Piedraia hortae brumpt fonseca and ara leao 1928 is the eti ological agent of. Piedraia hortae is a superficial fungus that exists in the soils of tropical and subtropical environments and affects both sexes of all ages. Black piedra is a fungal infection of the hair shafts of humans and animals caused by piedraia hortae. The mycoses with the highest incidencecandidiasis and dermatophytosisare caused by fungi that are frequent components of the normal human microbiota and highly adapted to survival on the human host.
You are free to share to copy, distribute and transmit the work, under the following conditions. Get an answer for human infectious diseases caused by fungi classified as superficial, cutaneous, subcutaneous, and systemic mycoses. The first is black piedra, which is caused by piedraia hortae. One of the colonies, on microscopic examination revealed round, dark brown, globus ascus confirmatory for piedraia hortae species d. What specific characteristics distinguish each of these. In 1865, beigel first described piedra in the human hair. White piedra must be distinguished from black piedra, in which tightly adherent black nodules form on the hair, particularly on the scalp.
Most pathogenic fungi are exogenous, their natural habitats being water, soil, and organic debris. C optical microscopy x100 identifying the ascus, round structures typical of parasitism caused by piedraia hortae. Growth and morphology of piedraia hortaa brumpt fonseca and area leao. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Nov 19, 2019 piedraia hortae is a superficial fungus that exists in the soils of tropical and subtropical environments and affects both sexes of all ages. Pdf superficial mycoses are fungal infections restricted to the stratum corneum and to the.
The reverse side of the colonies also revealed black color. Black piedra results from a particular fungal species called piedraia hortae. Introduction to mycology the term mycology is derived from greek word mykes meaning mushroom. This is a photomicrograph of the mycelium of the fungus piedraia hortae, magnified 475x, 1964. Koh mount of brown colored nodule revealed nondematiaceous, loosely arranged septate hyphae with arthroconidia and blastoconidia a. Files are available under licenses specified on their description page. Tinea nigra is typically located on the palmar surface of the hand or finger more commonly or on the plantar surface of the foot, but other sites including the neck or trunk can be involved. Piedraia hortae is a dermatophyte and causes a superficial fungal infection known as black piedra, which causes the formation of black nodules on the hair shaft and leads to progressive weakening of the hair. Small hypo or hyperpigmented macules on the upper trunk, arms, chest, shoulders, face, neck interferes with. Ay016366 piedraia hortae gu214468 piedraia quintanilhae. Pdf white piedra, black piedra, tinea versicolor, and tinea nigra. Ppt superficial mycoses powerpoint presentation free to. Infections are usually localized to the scalp but may also be seen on hairs of the beard, moustache and pubic hair. Septate hypea, budding annelidesin clusters ringed marks.
A patient with clinical lesion of black piedra and. May 31, 2019 aspergilosis broncopulmonar alergica pdf allergic bronchopulmonary aspergillosis abpa is at the mild end of the spectrum of disease caused by pulmonary aspergillosis and can be classified as. Trichosporon inkin and trichosporon mucoides as unusual. Piedraia hortae, is the causative agent for black piedra, a superficial fungal infection of the hair shaft. Ultrastructural aspect of keratinolytic activity of piedra pdf. Piedraia hortae stock photography, royaltyfree photos. Malassezia furfur exophiala werneckii trichosporon beigelii piedraia hortae 7. Aug 21, 2017 superficial mycoses and dermatophytosis predisposing factors. Its structure, growth, diseases, and their treatment.
Fungal classification 2 free download as powerpoint presentation. Trichosporon asahii an overview sciencedirect topics. E causada pelo fungo demacio ascomiceto piedraia hortae. The ability of fungi to invade plant and animal tissue was observed in early 19th century but the first documented. Pathogenic fungi in humans and animals second editionedited bydexter h.
Pathogenic fungi in humans and animals pdf free download. Apr 06, 2020 in 1865, beigel first described piedra in the human hair. Ppt dermatophytosis and superficial mycoses powerpoint. The term mycoses refers to infections that are caused by fungi. Piedra is an asymptomatic fungal infection of the hair shaft, resulting in the formation of nodules of different hardness on the infected hair. Light microscopy of the hair forms an important bedside clinical tool for the diagnosis of various disorders affecting the hair. Small hypo or hyperpigmented macules on the upper trunk, arms, chest, shoulders, face, neck interferes with melanin production. The fungus grows very slowly, forming dark hyphae, which contain chlamydoconidia cells and black colonies when grown on agar. Apr 01, 2001 read a patient with clinical lesion of black piedra and mycological diagnosis of white piedra, clinical microbiology newsletter on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Pronunciation of piedraia hortae with 2 audio pronunciations and more for piedraia hortae. To access free multiple choice questions on this topic, click here. Black piedra caused by piedraia hortae is common in tropical climates of central and south america and south east asia whereas white piedra caused by trichosporon species is more common in temperate and semitropical climates like europe, japan and parts of south usa. The lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus. All structured data from the file and property namespaces is available under the creative commons cc0 license.
The infection comprises of nodular concretions over the hair. Black piedra piedraia hortae superficial infection of hair shafts causes shafts to break white piedra trichosporon species superficial infection of hair shafts diagnosis observation of hyphae and arthroconidia. Sister to the piedraia xanthoriicola clade in this analysis, but without bootstrap support, are two species of the hyphomycete genus friedmanniomyces, which has no known sexual state. Molecular phylogenetic studies on the lichenicolous.
Human infectious diseases caused by fungi classified as. Recent ultrastructural research on the course of hair infection and keratin destruction has clearly demonstrated that piedraia hortae act as keratinolytic fungi, dissolving the cuticular as well. Fungicidal compounds and methods of their use the lens. Hair abnormalities can be seen in the primary diseases affecting the hair or as a secondary involvement of hair in diseases affecting the scalp. Hair abnormalities also form a part of various genodermatoses and syndromes. Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience.
521 958 1254 1097 1054 85 1226 832 661 630 72 909 1232 1289 320 1482 1249 1576 580 1041 1319 1028 22 1301 65 186 910 220 1452 989 1255 1126 583 1548 934 103 773 670 894 125 1142 941 456 1450