Insights into Colonization in Cystic Fibrosis and Cross-Transmission between Patients and Hospital Environments.

Background: Approximately 60% of individuals with cystic fibrosis (CF) are affected by infection. This condition is correlated with a decline in lung function and is identified as an independent risk factor contributing to hospital admissions among CF patients. This study investigates the dynamic interplay of within the context of CF patients, tracing its evolution over time, with a specific emphasis on colonization dynamics.

Comparison of galactomannan lateral flow assay and enzyme immunoassay to identify Aspergillus spp. in bronchoalveolar lavage fluid.

Aspergillus species can colonize and infect immunocompetent and immunocompromised hosts. Conventional fungal identification depends on microscopic analysis and microorganism medium growth. Other diagnostic methods, non-growth dependent, to invasive fungal infections, are the biomarkers that detect circulating polysaccharides, for example, 1-3-β-d-Glucan and galactomannan.

A cluster of displaying fluconazole-trailing in a neonatal intensive care unit successfully contained by multiple infection-control interventions.

Objective: This study aimed to investigate and contain a cluster of invasive candidiasis cases caused by fluconazole-resistant (FRC) in a neonatal intensive care unit.

Methods: Active surveillance was initiated. Direct observations of hand-hygiene compliance (HHC) among staff were conducted before and after the implementation of hand-hygiene (HH) education.

Genomic diversity of the pathogenic fungus Aspergillus fumigatus in Japan reveals the complex genomic basis of azole resistance.

Aspergillus fumigatus is a pathogenic fungus with a global distribution. The emergence of azole-resistant A. fumigatus (ARAf) other than the TR-mutants is a problem in Japan.

Uncovering a Novel 51A Mutation and Antifungal Resistance in through Culture Collection Screening.

Background: is an important concern for immunocompromised individuals, often resulting in severe infections. With the emergence of resistance to azoles, which has been the therapeutic choice for infections, monitoring the resistance of these microorganisms becomes important, including the search for mutations in the 51A gene, which is the gene responsible for the mechanism of action of azoles. We conducted a retrospective analysis covering 478 isolates.

efficacy of pitavastatin combined with itraconazole against in silkworm models.

Azole resistance in is a worldwide concern and new antifungal drugs are required to overcome this problem. Statin, a 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitor, has been reported to suppress the growth of , but little is known about its antifungal effect against . In this study, we evaluated the efficacy of pitavastatin (PIT) combined with itraconazole (ITC) against azole-susceptible and azole-resistant strains with silkworm models.

Selection of isolates carrying the G448S substitution in 51A gene after long-term treatment with voriconazole in an immunocompromised patient.

We present a case of a 55-year-old man with a heart transplant who acquired Invasive Aspergillosis by with the focus in the kidney. During about two years of antifungal treatment, most of the time with voriconazole, it was possible to obtain nine isolates of with the same genotypic characteristics, but with an increase in MIC for several azoles. The two last isolates presented high MICs for Voriconazole (>8 μg/mL>).

Genetic differences between Japan and other countries in cyp51A polymorphisms of Aspergillus fumigatus.

Background: Mutations in cyp51A gene are known as main mechanisms of azole resistance in Aspergillus fumigatus, whereas azole-susceptible strains also carry cyp51A mutations (polymorphisms). The polymorphisms found in Europe mainly consist of two combinations of mutations, that is combinations of five single-nucleotide polymorphisms (SNPs) of cyp51A, referred to as cyp51A-5SNPs, and combinations of three SNPs of cyp51A, referred to as cyp51A-3SNPs. Few studies have compared the distributions of cyp51A polymorphisms between different regions.

Development and validation of LAMP primer sets for rapid identification of Aspergillus fumigatus carrying the cyp51A TR azole resistance gene.

Infections due to triazole-resistant Aspergillus fumigatus are increasingly reported worldwide and are associated with treatment failure and mortality. The principal class of azole-resistant isolates is characterized by tandem repeats of 34 bp or 46 bp within the promoter region of the cyp51A gene. Loop-mediated isothermal amplification (LAMP) is a widely used nucleic acid amplification system that is fast and specific.

Hmg1 mutations in Aspergillus fumigatus and their contribution to triazole susceptibility.

Unlabelled: Triazole-resistant Aspergillus fumigatus is a global health concern. In general, each triazole resistance pattern caused by the specified amino acid substitution of Cyp51A has a typical pattern depending on the mutation site. We evaluated the contribution of both Cyp51A and Hmg1 mutations to atypical triazole resistance in A.

Evaluation of Surveyor nuclease for rapid identification of FKS genes mutations in Candida glabrata.

Introduction: Infections with Candida glabrata have recently gained worldwide attention owing to its association with long hospitalizations and high mortality rates. This problem is highlighted when the infection is associated with echinocandin resistance, which is used for first-line therapy. Echinocandin resistance is exclusively attributed to functional mutations in FKS genes, and especially in hot spot (HS) regions.

High detection rate of azole-resistant Aspergillus fumigatus after treatment with azole antifungal drugs among patients with chronic pulmonary aspergillosis in a single hospital setting with low azole resistance.

The prevalence of azole-resistant Aspergillus fumigatus (ARAF) among chronic pulmonary aspergillosis (CPA) patients treated with azoles in Japan is unknown. The aim of this study was to determine the detection rate of ARAF in isolates from CPA patients who were treated with azoles for varying durations. The potential mechanism of acquiring resistance was examined by sequencing cyp51A and hmg1, two genes associated with ARAF.

Genetic Basis of Azole and Echinocandin Resistance in Clinical Candida glabrata in Japan.

Infections caused by have caused worldwide concern, especially when they are associated with increasing echinocandin and azole resistance. In this study, we analyzed the molecular mechanisms of azole and echinocandin resistance in isolates obtained from hospitalized patients in Japan from 1997 to 2019. All isolates were checked phenotypically for resistance and genotypically for mutations in , , hot spot 1 (HS1), HS2, and HS3 of , and HS1 and HS2 of , and all isolates were genotyped by multilocus sequence typing (MLST).

Detection of Substitutions at 98th, 121st, and 289th Amino Acid Residues in Cyp51A using Cycling Probes.

Azole-resistant Aspergillus fumigatus containing unique mutation(s) of cyp51A with tandem repeats in the promoter region has emerged and has become dispersed in environments worldwide. For this study, we designed primers and cycling probes to detect mutations associated with tandem repeats. Substitutions at the 293rd nucleotide (leucine or histidine at the 98th amino acid residue), at the 362nd nucleotide (tyrosine or phenylalanine at the 121st amino acid residue), and at the 865th nucleotide (threonine or alanine at the 289th amino acid residue) in cyp51A were detected using these primers and probes.

A Simple Method To Detect Point Mutations in Aspergillus fumigatus Gene Using a Surveyor Nuclease Assay.

One of the main mechanisms of azole resistance of is thought to be a reduction in the drug's affinity for the target molecule, Cyp51A, due to its amino acid mutation(s). It is known that the azole resistance pattern is closely related to the mutation site(s) of the molecule. In this study, we tried to develop a simple and rapid detection method for mutations using the endonuclease Surveyor nuclease.

Aspergillus fumigatus Clinical Isolates Carrying CYP51A with TR34/L98H/S297T/F495I Substitutions Detected after Four-Year Retrospective Azole Resistance Screening in Brazil.

Azole antifungal resistance in is a worldwide concern. As in most public hospitals in Brazil, antifungal susceptibility tests are not routinely performed for filamentous fungi at our institution. A 4-year retrospective azole antifungal resistance screening revealed two azole-resistant clinical isolates carrying the CYP51A TR34 (34-bp tandem repeat)/L98H (change of L to H at position 98)/S297T/F495I resistance mechanism mutations, obtained from two unrelated patients.

Non-cyp51A Azole-Resistant Aspergillus fumigatus Isolates with Mutation in HMG-CoA Reductase.

The recent increase in azole-resistant Aspergillus fumigatus is a global concern. Identifying the mutations that confer azole resistance is essential for developing novel methods for prompt diagnosis and effective drug treatment. We screened A.

The relationship between the violet pigment PP-V production and intracellular ammonium level in Penicillium purpurogenum.

Penicillium purpurogenum is the fungus that produces an azaphilone pigment. However, details about the pigment biosynthesis pathway are unknown. The violet pigment PP-V is the one of the main pigments biosynthesized by this fungus.

PP-O and PP-V, Monascus pigment homologues, production, and phylogenetic analysis in Penicillium purpurogenum.

The production of pigments as secondary metabolites by microbes is known to vary by species and by physiological conditions within a single strain. The fungus strain Penicillium purpurogenum IAM15392 has been found to produce violet pigment (PP-V) and orange pigment (PP-O),Monascus azaphilone pigment homologues, when grown under specific culture conditions. In this study, we analysed PP-V and PP-O production capability in seven strains of P.

Construction of transformation system in Penicillium purpurogenum.

Penicillium purpurogenum attracts attention in the food industry and biomass degradation. We expressed green fluorescent protein (GFP) with pBPE, a novel vector, and constructed a transformation system for P. purpurogenum.

Importance of the ammonia assimilation by Penicillium purpurogenum in amino derivative Monascus pigment, PP-V, production.

A fungal strain, Penicillium purpurogenum IAM 15392, produced the azaphilone Monascus pigment homolog when cultured in a medium composed of soluble starch, ammonium nitrate, yeast extract, and citrate buffer, pH 5.0. One of the typical features of violet pigment PP-V [(10Z)-12- carboxyl-monascorubramine] is that pyranoid oxygen is replaced with nitrogen.

Effects of inorganic nitrogen sources on the production of PP-V [(10Z)-12-carboxyl-monascorubramine] and the Expression of the nitrate assimilation gene cluster by Penicillium sp. AZ.

A fungal strain, Penicillium sp. AZ, produced the azaphilone Monascus pigment homolog when cultured in a medium composed of soluble starch, ammonium nitrate, yeast extract, and citrate buffer, pH 5.0.