline, multiseptate, variable in form, fusiform, spindleshaped to.
Microsporum nanum was first described in 1954 by fuentes, aboulafia, and vidal, 1 who isolated a dwarf form of microsporum gypseum from a case of tinea capitis kerion in an 8yearold white boy. Microsporum canis is a worldwide diffused zoophilic dermatophyte which causes clinical. General characteristics dermatophytes are cutaneous fungi which infect only the keratinized tissues by liberting keratinase enzyme which helps them to invade into keratinized tissue like stratum corneum layer of skin, hair and nail. The results of seven works concluded that ter was more effective for tinea capitis primarily caused by trichophyton species. Microsporum canis is a fungal species that causes numerous forms of disease. Seven months later these same investigators 1 isolated a similar strain from a glabrous skin infection in an adult.
Microsporum can be carried on cats, dogs, and other animals, and the. Macroconidia are hyaline, multiseptate, variable in form, fusiform, spindleshaped to obovate. Ringworm is most common in calves, characterised by nonpruritic periocular lesions and alopecia. Microsporum synonyms, microsporum pronunciation, microsporum translation, english dictionary definition of microsporum. For example, the dermatophyte microsporum canis infects animals. Microsporum audouinii is an anthropophilic fungus causing noninflammatory infections of the scalp and skin, especially in children. Ringworm infections caused by microsporum persicolor in persons from eastern united states were described. Onychomycosis is the commonest nail disease worldwide accounting for 50% of all nail disorders in some studies.
Ringworm refers to the characteristic central clearing. The condition presents with hair loss alopecia, usually with scale. Microsporum species may form both macro and microconidia, although they are not always present. Changes in phospholipids of microsporum species in the. Invaded hairs show an ectothrix infection and usually fluoresce a bright greenishyellow under woods ultraviolet light. This fact makes this pathogen both anthrophilic and zoophilic in nature.
Cultures are mostly granular to cottony, yellowish to brownish, with a creamcoloured or brown colony reverse. Therapy and antifungal susceptibility profile of microsporum canis. Microsporum nanum was first described in 1954 by fuentes, aboulafia, and vidal,1 who isolated a dwarf form of microsporum gypseum from a case of tinea capitis kerion in an 8yearold white boy. Pcr test for microsporum canis identification medical. Microsporum audouiniiy microsporum ferrugineum, aunque este hecho no guarda relacion con resistencia in vitro primaria o secundaria 17. Ethanol supplementation to the growth medium of microsporum gypseum and microsporum cookie resulted in changes in phospholipid composition and degree of unsaturation of their fatty acids without affecting the growth rate of the organism. The natural habitat of some of the microsporum spp. Microsporum canis is a pathogenic, asexual fungus in the phylum ascomycota that infects the.
Involvement of the toenails was observed in 4 cases, 3 by m. Efficacy of eight commercial disinfectants against. Microsporum canis produces infections of scalp and body sites, creating highly inflammatory lesions associated with hair loss. Clinically, a microsporum canis infection appears as multiple round exudative lesions with scales and crusts, mostly along with the periphery of erythema. The aims of this study were to test in vitro the activity of thymol, eugenol, estragole and anethole and some omethylderivatives methylthymol and methyleugenol against candida spp. Infection by this species can often be detected clinically using woods lamp, which causes infected tissues to fluoresce bright green fluorescence is attributed to metabolite pteridine, which is produced by the fungus in actively growing hairs. Significant changes in epidemiology, etiology, and the clinical pattern of mycotic infections caused by microsporum spp have been observed in recent years. Uncomplicated infections are characterized by circular areas of alopecia and crusting with or without follicular. Population structure and evolutionary origins of microsporum canis. Nota 39 dermatomicosis pormicrosporum canis en humanos y animales. Disease presentation, risk factors and treatment responses in an urban population.
An outbreak of dermatophytosis in pigs caused by microsporum canis. Microsporum is a genus of fungi that causes tinea capitis, tinea corporis, ringworm, and other dermatophytoses fungal infections of the skin. Request pdf the changing face of microsporum spp infections significant changes in. Mar 01, 2020 microsporum is a fungal genus which is most famously responsible for ringworm, a fungal infection which can be observed in both humans and animals. Some species of microsporum and trichophyton produce arthroderma as their teleomorph. Microsporum y trichophyton son patogenos humanos y animales. The recorded connections between the teleomorphic sexual and anamorphic asexual states of the dermatophytes as well as the dermatophytoids are discussed in this chapter. Efficacy of eight commercial disinfectants against microsporum canis and trichophyton spp infective spores on an experimentally contaminated textile surface. Microsporum is known to be a causative agent for dermatophytosis, cutaneous mycoses, tinea capitis and tinea corporis ringworm. Microsporum canis reproduces by means of two conidial forms, large, spindleshaped, multicelled macroconidia and small, singlecelled microconidia. In recent years there has been an increasing search for new antifungal compounds due to the side effects of conventional antifungal drugs and fungal resistance. In the laboratory, they grow efficiently on sabouraud dextrose agar, at 25. Microsporum a genus of fungus of the family moniliaceae.
Microsporum forms both macroconidia large asexual reproductive structures and microconidia smaller asexual reproductive structures on short conidiophores. A taxonomic genus within the family arthrodermataceae fungus that causes skin infections. All structured data from the file and property namespaces is available under the creative commons cc0 license. A spectrophotometric reading was performed on a microplate reader for. Canine dermatophytoses are commonly caused by microsporum spp. Merck vet manual saxena p et al 2004 diversity of keratinophilic mycoflora in the soil of agra india. View enhanced pdf access article on wiley online library html view download pdf for offline viewing. The name refers to an asexual formtaxon that has been associated with four related biological species of fungi. Though mostly well known for ringworm in pets and other animals, it is also known to infect humans. Files are available under licenses specified on their description page. Ungpakorn r1, ayutyanont t, reangchainam s, supanya s. Microsporum is a filamentous keratinophilic fungus d ermatophytes. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
Microsporum gypseum definition of microsporum gypseum by. The changing face of microsporum spp infections clinics. In 1999, a case of dermatophytosis was described in three wild felids in florida, usa. Microsporum canis infection is zoonotic and is mostly transferred by cats. Once the cause of epidemics of tinea capitis in europe and north america, it is now less common. Microsporum persicolor infection in the united states. Microsporum canis, antifungal susceptibility testing, broth microdilution, etest and disk. View your records of employment apply for a social insurance number sin. Oct 07, 20 this page was last edited on 7 october 20, at 15. Arthroderma now contains 21 species, ctenomyces one species, epidermophyton one species, lophophyton one species, microsporum three species, nannizzia nine species and trichophyton 16 species.
Slides, cover slips, scalpel blade, mineral oil, microscope. Microsporum infects the skin and the hair, but seldom infects nails. Microsporum gypseum is a soilassociated dermatophyte that occasionally is known to colonise and infect the upper dead layers of the skin of mammals. Macroconidia are hyaline, multiseptate, with thick rough cell walls, and are clavate, fusiform or spindleshaped. Microsporum definition of microsporum by the free dictionary.
Find, read and cite all the research you need on researchgate. The previous treatments modified her skin lesions, which made it more difficult to make an accurate diagnosis. Microsporum canis is a particularly well known species in this genus, although several other species are also linked with ringworm and other skin problems, in some patients. Microsporum canis infection mimics pemphigus erythematosus. Three specimens of cougar puma concolor, one of them infected by m.
1036 701 719 944 373 420 963 1313 229 1386 11 1164 546 1488 535 429 282 18 589 652 1329 1049 567 758 27 363 1493 798 361 137 1212 421 1360 557