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Dermatomycoses
Published in Raimo E Suhonen, Rodney P R Dawber, David H Ellis, Fungal Infections of the Skin, Hair and Nails, 2020
Raimo E Suhonen, Rodney P R Dawber, David H Ellis
The superficial fungal infection due to Piedra hortae and called black piedra is characterized by hard, black nodules that cling firmly to the affected hair shaft. Piedra (‘stone’ in Spanish) describes these gritty, adherent concretions, which are difficult to scrape off. Combing affected hairs with a metal comb is said to produce a characteristic rattling sound. Normal hair intervenes between the nodules and is not significantly weakened. As a result, nodules may be present throughout the length of the hair.
Trichosporon
Published in Rossana de Aguiar Cordeiro, Pocket Guide to Mycological Diagnosis, 2019
João Nobrega de Almeida Júnior
For the diagnosis of white piedra, cut off hair samples with nodules attached. Samples can be directly inoculated on Sabouraud dextrose agar (SDA, Difco, USA) with chloramphenicol (50 mg/L), or put between two clean glass slides, taped together, and sent to the mycology laboratory in a slide carrier. Both microscopic examination and culture must be requested (Jorgensen et al., 2015).
P
Published in Anton Sebastian, A Dictionary of the History of Medicine, 2018
Piedra Black piedra. Fungal disease of the skin noted in Columbia and studied by Nicalou Ozorio in 1876. The causative fungus was named Trichosporon hortae by Joseph Emile Brumpt (1877–1951) in 1913. White piedra in Europe, due to Trichosporon cutaneum, was described by German physician, Hermann Beigel (1830–1879) in 1865.
Promethazine inhibits efflux, enhances antifungal susceptibility and disrupts biofilm structure and functioning in Trichosporon
Published in Biofouling, 2023
Ana Luiza Ribeiro Aguiar, Bruno Nascimento da Silva, Nicole de Mello Fiallos, Lívia Maria Galdino Pereira, Maria Laína Silva, Pedro Freitas Santos Manzi de Souza, Fernando Victor Monteiro Portela, José Júlio Costa Sidrim, Marcos Fábio Gadelha Rocha, Débora Souza Collares Maia Castelo-Branco, Rossana de Aguiar Cordeiro
Invasive fungal infections affect more than 2 million people worldwide annually (Brown et al. 2012), being associated with high mortality and morbidity rates (Rauseo et al. 2020; Rodrigues and Nosanchuk 2020). Trichosporon spp. are yeast-like fungi, opportunistic pathogens known to cause superficial infections, such as white piedra, onychomycosis and tinea pedis (Colombo et al. 2011; Singh et al. 2019). Furthermore, Trichosporon species have been recognized as emerging agents of systemic infections (Guo et al. 2019; Singh et al. 2019; Ramírez and Moncada 2020). Risk factors for Trichosporon systemic infections include HIV infection, organ transplantation, diabetes, use of immunosuppressive agents and neutropenia (Li et al. 2020). Invasive trichosporonosis has been reported as the second most common yeast infection in patients with hematological malignancies, with mortality rates to up 90% (Colombo et al. 2011; Foster et al. 2018; Kourti and Roilides 2022).
Inhibitory effect of a lipopeptide biosurfactant produced by Bacillus subtilis on planktonic and sessile cells of Trichosporon spp.
Published in Biofouling, 2018
Rossana de Aguiar Cordeiro, Ewerton Weslley Caracas Cedro, Ana Raquel Colares Andrade, Rosana Serpa, Antonio José de Jesus Evangelista, Jonathas Sales de Oliveira, Vandbergue Santos Pereira, Lucas Pereira Alencar, Patrícia Bruna Leite Mendes, Bárbara Cibelle Soares Farias, Vânia Maria Maciel Melo, Zoilo Pires de Camargo, Débora de Souza Collares Maia Castelo-Branco, Raimunda Sâmia Nogueira Brilhante, José Júlio Costa Sidrim, Marcos Fábio Gadelha Rocha
Trichosporon spp. are common agents of superficial benign infections, such as white piedra and onychomychosis (Colombo et al. 2011). However, in immunocompromised patients, especially those with hematological malignancies, these fungi have been considered important agents of invasive infections (Richardson and Lass-Flörl (2008); Miceli et al. 2011). More than 50 species are recognized in the Trichosporon genus; six are more frequently associated with human infections: T. asahii, T. inkin, T. asteroides, T. cutaneum, and T. ovoides (Chagas-Neto et al. 2008; Colombo et al. 2011). The number of cases of invasive Trichosporon infections in immunocompromised patients has increased considerably in the past 20 years (Colombo et al. 2011; de Almeida Júnior and Hennequin 2016). In vulnerable patients, invasive trichosporonosis may have poor prognosis and lethality rates could exceed 50% (de Almeida Júnior and Hennequin 2016).