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Medical Mycology Black Piedra and White Piedra.pptx
- 1. Black Piedra Presented by A.R. Deborah (BP211501) I M.Sc. Applied Microbiology Sacred Heart College (A) Tirupattur
- 2. GENERAL CHARACTERISTICS • Affects the hair, primarily the scalp is Black Piedra. • Black Piedra caused by Piedraia hortae. • This fungal infection of the hair is characterised by the presence of firm, irregular nodules along the hair shaft. • These nodules are composed of fungal elements cemented together on the hair.
- 3. PATHOGENESIS • It is also known as Trichomycosis nodosa. • The fungal elements are attached to the hair shaft to form nodules along the hair shaft to form nodules along the hair shaft. • The predominantly affects scalp hair, also involvement of beard, mustache and pubic hairs.
- 4. CLINICAL MANIFESTATIONS • Black Piedra presents as small, dark nodules that surrounds the hair shafts. • It is asymptomatic and generally involves the scalp.
- 5. LABORATORY DIAGNOSIS • Microscopic examination of nodule reveal branched, pigmented hyphae held together by a cement like substance Piedraia hortae. • Culture (Mycologic media) – Very slow growth observed at 25 ͦ C and may begin as yeast like colony, later becoming velvety as hyphal develop. • Asci may be observed microscopically, ranging from 4 to 30 µm containg up to 8 ascospores.
- 7. TREATMENT • Hair cut, proper and regular washing.
- 8. White Piedra
- 9. GENERAL CHARACTERISTICS • White Piedra is a superficial infection of hair caused by yeast fungi of the genus Trichosporon : T. inkin, T. asahii, or T. mucoides. • Microscopic examination reveals hyphal elements, arthroconidia (rectangular cells resulting from the fragmentation of hyphal cells) and blastoconidia (budding yeast cells). • This condition occurs in tropical regions and due to poor hygiene.
- 10. PATHOGENESIS • The pathogenesis of this infection is still unclear, but it is likely to result from synergy between the fungi and coryneform bacteria.
- 11. CLINICAL MANIFESTATIONS • The primary symptoms of white Piedra are white-to-tan gelatinous, pearly nodules surrounding the hair shaft. • Asymptomatic • Found in facial hair and body hair (Mustaches, beards, eyelashes, eyebrows, armpit and pubic hair.
- 12. LABORATORY DIAGNOSIS • Microscopic examination – Observation of hyphae on affected hair (hair sample). • Mycolic media without cycloheximide Trichosporon sp. will form cream-colored, dry, wrinkled colonies within 48 to 72 hours upon incubation at room temperature. • Morphology on cornmeal agar – both arthroconidia and blastoconidia are present.
- 14. TREATMENT • Treatment may be accomplished by the use of tropical azoles • Improved hygiene • Shaving of the infected hair. • And should take necessity of medical treatment.
- 15. Thank you!!