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https://www.readbyqxmd.com/read/28300442/an-atypical-case-of-mucocutaneous-blastomycosis-in-the-greater-toronto-area
#1
Annie Liu, Neil Shear, John Wong, Hagen B E Klieb
Blastomycosis is an uncommon infection caused by Blastomyces dermatitidis. While management is fairly straightforward, diagnosis can be quite challenging. We describe a case of a healthy 37-year-old man who presented with progressive mucocutaneous lesions, without lung or other systemic involvement. Treatment with itraconazole resulted in complete resolution of signs and symptoms. This case showcases the variety of blastomycosis clinical presentation and the importance of blastomycosis in the differential diagnosis of verrucous and papillomatous mucocutaneous lesions...
January 1, 2017: Journal of Cutaneous Medicine and Surgery
https://www.readbyqxmd.com/read/28240390/a-novel-dimorphic-pathogen-emergomyces-orientalis-onygenales-agent-of-disseminated-infection
#2
Peng Wang, Chris Kenyon, Sybren de Hoog, Lina Guo, Hongwei Fan, Hongrui Liu, Zhongwei Li, Ruiyuan Sheng, Ying Yang, Yanping Jiang, Li Zhang, Yingchun Xu
A novel dimorphic fungus, Emergomyces orientalis sp. nov. a close relative of systemic pathogens in the family Ajellomycetaceae (Blastomyces, Histoplasma). The fungus is reported in a 64-year-old male from Shanxi, China. The patient developed disseminated skin lesions, productive cough with fever and showed nodular opacities in his left lung on chest radiography. The patient had no identified cause of immunodeficiency apart from type-2 diabetes mellitus. Clinical, histopathological and mycological characteristics of the agent are given, and its phylogenetic position is determined with multilocus sequence data...
February 27, 2017: Mycoses
https://www.readbyqxmd.com/read/28176377/novel-taxa-of-thermally-dimorphic-systemic-pathogens-in-the-ajellomycetaceae-onygenales
#3
Karolina Dukik, Jose F Muñoz, Yanping Jiang, Peiying Feng, Lynne Sigler, J Benjamin Stielow, Joanna Freeke, Azadeh Jamalian, Bert Gerrits van den Ende, Juan G McEwen, Oliver K Clay, Ilan S Schwartz, Nelesh P Govender, Tsidiso G Maphanga, Christina A Cuomo, Leandro F Moreno, Chris Kenyon, Andrew M Borman, Sybren de Hoog
Recent discoveries of novel systemic fungal pathogens with thermally dimorphic yeast-like phases have challenged the current taxonomy of the Ajellomycetaceae, a family currently comprising the genera Blastomyces, Emmonsia, Emmonsiellopsis, Helicocarpus, Histoplasma, Lacazia and Paracoccidioides. Our morphological, phylogenetic and phylogenomic analyses demonstrated species relationships and their specific phenotypes, clarified generic boundaries and provided the first annotated genome assemblies to support the description of two new species...
February 7, 2017: Mycoses
https://www.readbyqxmd.com/read/28116230/cutaneous-blastomycosis-and-dermatophytic-pseudomycetoma-in-a-persian-cat-from-bangkok-thailand
#4
Lerpen Duangkaew, Lawan Larsuprom, Chaiyan Kasondorkbua, Charles Chen, Ariya Chindamporn
This is a case report of concurrent of blastomycosis and pseudomycetoma in a 3 year-old Persian cat from Bangkok, Thailand. Histopathology from antemortem and postmortem samples revealed blastomycosis and dermatophyte pseudomycetoma. The PCR analysis of the formalin-embedded tissue of antemortem sample confirmed that blastomycosis was caused by Blastomyces dermatitidis. Dermatophyte infection was caused by Microsporum canis. According to the author's knowledge, this is the first case of Blastomyces dermatitidis and dermatophyte pseudomycetoma in South-East Asia...
March 2017: Medical Mycology Case Reports
https://www.readbyqxmd.com/read/28093309/paracoccidioides-spp-catalases-and-their-role-in-antioxidant-defense-against-host-defense-responses
#5
Diana Tamayo, José F Muñoz, Agostinho J Almeida, Juan D Puerta, Ángela Restrepo, Christina A Cuomo, Juan G McEwen, Orville Hernández
Dimorphic human pathogenic fungi interact with host effector cells resisting their microbicidal mechanisms. Yeast cells are able of surviving within the tough environment of the phagolysosome by expressing an antioxidant defense system that provides protection against host-derived reactive oxygen species (ROS). This includes the production of catalases (CATs). Here we identified and analyzed the role of CAT isoforms in Paracoccidioides, the etiological agent of paracoccidioidomycosis. Firstly, we found that one of these isoforms was absent in the closely related dimorphic pathogen Coccidioides and dermatophytes, but all of them were conserved in Paracoccidioides, Histoplasma and Blastomyces species...
January 16, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28033237/central-nervous-system-blastomycosis-in-children-a-case-report-and-review-of-the-literature
#6
Theresa Madigan, Yasaman Fatemi, Elitza S Theel, Amaran Moodley, Thomas G Boyce
We present a 7-year-old boy with chronic meningitis caused by Blastomyces dermatitidis. A review of the literature revealed 32 cases of CNS blastomycosis in children between 1983 and 2016, of which 18 represented parenchymal disease of the brain or spinal cord. Blastomycosis affecting the CNS is rare, but should be considered in children with chronic meningitis.
December 28, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27936170/correction-phylogenetic-analysis-reveals-a-cryptic-species-blastomyces-gilchristii-sp-nov-within-the-human-pathogenic-fungus-blastomyces-dermatitidis
#7
Elizabeth M Brown, Lisa R McTaggart, Sean X Zhang, Donald E Low, David A Stevens, Susan E Richardson
[This corrects the article DOI: 10.1371/journal.pone.0059237.].
2016: PloS One
https://www.readbyqxmd.com/read/27927829/lesson-of-the-month-1-lobar-pulmonary-consolidation-in-an-immunocompromised-host
#8
Daniel J Reynolds, Carl A Andersen, Sumedh S Hoskote, Hee Eun Lee, Aditya Raghunathan, Sanjay Kalra, Andrew H Limper
A 19-year-old male with a history of idiopathic panuveitis, currently taking methotrexate and infliximab, presented to our institution with 6 weeks of cough, dyspnoea and fevers. He had failed outpatient antimicrobial therapy. Computerised tomography (CT) of the chest revealed the presence of a lobar pneumonia and he was treated with broad spectrum antibiotics, which did not improve his symptoms. Bronchoalveolar lavage was performed with a transbronchial lung biopsy because of the diagnostic uncertainty of the patient's presentation...
December 2016: Clinical Medicine: Journal of the Royal College of Physicians of London
https://www.readbyqxmd.com/read/27872062/fludioxonil-induces-drk1-a-fungal-group-iii-hybrid-histidine-kinase-to-dephosphorylate-its-downstream-target-ypd1
#9
Stephanie M Lawry, Brad Tebbets, Iain Kean, Douglas Stewart, Joel Hetelle, Bruce S Klein
Novel antifungal drugs and targets are urgently needed. Group III hybrid histidine kinases (HHKs) represent an appealing new therapeutic drug target because they are widely expressed in fungi but absent from humans. We investigated the mode of action of the widely utilized, effective fungicide fludioxonil. The drug acts in an HHK-dependent manner by constitutive activation of the HOG (high-osmolarity glycerol) pathway, but its mechanism of action is poorly understood. Here, we report a new mode of drug action that entails conversion of the HHK from a kinase into a phosphatase...
February 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27744308/ast-to-alt-ratio-is-elevated-in-disseminated-histoplasmosis-as-compared-to-localized-pulmonary-disease-and-other-endemic-mycoses
#10
Andrej Spec, Christopher R Barrios, Usama Ahmad, Laurie A Proia
Severe pulmonary or disseminated histoplasmosis often necessitates presumptive antifungal treatment while awaiting definitive diagnosis. Histoplasma antigen assays have improved sensitivity but results may lag up to 7 days. In order to increase diagnostic certainty, "soft clues" may be looked for in laboratory and radiologic data, such as elevated alkaline phosphatase or ferritin levels and findings of mediastinal adenopathy or hepatosplenomegaly. To determine if elevated aspartate aminotransferase (AST) to alanine aminotransferase (ALT) ratio is specific to histoplasmosis or a non-specific marker for disseminated fungal infection or sepsis in general, we retrospectively examined records of all patients diagnosed with an endemic fungal infection (EFI) at Rush University Medical Center from January of 1997 to October of 2012, and a cohort of septic patients with elevated liver enzymes...
October 14, 2016: Medical Mycology: Official Publication of the International Society for Human and Animal Mycology
https://www.readbyqxmd.com/read/27699146/evidence-of-delayed-dissemination-or-re-infection-with-blastomyces-in-two-immunocompetent-hosts
#11
Jennifer L Anderson, Jennifer K Meece, Matthew C Hall, Holly M Frost
Relapse or recurrence of blastomycosis in patients is rare. Re-infection of a patient with blastomycosis has not been previously reported. In this report, we describe relapse or reinfection with Blastomyces in 2 immunocompetent patients. This is the first study in which genetic typing was performed on paired Blastomyces isolates from the same patient obtained months apart.
September 2016: Medical Mycology Case Reports
https://www.readbyqxmd.com/read/27691971/systemic-blastomycosis-in-a-captive-red-ruffed-lemur-varecia-rubra
#12
Michael F Rosser, Dana M Lindemann, Anne M Barger, Matthew C Allender, Shih-Hsuan Hsiao, Mark E Howes
A 5-yr-old, intact male red ruffed lemur ( Varecia rubra ) presented for evaluation as the result of a 1-wk history of lethargy and hyporexia. Physical examination findings included thin body condition, muffled heart sounds, harsh lung sounds, and liquid brown diarrhea. Complete blood count and serum biochemistry showed an inflammatory leukogram, mild hyponatremia, and mild hypochloremia. Orthogonal trunk radiographs revealed a severe alveolar pattern in the right cranial lung lobes with cardiac silhouette effacement...
September 2016: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
https://www.readbyqxmd.com/read/27663837/development-and-validation-of-a-novel-single-nucleotide-polymorphism-snp-panel-for-genetic-analysis-of-blastomyces-spp-and-association-analysis
#13
Holly M Frost, Jennifer L Anderson, Lynn Ivacic, Brian L Sloss, John Embil, Jennifer K Meece
BACKGROUND: Single nucleotide polymorphism (SNP) genotyping is increasingly being utilized for molecular typing of pathogens and is cost-effective, especially for large numbers of isolates. The goals of this study were 1) to develop and validate a SNP assay panel for genetic analysis of Blastomyces spp., 2) ascertain whether microsatellite genotyping and the SNP genotyping with the developed panel resolve identical genetic groups, and 3) explore the utility of SNPs for examining phylogenetic and virulence questions in humans...
2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27646561/antifungal-therapeutics-for-dimorphic-fungal-pathogens
#14
Kristie D Goughenour, Chad A Rappleye
Dimorphic fungi cause several endemic mycoses which range from subclinical respiratory infections to life-threatening systemic disease. Pathogenic-phase cells of Histoplasma, Blastomyces, Paracoccidioides and Coccidioides escape elimination by the innate immune response with control ultimately requiring activation of cell-mediated immunity. Clinical management of disease relies primarily on antifungal compounds; however, dimorphic fungal pathogens create a number of challenges for antifungal drug therapy. In addition to the drug toxicity issues known for current antifungals, barriers to efficient drug treatment of dimorphic fungal infections include natural resistance to the echinocandins, residence of fungal cells within immune cells, the requirement for systemic delivery of drugs, prolonged treatment times, potential for latent infections, and lack of optimized standardized methodology for in vitro testing of drug susceptibilities...
September 19, 2016: Virulence
https://www.readbyqxmd.com/read/27645246/the-celecoxib-derivative-ar-12-has-broad-spectrum-antifungal-activity-in-vitro-and-improves-the-activity-of-fluconazole-in-a-murine-model-of-cryptococcosis
#15
Kristy Koselny, Julianne Green, Louis DiDone, Justin P Halterman, Annette W Fothergill, Nathan P Wiederhold, Thomas F Patterson, Melanie T Cushion, Chad Rappelye, Melanie Wellington, Damian J Krysan
Only one new class of antifungal drugs has been introduced into clinical practice in the last 30 years, and thus the identification of small molecules with novel mechanisms of action is an important goal of current anti-infective research. Here, we describe the characterization of the spectrum of in vitro activity and in vivo activity of AR-12, a celecoxib derivative which has been tested in a phase I clinical trial as an anticancer agent. AR-12 inhibits fungal acetyl coenzyme A (acetyl-CoA) synthetase in vitro and is fungicidal at concentrations similar to those achieved in human plasma...
December 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27551850/blastomycosis-of-the-nose-a-case-report
#16
Thomas M Jetmore, Jennifer Phan, Abideen O Yekinni
Blastomyces dermatitidis is a thermally dimorphic fungus endemic to the North American soil near the Mississippi, Ohio, and St. Lawrence river valleys, as well as the Great Lakes Basin. It is responsible for blastomycosis, a systemic pyogranulomatous disease. Blastomycosis of the head and neck is decidedly uncommon and often mistaken for cancer. There are only 3 previous case reports of blastomycosis presenting as an intranasal lesion. We report the unusual case of a 24-year-old man with blastomycosis presenting with a 4-week history of a progressively enlarging intranasal mass who had complete resolution of symptoms after treatment with itraconazole and surgical excision of the lesion...
August 2016: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/27525893/effect-of-karst-rocky-desertification-on-soil-fungal-communities-in-southwest-china
#17
P C Wang, B T Mo, Y Chen, Q F Zeng, L B Wang
Karst mountainous ecosystems are associated with karst rocky desertification (KRD), which can greatly impact soil structure and function. Despite the importance of soil microbes as a major factor maintaining ecosystem stability, we know little about the effect on soil fungal communities of KRD in karst regions. We investigated this relationship across a gradient of KRD soils from Guizhou, China by polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE). Fungal diversity indices (Shannon-Wiener, richness, and evenness) significantly differed (P < 0...
July 29, 2016: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/27503156/usefulness-of-lymphoid-granulomatous-inflammation-culture-obtained-by-endobronchial-ultrasound-guided-transbronchial-needle-aspiration-in-a-fungal-endemic-area
#18
John Berger, Felix Zamora, Eitan Podgaetz, Rafael Andrade, H Erhan Dincer
BACKGROUND AND OBJECTIVES: Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is the procedure of choice for the evaluation of mediastinal/hilar lymph node enlargements. Granulomatous inflammation of the mediastinal/hilar lymph nodes is often identified on routine histology. In addition, mediastinal lymphadenopathy may be present with undiagnosed infection. We sought to determine the usefulness of routine cultures and histology for infectious etiologies in a fungal endemic area when granulomatous inflammation is identified...
July 2016: Endoscopic Ultrasound
https://www.readbyqxmd.com/read/27428521/phylogeographic-analysis-of-blastomyces-dermatitidis-and-blastomyces-gilchristii-reveals-an-association-with-north-american-freshwater-drainage-basins
#19
Lisa R McTaggart, Elizabeth M Brown, Susan E Richardson
Blastomyces dermatitidis and Blastomyces gilchristii are dimorphic fungal pathogens that cause serious pulmonary and systemic infections in humans. Although their natural habitat is in the environment, little is known about their specific ecologic niche(s). Here, we analyzed 25 microsatellite loci from 169 strains collected from various regions throughout their known endemic range in North America, representing the largest and most geographically diverse collection of isolates studied to date. Genetic analysis of multilocus microsatellite data divided the strains into four populations of B...
2016: PloS One
https://www.readbyqxmd.com/read/27314650/red-fox-as-sentinel-for-blastomyces-dermatitidis-ontario-canada
#20
Nicole M Nemeth, G Douglas Campbell, Paul T Oesterle, Lenny Shirose, Beverly McEwen, Claire M Jardine
Blastomyces dermatitidis, a fungus that can cause fatal infection in humans and other mammals, is not readily recoverable from soil, its environmental reservoir. Because of the red fox's widespread distribution, susceptibility to B. dermatitidis, close association with soil, and well-defined home ranges, this animal has potential utility as a sentinel for this fungus.
July 2016: Emerging Infectious Diseases
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