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Invasive fungal infections

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https://www.readbyqxmd.com/read/28720735/a-nonredundant-phosphopantetheinyl-transferase-ppta-is-a-novel-antifungal-target-that-directs-secondary-metabolite-siderophore-and-lysine-biosynthesis-in-aspergillus-fumigatus-and-is-critical-for-pathogenicity
#1
Anna Johns, Daniel H Scharf, Fabio Gsaller, Hella Schmidt, Thorsten Heinekamp, Maria Straßburger, Jason D Oliver, Mike Birch, Nicola Beckmann, Katharine S Dobb, Jane Gilsenan, Bharatkumar Rash, Elaine Bignell, Axel A Brakhage, Michael J Bromley
Secondary metabolites are key mediators of virulence for many pathogens. Aspergillus fumigatus produces a vast array of these bioactive molecules, the biosynthesis of which is catalyzed by nonribosomal peptide synthetases (NRPSs) or polyketide synthases (PKSs). Both NRPSs and PKSs harbor carrier domains that are primed for acceptance of secondary metabolic building blocks by a phosphopantetheinyl transferase (P-pant). The A. fumigatus P-pant PptA has been shown to prime the putative NRPS Pes1 in vitro and has an independent role in lysine biosynthesis; however, its role in global secondary metabolism and its impact on virulence has not been described...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28713338/investigation-of-och1-in-the-virulence-of-candida-parapsilosis-using-a-new-neonatal-mouse-model
#2
Katalin Csonka, Máté Vadovics, Annamária Marton, Csaba Vágvölgyi, Erik Zajta, Adél Tóth, Renáta Tóth, Csaba Vizler, László Tiszlavicz, Héctor M Mora-Montes, Attila Gácser
Candida parapsilosis is an opportunistic human fungal pathogen that poses a serious threat to low birth weight neonates, particularly at intensive care units. In premature infants, the distinct immune responses to Candida infections are not well understood. Although several in vivo models exist to study systemic candidiasis, only a few are available to investigate dissemination in newborns. In addition, the majority of related studies apply intraperitoneal infection rather than intravenous inoculation of murine infants that may be less efficient when studying systemic invasion...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28707783/aggressive-necrotizing-pseudomonal-sinonasal-infections
#3
Edward C Kuan, Bobby A Tajudeen, Kevin C Welch, Rakesh K Chandra, Ben J Glasgow, Jeffrey D Suh
BACKGROUND: Pseudomonas aeruginosa is a gram-negative bacterium frequently implicated in recalcitrant sinonasal infections, especially in immunocompromised hosts. We report 6 cases of rapidly progressive pseudomonal acute rhinosinusitis producing tissue necrosis and, in certain cases, cranial nerve palsies. METHODS: Retrospective review of 6 patients with aggressive necrotizing sinonasal infections treated at 4 tertiary academic medical centers with sinonasal cultures growing P...
July 14, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28705753/invasive-fungal-infections-secondary-to-traumatic-injury
#4
REVIEW
Ryan Kronen, Stephen Y Liang, Grant Bochicchio, Kelly Bochicchio, William G Powderly, Andrej Spec
Invasive fungal infection (IFI) is a rare but serious complication of traumatic injury. The purpose of this article is to review the epidemiology, natural history, mycology, risk factors, diagnosis, treatment, and outcomes associated with post-traumatic IFI in military and civilian populations. The epidemiology of post-traumatic IFI is poorly characterized, but incidence appears to be rising. Patients often suffer from severe injuries and require extensive medical interventions. Fungi belonging to the order Mucorales are responsible for most post-traumatic IFI in both civilian and military populations...
July 10, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28705685/-fungal-sinusitis
#5
REVIEW
E Lafont, C Aguilar, P Vironneau, R Kania, A Alanio, S Poirée, O Lortholary, F Lanternier
Although sinusitis affects about 20 % of the population, fungal sinusitis is rare. Aspergillus sp. are most frequently implicated. Fungal sinusitis represents a wide spectrum of disorders, including acute or chronic and invasive or non-invasive forms. Invasive fungal sinusitis may develop in an immunocompromised or diabetic patient, whereas non-invasive fungal sinusitis should be considered in a chronic situation, resistant to antibiotics in immunocompetent patients. Allergic fungal sinusitis is related to hypersensitivity of the host to the fungus...
July 10, 2017: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/28704463/a-novel-non-invasive-diagnostic-sampling-technique-for-cutaneous-leishmaniasis
#6
Yasaman Taslimi, Pardis Sadeghipour, Sima Habibzadeh, Vahid Mashayekhi, Hossien Mortazavi, Ingrid Müller, Majella E Lane, Pascale Kropf, Sima Rafati
Accurate diagnosis of cutaneous leishmaniasis (CL) is important for chemotherapy and epidemiological studies. Common approaches for Leishmania detection involve the invasive collection of specimens for direct identification of amastigotes by microscopy and the culturing of promastigotes from infected tissues. Although these techniques are highly specific, they require highly skilled health workers and have the inherent risks of all invasive procedures, such as pain and risk of bacterial and fungal super-infection...
July 13, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28702763/pharmacokinetics-of-antifungal-drugs-practical-implications-for-optimized-treatment-of-patients
#7
REVIEW
Romuald Bellmann, Piotr Smuszkiewicz
INTRODUCTION: Because of the high mortality of invasive fungal infections (IFIs), appropriate exposure to antifungals appears to be crucial for therapeutic efficacy and safety. MATERIALS AND METHODS: This review summarises published pharmacokinetic data on systemically administered antifungals focusing on co-morbidities, target-site penetration, and combination antifungal therapy. CONCLUSIONS AND DISCUSSION: Amphotericin B is eliminated unchanged via urine and faeces...
July 12, 2017: Infection
https://www.readbyqxmd.com/read/28702025/cellular-and-molecular-defects-underlying-invasive-fungal-infections-revelations-from-endemic-mycoses
#8
REVIEW
Pamela P Lee, Yu-Lung Lau
The global burden of fungal diseases has been increasing, as a result of the expanding number of susceptible individuals including people living with human immunodeficiency virus (HIV), hematopoietic stem cell or organ transplant recipients, patients with malignancies or immunological conditions receiving immunosuppressive treatment, premature neonates, and the elderly. Opportunistic fungal pathogens such as Aspergillus, Candida, Cryptococcus, Rhizopus, and Pneumocystis jiroveci are distributed worldwide and constitute the majority of invasive fungal infections (IFIs)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28700646/efficacy-and-safety-of-micafungin-versus-extensive-azoles-in-the-prevention-and-treatment-of-invasive-fungal-infections-for-neutropenia-patients-with-hematological-malignancies-a-meta-analysis-of-randomized-controlled-trials
#9
Cho-Hao Lee, Jung-Chung Lin, Ching-Liang Ho, Min Sun, Wel-Ting Yen, Chin Lin
BACKGROUND: Current studies that compare the efficacy and safety of micafungin (MCFG) with that of triazoles for the prophylaxis and treatment of invasive fungal infections (IFIs) demonstrate a lack of sufficient evidence and yield conflicting results. To compare the efficacy and safety of MCFG and triazoles in the prevention and treatment of IFIs, we conducted a meta-analysis and trial sequential analysis (TSA). METHODS: For the meta-analysis, we systematically searched the databases of PubMed, Embase and Cochrane Central Register of Controlled Trials and relevant database articles for randomized controlled studies published through November 2016...
2017: PloS One
https://www.readbyqxmd.com/read/28698667/phylogenetic-analysis-reveals-two-genotypes-of-the-emerging-fungus-mucor-indicus-an-opportunistic-human-pathogen-in-immunocompromised-patients
#10
Saad J Taj-Aldeen, Muna Almaslamani, Bart Theelen, Teun Boekhout
Mucormycosis is a rare fungal infection caused by Mucor indicus. Phylogenetic analysis of many M. indicus isolates, mainly sampled from different clinical and environmental specimens collected worldwide, revealed two genotypes, I and II, based on ITS and D1/D2 LSU rDNA sequences. A retrospective review of the literature revealed 13 cases. Eight (76.9%) patients had disseminated infections, and the overall mortality rate was 30.7%. A pulmonary infection caused by M. indicus genotype I in a liver transplant recipient was disseminated to include the skin and was successfully treated with liposomal amphotericin B and aggressive surgery...
July 12, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28694566/antifungal-resistance-metabolic-routes-as-drug-targets-and-new-antifungal-agents-an-overview-about-endemic-dimorphic-fungi
#11
REVIEW
Juliana Alves Parente-Rocha, Alexandre Melo Bailão, André Correa Amaral, Carlos Pelleschi Taborda, Juliano Domiraci Paccez, Clayton Luiz Borges, Maristela Pereira
Diseases caused by fungi can occur in healthy people, but immunocompromised patients are the major risk group for invasive fungal infections. Cases of fungal resistance and the difficulty of treatment make fungal infections a public health problem. This review explores mechanisms used by fungi to promote fungal resistance, such as the mutation or overexpression of drug targets, efflux and degradation systems, and pleiotropic drug responses. Alternative novel drug targets have been investigated; these include metabolic routes used by fungi during infection, such as trehalose and amino acid metabolism and mitochondrial proteins...
2017: Mediators of Inflammation
https://www.readbyqxmd.com/read/28694233/comparing-the-safety-and-efficacy-of-voriconazole-versus-posaconazole-in-the-prevention-of-invasive-fungal-infections-in-high-risk-patients-with-hematological-malignancies
#12
Ray Hachem, Andrew Assaf, Yazan Numan, Pankil Shah, Ying Jiang, Anne-Marie Chaftari, Issam I Raad
Invasive fungal infection (IFI) is a leading cause of morbidity and mortality in immunocompromised cancer patients. New triazole-based antifungal agents have been recommended for IFI prophylaxis in these patients. This retrospective study compared the safety and efficacy of voriconazole and posaconazole as prophylaxis in patients with hematological malignancies (HM), who were admitted to The University of Texas MD Anderson Cancer Center between January 2014 and August 2015, and who were started on single antifungal prophylaxis consisting of either voriconazole or posaconazole...
July 7, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28694096/a-role-for-random-humidity-dependent-epiphytic-growth-prior-to-invasion-of-wheat-by-zymoseptoria-tritici
#13
Helen N Fones, Chris J Eyles, William Kay, Josh Cowper, Sarah J Gurr
Zymoseptoria tritici causes Septoria leaf blotch of wheat. The prevailing paradigm of the Z. tritici-wheat interaction assumes fungal ingress through stomata within 24-48h, followed by days of symptomless infection. This is extrapolated from studies testing the mode of fungal ingress under optimal infection conditions. Here, we explicitly assess the timing of entry, using GFP-tagged Z. tritici. We show that early entry is comparatively rare, and extended epiphytic growth possible. We test the hypotheses that our data diverge from earlier studies due to: i...
July 8, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/28689871/cd101-a-long-acting-echinocandin-and-comparator-antifungal-agents-tested-against-a-global-collection-of-invasive-fungal-isolates-in-the-sentry-2015-antifungal-surveillance-program
#14
Michael A Pfaller, Shawn A Messer, Paul R Rhomberg, Mariana Castanheira
CD101 is a novel echinocandin with exceptional chemical stability and long-acting pharmacokinetics. The activity of CD101 and comparators was evaluated using CLSI broth microdilution methods against 713 invasive fungal isolates, including 589 Candida spp. (6 species), 14 C. neoformans, 97 A. fumigatus and 13 A. flavus species complex collected worldwide during 2015. All C. tropicalis, C. krusei and C. dubliniensis, 99.7% of C. albicans and 98.3% of C. glabrata were inhibited by ≤0.12 µg/mL of CD101, and these isolates were susceptible/wild type to other echinocandins using CLSI clinical breakpoint and epidemiological cutoff value (ECV) interpretive criteria...
July 6, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28688551/pediatric-invasive-fungal-rhinosinusitis-an-investigation-of-17-patients
#15
Daniel Vinh, Michael Yim, Ankhi Dutta, John K Jones, Wei Zhang, Matthew Sitton
PURPOSE: To investigate outcomes of pediatric patients at a single institution with invasive fungal rhinosinusitis (IFRS) and to determine variables that impact overall survival. METHODS: All pediatric patients at a large tertiary children's hospital diagnosed with IFRS confirmed by surgical pathology from 2009 to 2015 were retrospectively reviewed. Demographics, underlying diseases, symptoms, antifungal therapy, absolute neutrophil count (ANC), surgical management,and outcomes were analyzed...
August 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28687215/invasive-fungal-infections-in-the-intensive-care-unit
#16
REVIEW
Luis Ostrosky-Zeichner, Mohanad Al-Obaidi
Intensive care unit (ICU) patients are exposed to multiple stressors that predispose them to invasive fungal infections (IFIs), which carry high morbidity and mortality. Getting acquainted with the diagnostic methods and therapies is imperative for patient safety and for providing high-quality health care. This article focuses on the most frequent IFIs: invasive candidiasis and invasive aspergillosis.
July 5, 2017: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/28685597/invasive-fungal-infections-managing-the-continuum-of-risk-in-hct-patients
#17
Rafael F Duarte, Sue Lyon
43rd Annual Meeting of the EBMT, 26-29 March 2017, Marseille, France The European Society for Blood and Marrow Transplantation (EBMT) was established in 1974 to enable scientists and physicians to share their experience and develop studies in clinical bone marrow transplantation. Despite advances in treatment, invasive fungal infections (IFI), especially those caused by moulds such as Aspergillus, remain a leading cause of morbidity and mortality in patients with hematological malignancies. There is a continuum of risk of IFI during induction and consolidation therapy, and after hematopoietic cell transplantation...
July 7, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28681812/evaluation-of-serum-galactomannan-enzyme-immunoassay-at-two-different-cut-offs-for-the-diagnosis-of-invasive-aspergillosis-in-patients-with-febrile-neutropenia
#18
Ritin Mohindra, Malini R Capoor, Shikha Puri, Hitesh Raheja, Dinesh K Gupta, B Gupta, Ranadip Chowdhury
BACKGROUND: Invasive aspergillosis (IA) is an increasingly common and fatal opportunistic fungal infection in patients with haematological diseases. Early diagnosis is difficult as mycological culture techniques have low sensitivity and the radiological tools have low specificity. Galactomannan enzyme immunoassay (GEI) detects galactomannan in the human serum with a reported sensitivity and specificity between 30% and 100%. AIMS: The aim of this study was to analyse the role of GEI in diagnosis of IA in patients with febrile neutropenia and to evaluate the role of GEI in the diagnosis of IA as per the revised (2008) European Organization for Research and Treatment of Cancer-Mycoses Study Group (EORTC-MSG) criteria at two different optical density (OD) cut-offs of 0...
April 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28681028/osteomyelitis-and-lung-abscess-due-to-aspergillus-fumigatus-in-a-chronic-granulomatous-disease-patient
#19
S Mamishi, K Zomorodian, F Saadat, S Z Jalali, M Geramishoar
BACKGROUND AND PURPOSE: Chronic granulomatous disease (CGD) is an inherited disorder of the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase complex. This disorder results in recurrent life-threatening bacterial and fungal infections. Aspergillus species are the most common fungal infections in these patients. CASE REPORT: Herein, we present a case of fungal infection in a girl with CGD. We confirmed aspergillosis through the positive microscopic and macroscopic examinations, as well as radiology results...
September 2016: Advances in Medical Mycology (Iran)
https://www.readbyqxmd.com/read/28680526/lateral-flow-assays-for-the-diagnosis-of-invasive-aspergillosis-current-status
#20
REVIEW
Sven Heldt, Martin Hoenigl
PURPOSE OF REVIEW: Diagnosis during early stages of invasive aspergillosis (IA) and targeted antifungal treatment has the potential to improve survival significantly. Despite advances in the diagnostic arsenal, invasive mold infections remain difficult to diagnose-especially at early stages before typical radiological signs develop. Varying availability and time-to-results are important limitations of current approved biomarkers and molecular assays for diagnosis of IA. Here, we will give an update on the Aspergillus-specific lateral-flow device (LFD) test...
2017: Current Fungal Infection Reports
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