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1.
ABCS health sci ; 46: e021203, 09 fev. 2021. tab
Article in English | LILACS | ID: biblio-1147180

ABSTRACT

INTRODUCTION: The resistance of fungal species to drugs usually used in clinics is of great interest in the medical field. OBJECTIVE: To evaluate susceptibility and in vitro response of species of Trichophyton spp. to antifungal drugs of interest in clinical medicine. METHODS: 12 samples of clinical isolates from humans were used, nine of T. mentagrophytes and three of T. tonsurans. Susceptibility tests were performed according to the agar diffusion (AD) and broth microdilution (BM) methods. RESULTS: In the AD method, the species T. tonsurans presented a percentage of sensitivity of 33% in relation to amphotericin B and 66% to itraconazole, with 100% resistance to ketoconazole and fluconazole. T. mentagrophytes also showed 100% resistance to ketoconazole in this technique, with 11% sensitivity to ketoconazole, 22% to itraconazole and 22% of samples classified as sensitive dose dependent. In the MC method, the species T. tonsurans presented a sensitivity percentage of 66%, 55% and 33% in relation to ketoconazole, fluconazole and itraconazole, respectively. The T. mentagrophytes species presented sensitivity percentages of 11%, 11%, 33% and 55% for amphotericin B, itraconazole, ketoconazole and fluconazole, respectively. CONCLUSION: There was resistance in vitro of the species of T. mentagrophytes and T. tonsurans against the antifungal fluconazole and relative resistance against ketoconazole in the AD method. In BM, however, important percentages of sensitivity were observed for the two species analyzed in relation to the antifungals fluconazole and ketoconazole when compared to itraconazole and amphotericin B.


INTRODUÇÃO: A resistência de espécies fúngicas às drogas usualmente empregadas no meio clínico é motivo de grande interesse na área médica. OBJETIVO: Avaliar susceptibilidade e resposta in vitro de espécies de Trichophyton spp. a drogas antifúngicas de interesse em clínica médica. MÉTODOS: Foram utilizadas 12 amostras de isolados clínicos de humanos, sendo nove de T. mentagrophytes e três de T. tonsurans. Foram realizados testes de susceptibilidade segundo os métodos de difusão em ágar (DA) e microdiluição em caldo (MC). RESULTADOS: No método de DA, a espécie T. tonsurans apresentou percentual de sensibilidade de 33% em relação à anfotericina B e de 66% ao itraconazol, com 100% de resistência frente ao cetoconazol e ao fluconazol. A espécie T. mentagrophytes também apresentou 100% de resistência frente ao cetoconazol nesta técnica, com 11% de sensibilidade ao cetoconazol, 22% ao itraconazol e 22% das amostras classificadas como sensível dose dependente. No método de MC, a espécie T. tonsurans apresentou percentual de sensibilidade de 66%, 55% e 33% em relação ao cetoconazol, fluconazol e itraconazol, respectivamente. A espécie T. mentagrophytes apresentou percentuais de sensibilidade de 11%, 11%, 33% e 55% para anfotericina B, itraconazol, cetoconazol e fluconazol, respectivamente. CONCLUSÃO: Houve resistência in vitro das espécies do T. mentagrophytes e T. tonsurans frente ao antifúngico fluconazol e resistência relativa frente ao cetoconazol no método de DA. Na MC, no entanto, foram observados importantes percentuais de sensibilidade das duas espécies analisadas frente aos antifúngicos fluconazol e cetoconazol quando comparadas ao itraconazol e à anfotericina B.


Subject(s)
Trichophyton/drug effects , Microbial Sensitivity Tests , Drug Resistance, Fungal , Disease Susceptibility/microbiology , Antifungal Agents/pharmacology , Tinea/microbiology , Tinea/drug therapy , Colony Count, Microbial , Fluconazole/pharmacology , Amphotericin B/pharmacology , Itraconazole/pharmacology , Ketoconazole/pharmacology
2.
An. bras. dermatol ; 95(3): 332-335, May-June 2020. graf
Article in English | ColecionaSUS, LILACS, ColecionaSUS | ID: biblio-1130874

ABSTRACT

Abstract Tinea capitis comprising of tinea favosa and kerion is mostly seen in school-aged children. Some tinea capitis often presented with insignificant findings under the naked eyes are easily overlooked. The authors describe an unusual case of tinea capitis caused by Trichophyton violaceum. The patient was an 8-year-old girl, with a history of pruritus on the scalp for more than one year. A diagnosis of tinea capitis was confirmed by clinical examination aided by dermoscopy, calcium fluorescent microscopy and culture. Comma and corkscrew hairs are two specific dermoscopic patterns of tinea capitis. The patient was treated with systemic itraconazole, topical application with 1% naftifine 0.25% ketoconazole cream followed after daily hair wash with 2% ketoconazole shampoo for 8 weeks.


Subject(s)
Humans , Female , Child , Tinea Capitis/diagnostic imaging , Calcium , Microscopy, Fluorescence/methods , Tinea Capitis/pathology , Trichophyton/isolation & purification , Reproducibility of Results , Dermoscopy/methods
3.
Annals of Dermatology ; : 109-114, 2020.
Article in English | WPRIM | ID: wpr-811088

ABSTRACT

BACKGROUND: Tinea capitis is a cutaneous infection of dermatophytes and predominant in children. Although tinea capitis in Korea is controlled by oral antifungal medications and concerted public health initiatives, it's still a health issue.OBJECTIVE: To investigate changes in the epidemiological and mycological characteristics of adult patients with tinea capitis in southeastern Korea.METHODS: Using medical records from Kyungpook National University Hospital and Catholic Skin Clinic from 1989 to 2018, we retrospectively investigated the epidemiological and mycological characteristics of 266 adult patients (aged over 20) with tinea capitis.RESULTS: Among total 266 patients, 239 were KOH-positive. The annual incidence of tinea capitis ranged from 3 to 18 between 1989 and 2018. Of the total, 54 (20.30%) were male and 212 (79.70%) were female. Eighty patients (30.08%) were in their seventies, the most commonly affected age group. Of the remaining, 58 (21.80%) were in their sixties, and 41 (15.41%) in eighties. Among all, 77 (28.95%) visited the hospital in summer, 72 (27.07%) in spring, 64 (24.06%) in winter, and 53 (19.92%) in fall. Dermatophytes were cultured from 171 patients. Microsporum canis was the most common dermatophyte (42.48%), while Trichophyton rubrum was the second (15.79%). Of the 266 patients, 186 (69.92%) lived in urban areas and 80 (30.08%) in rural areas.CONCLUSION: The epidemiological and mycological characteristics of adult patients with tinea capitis were different from those of children in terms of annual incidence, sex distribution, and isolated dermatophytes. These results provide useful information for the treatment and prevention of tinea capitis.


Subject(s)
Adult , Arthrodermataceae , Child , Epidemiology , Female , Humans , Incidence , Korea , Male , Medical Records , Microsporum , Public Health , Retrospective Studies , Sex Distribution , Skin , Tinea Capitis , Tinea , Trichophyton
4.
Rev. chil. infectol ; 36(4): 513-517, ago. 2019. tab, graf
Article in Spanish | LILACS | ID: biblio-1042669

ABSTRACT

Resumen Introducción: Las tiñas son infecciones que afectan la piel y anexos. Trichophyton tonsurans es un hongo antropofílico emergente que puede provocar brotes. Objetivo: Describir un brote de tiña por T. tonsurans en una escuela de Valparaíso. Materiales y Método: Estudio descriptivo realizado entre junio-agosto de 2018. Se consideró caso a todo alumno de la escuela y a familiares directos en contacto con ellos, con diagnóstico clínico de tiña. El estudio micológico de las muestras tomadas se realizó a través de pruebas morfo-fisiológicas. Los datos se expresaron en números y porcentajes. Resultados: Hubo 18 casos, 16 niños (15 del kindergarten) y dos adultos. Tasa de ataque en kindergarten fue de 68%. Nueve casos fueron varones con promedio de edad de 6 años. Catorce de nacionalidad chilena y una haitiana. El caso índice fue un niño chileno y el primario el niño haitiano. La localización más frecuente fue en el rostro. Diez casos tuvieron cultivo con desarrollo de T. tonsurans. La mayoría requirió tratamiento con terbinafina por fracaso terapéutico con clotrimazol. Conclusiones: El brote por T. tonsurans ocurrió principalmente en varones del kindergarten. La principal localización fue en el rostro. La mayoría de los casos requirió terbinafina como tratamiento por fracaso terapéutico con clotrimazol.


Background: Ringworm are skin and its annexes infections. Trichophyton tonsurans is an emergent anthropophilic fungus that might cause outbreaks. Aim: To describe a ringworm outbreak by T tonsurans in an elementary school in Valparaíso, Chile. Methods: A descriptive study was run between June and August, 2018. Students and his closest relatives in contact with them who were clinically diagnosed with ringworm have been considered a case. Mycological studies of samples had been carried out through morphophysiology tests. Data are shown in numbers and percentages. Results: There were 18 cases, 16 kids (15 from kindergarten) and 2 adults. Attack rate was 68% in kindergarten. Nine cases were boys with average age of 6 years old. For 14 cases their nationality was Chilean and in 1 case Haitian. First case was a Chilean boy, and primary case was a Haitian boy. The most frequent location was face. Ten cases yielded positive cultures for T tonsurans. Most of the patients needed terbinafine treatment after a therapeutic failure performed with clotrimazole. Conclusion: T. tonsurans outbreak ocurred mainly in kindergarten male. The most frequent location was face. Most of the patients needed terbinafine treatment after a therapeutic failure with clotrimazole.


Subject(s)
Humans , Male , Female , Child, Preschool , Child , Tinea/epidemiology , Trichophyton/isolation & purification , Disease Outbreaks , Tinea/microbiology , Chile/epidemiology
6.
An. bras. dermatol ; 94(3): 293-297, May-June 2019. tab
Article in English | LILACS | ID: biblio-1011097

ABSTRACT

Abstract: Background: Dermatophytosis is a cutaneous disease caused by filamentous keratinophilic fungi belonging to the genera Trichophyton, Microsporum and Epidermophyton, which present a high prevalence in the general population, being among the most common mycoses affecting about 20% of the world's population. Objective: To carry out the epidemiological survey of cases of dermatophytosis in patients from the Sistema Único de Saúde in a regional Laboratory in the period of 5 years (2009 to 2013). Methods: A retrospective study (January 2009 to December 2013) was carried out with a qualitative and quantitative design, through the registry book of the laboratory, Mycology Sector, where cases of patients with suspected dermatomycosis were analyzed. Results: In a 5-year period, a total of 4467 cases were suspected of having a fungal infection. Of these, 68.74% (3071) cases were of dermatomycosis. In relation to cultures with fungal growth, 12.54% (385 cases) were dermatophyte fungi and 7.97% (245 cases) non-dermatophyte fungi were isolated. Among the species identified, there was a higher prevalence of T. rubrum complex (75%), T. mentagrophytes complex (11.68%) and M. canis (7.01%). Regarding the sites analyzed, nail involvement was the most frequent in 75% of the cases. Study Limitations: This work is representative in the studied region. Conclusions: Dermatomycosis samples are the most frequent among all samples of fungal infections from these patients, with the nail being the most affected area and the fungi T. rubrum complex and T. mentagrophytes complex the most frequent.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Young Adult , Tinea/epidemiology , Tinea/microbiology , Trichophyton/isolation & purification , Brazil/epidemiology , Sex Factors , Prevalence , Retrospective Studies , Epidermophyton/isolation & purification , Microsporum/isolation & purification , Nails/microbiology , National Health Programs
7.
Article in Korean | WPRIM | ID: wpr-759714

ABSTRACT

BACKGROUND: Tinea capitis manifests either as a non-inflammatory or inflammatory type including kerion, which may cause permanent alopecia. In addition to antifungals, systemic corticosteroids (prednisolone at 1~2 mg/kg/day) have been used to reduce inflammation in patients with kerion. OBJECTIVE: We studied the clinical and laboratory features, treatments, and prognosis of tinea capitis. METHODS: We performed a retrospective review of 12 cases of kerion and 12 cases of non-inflammatory tinea capitis (median age, 8 years; range, 3 months~80 years) diagnosed using a potassium hydroxide mount at the National Health Insurance Service Ilsan Hospital between November 2011 and April 2018. RESULTS: Fungal cultures showed Microsporum species in 6 cases and Trichophyton species in 1 case. The duration of diseases and extent of lesions were greater in the kerion group than in the non-inflammatory tinea capitis group (p<0.05). Sixteen patients were treated with systemic antifungals. In the kerion group, 10 patients were treated with systemic antifungals (6 with itraconazole [median, 26 days; range, 21~58 days] and 4 with terbinafine [median, 24.5 days; range, 13~31 days]). The median intervals between the onset of treatment and scalp clearing (in 10 cases), the onset of new hair growth (in 9 cases), and complete regrowth of hair (in 7 cases) were 27 (range, 13~77), 33 (range, 19~63), and 89 (range, 42~180) days, respectively, in the kerion group. The median dosage of prednisolone used in patients with kerion was 0.26 mg/kg/day (range, 0.15~0.42) with good clinical response. CONCLUSION: The patients with kerion responded well to antifungal treatments. A lower dose of prednisolone was adequate when systemic corticosteroids were required for the treatment of kerion.


Subject(s)
Adrenal Cortex Hormones , Alopecia , Hair , Humans , Inflammation , Itraconazole , Microsporum , National Health Programs , Potassium , Prednisolone , Prognosis , Retrospective Studies , Scalp , Tinea Capitis , Tinea , Trichophyton
8.
10.
Article in Spanish | LILACS | ID: biblio-1007328

ABSTRACT

Propolis is a substance manufactured by Apis mellifera and has been widely used in folk medicine due to its high concentration of bioactive compounds. The purpose of the following study was to characterize and evaluate in vitro the antimicrobial properties of propolis on clinical samples and ATCC strains. The chemical characterization of propolis presents a concentration of total polyphenols of 247 ± 9 mg EAG g-1 MS, flavones and flavonols 75± 4 mg EQ g-1 MS, flavanonones and flavanonols 118 ± 11 EP g-1 MS. HPLC-DAD identified apigenin, galangin, phenethyl ester of caffeic acid and pinocembrin, in addition to 16 compounds by HPLC MS/MS. Chilean propolis is a natural antimicrobial, showing effectiveness in strains ATCC Staphylococcus aureus, Candida albicans, Trichophyton rubrum and clinical samples of Staphylococcus aureus unlike Escherichia coli. These results demonstrate the antimicrobial effectiveness of the synergy of compounds present in propolis against different human pathogens.


El propóleos es una substancia fabricada por Apis mellifera y ha sido utilizado ampliamente en la medicina popular debido a su alta concentración de compuestos bioactivos. El propósito del siguiente estudio fue caracterizar y evaluar in vitro las propiedades antimicrobianas del propóleos sobre muestras clínicas y cepas ATCC. La caracterización química de propóleos presenta una concentración de polifenoles totales de 247 ± 9 mg EAG g-1 de MS, flavonas y flavonoles 75 ± 4 mg EQ g-1 de MS, flavanononas y flavanonoles 118 ± 11 EP g-1 de MS. Mediante HPLC-DAD se identificó apigenina, galangina, fenetil éster del ácido cafeico y pinocembrina, además de 16 compuestos mediante HPLC MS/MS. El propóleos chileno es un antimicrobiano natural, observándose efectividad en cepas ATCC Staphylococcus aureus, Candida albicans, Trichophyton rubrum y muestras clínicas de Staphylococcus aureus a diferencia de Escherichia coli. Estos resultados demuestran la efectividad antimicrobiana de la sinergia de compuestos presentes en el propóleos ante diferentes patógenos humanos.


Subject(s)
Humans , Propolis/pharmacology , Staphylococcus aureus/drug effects , Candida albicans/drug effects , Escherichia coli/drug effects , Anti-Infective Agents/pharmacology , Pharynx/microbiology , Propolis/chemistry , Trichophyton/drug effects , Flavonoids/analysis , Microbial Sensitivity Tests , Apis mellifica , Chile , Chromatography, High Pressure Liquid , Escherichia coli/drug effects , Gas Chromatography-Mass Spectrometry , Anti-Infective Agents/chemistry , Mouth/microbiology
11.
Rev. bras. anal. clin ; 50(1): 33-37, jun. 2018.
Article in Portuguese | LILACS | ID: biblio-911971

ABSTRACT

Objetivo: As dermatofitoses afetam boa parte da população mundial, sendo possível observar diferentes padrões de distribuição regional em relação aos tipos e frequências de espécies isoladas. No Brasil, estas diferenças nos padrões são observadas em diversas regiões, entretanto poucos dados foram publicados na região Nordeste nos últimos anos, gerando uma lacuna de informação sobre o tema. Este trabalho teve como objetivo atualizar os dados sobre a incidência de dermatofitose na região. Métodos: Foram agrupadas as dermatofitoses confirmadas em pacientes atendidos no Laboratório de Micologia Médica da Universidade Federal de Pernambuco, no período de janeiro de 2014 a junho de 2017, avaliando- se as possíveis mudanças nas espécies prevalentes. Resultados: Foram analisados 2.893 laudos, onde 268 foram positivos para dermatofitoses. O sítio de infecção variou significativamente conforme a faixa etária. Quanto à etiologia, o gênero Trichophyton foi isolado em um total de 252 amostras, o gênero Microsporum em 9 amostras e o gênero Epidermophyton em 7 amostras. Conclusão: Sobre a frequência das espécies, Trichophyton rubrum foi o agente etiológico predominante, semelhante ao já relatado em várias regiões do Brasil e do mundo, bem como em estudos anteriores da região. O dermatófito zoofílico mais comum foi Microsporum canis, corroborando com uma tendência já relatada por alguns autores. Trichophyton mentagrophytes foi isolado com maior frequência em pé e pele glabra, local em que se constitui um dos agentes etiológicos mais importantes. Contudo, foi observado um declínio significativo na sua detecção em todas as localizações, o que corrobora com estudos anteriores realizados na mesma região.


Subject(s)
Tinea , Trichophyton , Epidemiology , Epidermophyton , Microsporum
13.
Rev. chil. infectol ; 35(2): 204-206, abr. 2018. graf
Article in Spanish | LILACS | ID: biblio-959432

ABSTRACT

Resumen Las mascotas exóticas, como el erizo de tierra, son capaces de transmitir al ser humano diferentes infecciones, como salmonelosis, micobacterias, protozoos como Cryptosporidium parvum, y dermatofitosis. Presentamos el caso de un paciente adulto masculino, que recientemente había adquirido un erizo de tierra, que presentó en la mano una lesión de tiña incógnita y un granuloma de Majocchi. Se identificó el agente etiológico como Trichophyton erinacei, por cultivo micológico y biología molecular. El paciente se trató con terbinafina por vía oral, por seis meses, con excelente respuesta.


Exotic pets, such as the ground hedgehog, are capable of transmitting to the human being different zoonoses, such as salmonellosis, mycobacteria, protozoa such as Cryptosporidium parvum, and dermatophytosis. We present the case report of a male adult patient, who had recently acquired a ground hedgehog, who presented in his hand a ringworm lesion incognito and a Majocchi granuloma. The etiological agent was identified as Trichophyton erinacei by mycological culture and molecular biology. The patient was treated with terbinafine oral, with excellent response.


Subject(s)
Humans , Animals , Male , Adult , Tinea/microbiology , Tinea/pathology , Trichophyton/isolation & purification , Granuloma/microbiology , Hedgehogs/microbiology , Tinea/drug therapy , Diagnosis, Differential , Eczema/diagnosis , Terbinafine , Granuloma/drug therapy , Hand/pathology , Mexico , Antifungal Agents/therapeutic use , Naphthalenes/therapeutic use
14.
Rev. chil. infectol ; 35(3): 262-265, 2018. tab, graf
Article in Spanish | LILACS | ID: biblio-959440

ABSTRACT

Resumen Introducción: Las dermatofitosis son infecciones comunes en humanos, provocadas por hongos de los géneros Trichophyton, Microsporum y Epidermophyton. Objetivo: Determinar la frecuencia de E. floccosum en dermatofitos aislados en un laboratorio de la Región de Valparaíso durante las últimas tres décadas. Conocer las localizaciones más frecuentes, los grupos etarios y sexo de los pacientes afectados por este agente. Materiales y Método: Se revisaron los informes de cultivos superficiales con desarrollo de E. floccosum, Microsporum spp y Trichophyton spp de las tres últimas décadas del laboratorio de Micología de la Universidad de Valparaíso. Se registró en una planilla Excel el resultado del cultivo, edad, sexo y ubicación de la lesión de los pacientes. Resultados: El total de dermatofitosis con agente identificado fue de 6.780. En 26 casos hubo desarrollo de E. floccosum, de éstos, 73% (19/26) fueron en hombres y con una edad promedio de 37 años. La frecuencia disminuyó progresivamente desde la década de los ochenta hasta la del 2000. El grupo etario más afectados fue el de 36-60 años. Las localizaciones más frecuentemente afectadas fueron la planta y uñas de los pies. Conclusiones: Existe una disminución progresiva de la frecuencia de aislamiento de E. floccosum en el período estudiado. El sexo masculino y el grupo etario de 36-60 años fueron los más afectados. Las localizaciones más frecuentes fueron la planta y uñas de los pies.


Background: Dermatophytoses are frequent infections in human, which are produced by fungus genera Trichophyton, Microsporum and Epidermophyton. Aim: To determine frequency of E. floccosum in isolated dermatophyte in a laboratory from Valparaíso during the last three decades, in addition to knowing the most frequent localization, age and gender of patients affected by this agent. Method: All superficial culture reports, issued by the Universidad de Valparaíso's mycology laboratory in the last three decades, with E. floccosum, Microsporum spp and Trichophyton spp development, has been reviewed. Patients age, gender, location of the injury and culture report has been registered in an excel spreadsheet. Results: The total number of reports with dermatophyte development in the culture was 6,780. Only 26 cases show E. floccosum development, 73% of this (19/26) were present on men with and average age of 37 years. Frequency did progressively fall since eighty's until 2000 decade. The age group most affected by this etiological agent was 30-36 years. The most frequently localization in both man and woman were foot plant and nails. Conclusions: Frequency of isolation did decrease progressively in dermatophytose by E. floccosum for the study period. Masculine gender and 36-60 age group were the most affected. The most frequently localization were foot plant and nails.


Subject(s)
Humans , Male , Female , Child , Adolescent , Adult , Middle Aged , Young Adult , Tinea/microbiology , Trichophyton/isolation & purification , Epidermophyton/isolation & purification , Microsporum/isolation & purification , Tinea/epidemiology , Chile/epidemiology , Retrospective Studies
15.
Annals of Dermatology ; : 202-210, 2018.
Article in English | WPRIM | ID: wpr-714158

ABSTRACT

BACKGROUND: Bee venom (BV) has been widely investigated for potential medical uses. Recent inadvertent uses of BV based products have shown to mitigate signs of fungal infections. However, the component mediating the antifungal effect has not been identified. OBJECTIVE: This investigation compares bee venom in its whole and partial forms to evaluate the possible component responsible for the antifungal effect. METHODS: Forty-eight plates inoculated with Trichophyton rubrum were allocated into four groups. The groups were treated with raw BV (RBV), melittin, apamin and BV based mist (BBM) respectively and each group was further allocated accordingly to three different concentrations. The areas were measured every other day for 14 days to evaluate the kinetic changes of the colonies. RESULTS: The interactions of ratio differences over interval were confirmed in groups treated with RBV and BBM. In RBV, the level of differences were achieved in groups treated with 10 mg/100 µl (p=0.026) and 40 mg/100 µl (p=0.000). The mean difference of ratio in groups treated with RBV was evident in day 3 and day 5. The groups that were treated with melittin or apamin did not show any significant interaction. In BBM groups, the significant levels of ratio differences over time intervals were achieved in groups treated with 200 µl/100 µl (p=0.000) and 300 µl/100 µl (p=0.030). CONCLUSION: The the bee venom in its whole form delivered a significant level of inhibition and we concluded that the venom in separated forms are not effective. Moreover, BV based products may exert as potential antifungal therapeutics.


Subject(s)
Antifungal Agents , Apamin , Bee Venoms , Bees , Melitten , Negotiating , Trichophyton , Venoms
16.
Electron. j. biotechnol ; 28: 101-112, July. 2017. ilus, graf, tab
Article in English | LILACS | ID: biblio-1015977

ABSTRACT

Background: The hydrolysis of keratin wastes by microorganisms is considered a biotechnological alternative for recycling and valorization through keratinolytic microorganisms. Despite their resistant structure, keratin wastes can be efficiently degraded by various microorganisms through the secretion of keratinases, which are promising enzymes for several applications, including detergents, fertilizers, and leather and textile industry. In an attempt to isolate keratinolytic microorganisms that can reach commercial exploitation as keratinase producers, the current work assesses the dynamics of keratin biodegradation by several keratinolytic fungal strains isolated from soil. The activity of fungal strains to degrade keratin substrates was evaluated by SEM, FTRIR-ATR spectra and TGA analysis. Results: SEM observations offered relevant information on interactions between microorganism and structural elements of hair strands. FTIR spectra of the bands at 1035­1075 cm-1 assigned to sulfoxide bond appeared because of S­S bond breaking, which demonstrated the initiation of keratin biodegradation. According to TGA, in the second zone of thermal denaturation, where keratin degradation occurs, the highest weight loss of 71.10% was obtained for sample incubated with Fusarium sp. 1A. Conclusions: Among the tested strains, Fusarium sp. 1A was the most active organism in the degradation process with the strongest denaturation of polypeptide chains. Because keratinolytic microorganisms and their enzymes keratinases represent a subject of scientific and economic interest because of their capability to hydrolyze keratin, Fusarium sp. 1A was selected for further studies.


Subject(s)
Fungi/enzymology , Fungi/metabolism , Keratins/metabolism , Peptide Hydrolases/metabolism , Thermogravimetry , Trichoderma/metabolism , Trichophyton/metabolism , Biodegradation, Environmental , Microscopy, Electron, Scanning , Cladosporium/metabolism , Spectroscopy, Fourier Transform Infrared , Fusarium/metabolism , Hydrolysis , Keratins/chemistry , Microsporum/metabolism
17.
An. bras. dermatol ; 92(2): 283-284, Mar.-Apr. 2017.
Article in English | LILACS | ID: biblio-1038246

ABSTRACT

Abstract: Tinea capitis is the most common fungal infection in children. The identification of the etiologic agent helps clinicians make their therapeutic choice. Studies conducted in different countries show a changing pattern of the main etiological agents according to their regions. We performed a retrospective study in the tertiary public service in São Paulo, analyzing the isolated etiological agents in patients with tinea capitis from March 2013 to May 2015. Microsporum canis was the main agent (56.6%), followed by Trichophyton tonsurans (36.6%). Despite recent migratory movements in the city, we observed no change in the causative agent of tinea capitis.


Subject(s)
Humans , Male , Female , Child, Preschool , Child , Tinea Capitis/epidemiology , Tinea Capitis/microbiology , Trichophyton/isolation & purification , Urban Population , Brazil/epidemiology , Incidence , Retrospective Studies , Microsporum/isolation & purification
19.
Article in Korean | WPRIM | ID: wpr-136700

ABSTRACT

Dermatophytes usually infect keratinized epithelial structures such as hair and nails. However, they can also cause deep and extensive fungal infections, especially in immunocompromised patients. We report a case with multiple dermal abscesses, which is a rare manifestation of Trichophyton rubrum infection. A 54-year-old man presented with multiple subcutaneous nodules in both inguinal areas with associated tinea cruris. Histopathological findings showed abscesses with fungal hyphae highlighted using Periodic acid-Schiff diastase (PAS-D) staining. Trichophyton rubrum was isolated on a fungal culture of the biopsy specimen obtained from a subcutaneous nodule in the inguinal area. The lesions were resistant to treatment with itraconazole (100 mg twice a day for 6 months); thus, we changed the drug to voriconazole (200 mg twice a day for 3 months). In addition, we extracted the remaining big lesions by incision and drainage. The patient was successfully treated with voriconazole and surgical method.


Subject(s)
Abscess , Amylases , Arthrodermataceae , Biopsy , Drainage , Hair , Humans , Hyphae , Immunocompromised Host , Itraconazole , Methods , Middle Aged , Tinea , Trichophyton , Voriconazole
20.
Article in Korean | WPRIM | ID: wpr-136697

ABSTRACT

Dermatophytes usually infect keratinized epithelial structures such as hair and nails. However, they can also cause deep and extensive fungal infections, especially in immunocompromised patients. We report a case with multiple dermal abscesses, which is a rare manifestation of Trichophyton rubrum infection. A 54-year-old man presented with multiple subcutaneous nodules in both inguinal areas with associated tinea cruris. Histopathological findings showed abscesses with fungal hyphae highlighted using Periodic acid-Schiff diastase (PAS-D) staining. Trichophyton rubrum was isolated on a fungal culture of the biopsy specimen obtained from a subcutaneous nodule in the inguinal area. The lesions were resistant to treatment with itraconazole (100 mg twice a day for 6 months); thus, we changed the drug to voriconazole (200 mg twice a day for 3 months). In addition, we extracted the remaining big lesions by incision and drainage. The patient was successfully treated with voriconazole and surgical method.


Subject(s)
Abscess , Amylases , Arthrodermataceae , Biopsy , Drainage , Hair , Humans , Hyphae , Immunocompromised Host , Itraconazole , Methods , Middle Aged , Tinea , Trichophyton , Voriconazole
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