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Chong GM, van der Beek MT, von dem Borne PA, Boelens J, Steel E, Kampinga GA, Span LFR, Lagrou K, Maertens JA, Dingemans GJH, Gaajetaan GR, van Tegelen DWE, Cornelissen JJ, Vonk AG, Rijnders BJA. PCR-based detection of Aspergillus fumigatus Cyp51A mutations on bronchoalveolar lavage: a multicentre validation of the AsperGenius assay® in 201 patients with haematological disease suspected for invasive aspergillosis. J Antimicrob Chemother 2016; 71:3528-3535. [PMID: 27530755 DOI: 10.1093/jac/dkw323] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 06/06/2016] [Accepted: 07/08/2016] [Indexed: 01/30/2023] Open
Abstract
OBJECTIVES In patients with invasive aspergillosis (IA), fungal cultures are mostly negative. Consequently, azole resistance often remains undetected. The AsperGenius® multiplex real-time PCR assay identifies clinically relevant Aspergillus species and four resistance-associated mutations (RAMs; TR34/L98H/T289A/Y121F) in the Cyp51A gene. This multicentre study evaluated the diagnostic performance of this assay on bronchoalveolar lavage (BAL) fluid and correlated the presence of RAMs with azole treatment failure and mortality. METHODS Stored BAL samples from patients with haematological diseases with suspected IA were used. BAL samples that were galactomannan/culture positive were considered positive controls for the presence of Aspergillus. Azole treatment failure and 6 week mortality were compared in patients with and without RAMs that had received ≥5 days of voriconazole monotherapy. RESULTS Two hundred and one patients each contributed one BAL sample, of which 88 were positive controls and 113 were negative controls. The optimal cycle threshold cut-off value for the Aspergillus species PCR was <38. With this cut-off, the PCR was positive in 74/88 positive controls. The sensitivity, specificity, positive predictive value and negative predictive value were 84%, 80%, 76% and 87%, respectively. 32/74 BAL samples were culture negative. Azole treatment failure was observed in 6/8 patients with a RAM compared with 12/45 patients without RAMs (P = 0.01). Six week mortality was 2.7 times higher in patients with RAMs (50.0% versus 18.6%; P = 0.07). CONCLUSIONS The AsperGenius® assay had a good diagnostic performance on BAL and differentiated WT from Aspergillus fumigatus with RAMs, including in culture-negative BAL samples. Most importantly, detection of RAMs was associated with azole treatment failure.
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Affiliation(s)
- G M Chong
- Department of Internal Medicine, Section of Infectious Diseases, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - M T van der Beek
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands
| | - P A von dem Borne
- Department of Haematology, Leiden University Medical Center, Leiden, The Netherlands
| | - J Boelens
- Department of Microbiology, Ghent University Hospital, Ghent, Belgium
| | - E Steel
- Department of Haematology, Ghent University Hospital, Ghent, Belgium
| | - G A Kampinga
- Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - L F R Span
- Department of Haematology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - K Lagrou
- Department of Microbiology and Immunology, KU Leuven-University of Leuven; University Hospitals Leuven, Leuven, Belgium
| | - J A Maertens
- Department of Microbiology and Immunology, KU Leuven-University of Leuven; Department of Haematology, University Hospitals Leuven, Leuven, Belgium
| | | | | | | | - J J Cornelissen
- Department of Haematology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A G Vonk
- Department of Medical Microbiology, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - B J A Rijnders
- Department of Internal Medicine, Section of Infectious Diseases, Erasmus University Medical Center, Rotterdam, The Netherlands
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52
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Barnes RA, White PL. PCR Technology for Detection of Invasive Aspergillosis. J Fungi (Basel) 2016; 2:jof2030023. [PMID: 29376940 PMCID: PMC5753136 DOI: 10.3390/jof2030023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 07/20/2016] [Accepted: 07/26/2016] [Indexed: 11/16/2022] Open
Abstract
The application of molecular technologies to aid diagnosis and management of infectious diseases has had a major impact and many assays are in routine use. Diagnosis of aspergillosis has lagged behind. Lack of standardization and limited commercial interest have meant that PCR was not included in consensus diagnostic criteria for invasive fungal disease. In the last ten years careful evaluation and validation by the Aspergillus European PCR initiative with the development of standardized extraction, amplification and detection protocols for various specimen types, has provided the opportunity for clinical utility to be investigated. PCR has the potential to not only exclude a diagnosis of invasive aspergillosis but in combination with antigen testing may offer an approach for the early diagnosis and treatment of invasive aspergillosis in high-risk populations, with the added benefit of detection of genetic markers associated with antifungal resistance.
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Affiliation(s)
- Rosemary A Barnes
- Department of Medical Microbiology and Infectious Diseases, Cardiff University School of Medicine, Cardiff CF14 4XN, UK.
| | - P Lewis White
- Public Health Wales Microbiology, Cardiff CF14 4 XW, UK.
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Abstract
The direct detection of Aspergillus nucleic acid in clinical specimens has the potential to improve the diagnosis of aspergillosis by offering more rapid and sensitive identification of invasive infections than is possible with traditional techniques, such as culture or histopathology. Molecular tests for Aspergillus have been limited historically by lack of standardization and variable sensitivities and specificities. Recent efforts have been directed at addressing these limitations and optimizing assay performance using a variety of specimen types. This review provides a summary of standardization efforts and outlines the complexities of molecular testing for Aspergillus in clinical mycology.
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54
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Wattier RL, Ramirez-Avila L. Pediatric Invasive Aspergillosis. J Fungi (Basel) 2016; 2:jof2020019. [PMID: 29376936 PMCID: PMC5753081 DOI: 10.3390/jof2020019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Revised: 06/06/2016] [Accepted: 06/08/2016] [Indexed: 02/06/2023] Open
Abstract
Invasive aspergillosis (IA) is a disease of increasing importance in pediatrics due to growth of the immunocompromised populations at risk and improvements in long-term survival for many of these groups. While general principles of diagnosis and therapy apply similarly across the age spectrum, there are unique considerations for clinicians who care for children and adolescents with IA. This review will highlight important differences in the epidemiology, clinical manifestations, diagnosis, and therapy of pediatric IA.
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Affiliation(s)
- Rachel L Wattier
- Department of Pediatrics, Division of Infectious Diseases and Global Health, University of California-San Francisco, 550 16th St, 4th Floor, Box 0434, San Francisco, CA 94143, USA.
| | - Lynn Ramirez-Avila
- Department of Pediatrics, Division of Infectious Diseases and Global Health, University of California-San Francisco, 550 16th St, 4th Floor, Box 0434, San Francisco, CA 94143, USA.
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55
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Hayes GE, Novak-Frazer L. Chronic Pulmonary Aspergillosis-Where Are We? and Where Are We Going? J Fungi (Basel) 2016; 2:jof2020018. [PMID: 29376935 PMCID: PMC5753080 DOI: 10.3390/jof2020018] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Revised: 05/19/2016] [Accepted: 06/01/2016] [Indexed: 02/06/2023] Open
Abstract
Chronic pulmonary aspergillosis (CPA) is estimated to affect 3 million people worldwide making it an under recognised, but significant health problem across the globe, conferring significant morbidity and mortality. With variable disease forms, high levels of associated respiratory co-morbidity, limited therapeutic options and prolonged treatment strategies, CPA is a challenging disease for both patients and healthcare professionals. CPA can mimic smear-negative tuberculosis (TB), pulmonary histoplasmosis or coccidioidomycosis. Cultures for Aspergillus are usually negative, however, the detection of Aspergillus IgG is a simple and sensitive test widely used in diagnosis. When a fungal ball/aspergilloma is visible radiologically, the diagnosis has been made late. Sometimes weight loss and fatigue are predominant symptoms; pyrexia is rare. Despite the efforts of the mycology community, and significant strides being taken in optimising the care of these patients, much remains to be learnt about this patient population, the disease itself and the best use of available therapies, with the development of new therapies being a key priority. Here, current knowledge and practices are reviewed, and areas of research priority highlighted.
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Affiliation(s)
- Gemma E Hayes
- The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
- Manchester Academic Health Science Centre, 46 Grafton Street, Manchester M13 9NT, UK.
- National Aspergillosis Centre, 2nd Floor Education and Research Centre, University Hospital of South Manchester, Southmoor Road, Manchester M23 9LT, UK.
| | - Lilyann Novak-Frazer
- The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
- Manchester Academic Health Science Centre, 46 Grafton Street, Manchester M13 9NT, UK.
- The University of Manchester, Manchester Academic Health Science Centre, 2nd Floor Education and Research Centre, University Hospital of South Manchester, Southmoor Road, Manchester M23 9LT, UK.
- Mycology Reference Centre, Manchester, 2nd Floor Education and Research Centre, University Hospital of South Manchester, Southmoor Road, Manchester M23 9LT, UK.
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56
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Bernal-Martínez L, Alastruey-Izquierdo A, Cuenca-Estrella M. Diagnostics and susceptibility testing in Aspergillus. Future Microbiol 2016; 11:315-28. [PMID: 26848512 DOI: 10.2217/fmb.15.140] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
UNLABELLED Invasive aspergillosis is a major cause of morbidity and mortality in immunosuppressed patients. Early diagnosis and correct antifungal treatment have a direct impact on patient survival. A number of newer diagnostic procedures have been developed as alternatives to conventional microbiological methods. The detection of fungal components, largely antigens and DNA, are used in clinical laboratories to diagnose invasive aspergillosis. Other rapid diagnostic tests have been recently developed with promising results. However, antifungal resistance is becoming an emerging problem. The detection of this resistance is important to administer the proper antifungal agent. This text reviews the novelties on new diagnostics Aspergillus spp. PROCEDURES Intrinsic antifungal resistance and mechanisms of secondary resistance to triazoles in A. fumigatus are also reviewed.
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Affiliation(s)
- Leticia Bernal-Martínez
- Mycology Reference Laboratory, National Centre for Microbiology, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain; Spanish Network for the Research in Infectious Diseases (REIPI RD12/0015), Instituto de Salud Carlos III, Madrid, Spain
| | - Ana Alastruey-Izquierdo
- Mycology Reference Laboratory, National Centre for Microbiology, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain; Spanish Network for the Research in Infectious Diseases (REIPI RD12/0015), Instituto de Salud Carlos III, Madrid, Spain
| | - Manuel Cuenca-Estrella
- Mycology Reference Laboratory, National Centre for Microbiology, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain; Spanish Network for the Research in Infectious Diseases (REIPI RD12/0015), Instituto de Salud Carlos III, Madrid, Spain
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Pulya S, Kommagalla Y, Sant DG, Jorwekar SU, Tupe SG, Deshpande MV, Ramana CV. Re-engineering of PIP3-antagonist triazole PITENIN's chemical scaffold: development of novel antifungal leads. RSC Adv 2016. [DOI: 10.1039/c5ra25145a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A novel 4-(1-phenyl-1-hydroxyethyl)-1-(o-hydroxyphenyl)-1H-1,2,3-triazole was designed by integrating the structural features of triazole PITENIN anticancer agents and the azole class of antifungal drugs.
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Affiliation(s)
- Sravani Pulya
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Yadagiri Kommagalla
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Duhita G. Sant
- Biochemical Sciences Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Shweta U. Jorwekar
- Biochemical Sciences Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Santosh G. Tupe
- Biochemical Sciences Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Mukund V. Deshpande
- Biochemical Sciences Division
- CSIR-National Chemical Laboratory
- Pune-411008
- India
| | - Chepuri V. Ramana
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune-411008
- India
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58
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Quantitative Analysis of Single-Nucleotide Polymorphism for Rapid Detection of TR34/L98H- and TR46/Y121F/T289A-Positive Aspergillus fumigatus Isolates Obtained from Patients in Iran from 2010 to 2014. Antimicrob Agents Chemother 2015; 60:387-92. [PMID: 26525787 DOI: 10.1128/aac.02326-15] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 10/22/2015] [Indexed: 11/20/2022] Open
Abstract
We employed an endpoint genotyping method to update the prevalence rate of positivity for the TR34/L98H mutation (a 34-bp tandem repeat mutation in the promoter region of the cyp51A gene in combination with a substitution at codon L98) and the TR46/Y121F/T289A mutation (a 46-bp tandem repeat mutation in the promoter region of the cyp51A gene in combination with substitutions at codons Y121 and T289) among clinical Aspergillus fumigatus isolates obtained from different regions of Iran over a recent 5-year period (2010 to 2014). The antifungal activities of itraconazole, voriconazole, and posaconazole against 172 clinical A. fumigatus isolates were investigated using the European Committee on Antimicrobial Susceptibility Testing (EUCAST) broth microdilution method. For the isolates with an azole resistance phenotype, the cyp51A gene and its promoter were amplified and sequenced. In addition, using a LightCycler 480 real-time PCR system, a novel endpoint genotyping analysis method targeting single-nucleotide polymorphisms was evaluated to detect the L98H and Y121F mutations in the cyp51A gene of all isolates. Of the 172 A. fumigatus isolates tested, the MIC values of itraconazole (≥16 mg/liter) and voriconazole (>4 mg/liter) were high for 6 (3.5%). Quantitative analysis of single-nucleotide polymorphisms showed the TR34/L98H mutation in the cyp51A genes of six isolates. No isolates harboring the TR46/Y121F/T289A mutation were detected. DNA sequencing of the cyp51A gene confirmed the results of the novel endpoint genotyping method. By microsatellite typing, all of the azole-resistant isolates had genotypes different from those previously recovered from Iran and from the Dutch TR34/L98H controls. In conclusion, there was not a significant increase in the prevalence of azole-resistant A. fumigatus isolates harboring the TR34/L98H resistance mechanism among isolates recovered over a recent 5-year period (2010 to 2014) in Iran. A quantitative assay detecting a single-nucleotide polymorphism in the cyp51A gene of A. fumigatus is a reliable tool for the rapid screening and monitoring of TR34/L98H- and TR46/Y121F/T289A-positive isolates and can easily be incorporated into clinical mycology algorithms.
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59
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Haidar G, Falcione BA, Nguyen MH. Diagnostic Modalities for Invasive Mould Infections among Hematopoietic Stem Cell Transplant and Solid Organ Recipients: Performance Characteristics and Practical Roles in the Clinic. J Fungi (Basel) 2015; 1:252-276. [PMID: 29376911 PMCID: PMC5753113 DOI: 10.3390/jof1020252] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 08/28/2015] [Accepted: 08/31/2015] [Indexed: 12/19/2022] Open
Abstract
The morbidity and mortality of hematopoietic stem cell and solid organ transplant patients with invasive fungal infections (IFIs) remain high despite an increase in the number of effective antifungal agents. Early diagnosis leading to timely administration of antifungal therapy has been linked to better outcomes. Unfortunately, the diagnosis of IFIs remains challenging. The current gold standard for diagnosis is a combination of histopathology and culture, for which the sensitivity is <50%. Over the past two decades, a plethora of non-culture-based antigen and molecular assays have been developed and clinically validated. In this article, we will review the performance of the current commercially available non-cultural diagnostics and discuss their practical roles in the clinic.
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Affiliation(s)
- Ghady Haidar
- Department of Medicine, University of Pittsburgh Medical Center, Scaife Hall, Suite 871, 3550 Terrace Street, Pittsburgh, PA 15261, USA.
| | - Bonnie A Falcione
- Department of Medicine, University of Pittsburgh Medical Center, Scaife Hall, Suite 871, 3550 Terrace Street, Pittsburgh, PA 15261, USA.
- Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, 200 Lothrop St. 301, Pittsburgh, PA 15213, USA.
- Department of Medicine, University of Pittsburgh, Scaife Hall, Suite 871, 3550 Terrace Street, Pittsburgh, PA 15261, USA.
| | - M Hong Nguyen
- Department of Medicine, University of Pittsburgh Medical Center, Scaife Hall, Suite 871, 3550 Terrace Street, Pittsburgh, PA 15261, USA.
- Department of Medicine, University of Pittsburgh, Scaife Hall, Suite 871, 3550 Terrace Street, Pittsburgh, PA 15261, USA.
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International expert opinion on the management of infection caused by azole-resistant Aspergillus fumigatus. Drug Resist Updat 2015; 21-22:30-40. [PMID: 26282594 DOI: 10.1016/j.drup.2015.08.001] [Citation(s) in RCA: 230] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An international expert panel was convened to deliberate the management of azole-resistant aspergillosis. In culture-positive cases, in vitro susceptibility testing should always be performed if antifungal therapy is intended. Different patterns of resistance are seen, with multi-azole and pan-azole resistance more common than resistance to a single triazole. In confirmed invasive pulmonary aspergillosis due to an azole-resistant Aspergillus, the experts recommended a switch from voriconazole to liposomal amphotericin B (L-AmB; Ambisome(®)). In regions with environmental resistance rates of ≥10%, a voriconazole-echinocandin combination or L-AmB were favoured as initial therapy. All experts recommended L-AmB as core therapy for central nervous system aspergillosis suspected to be due to an azole-resistant Aspergillus, and considered the addition of a second agent with the majority favouring flucytosine. Intravenous therapy with either micafungin or L-AmB given as either intermittent or continuous therapy was recommended for chronic pulmonary aspergillosis due to a pan-azole-resistant Aspergillus. Local and national surveillance with identification of clinical and environmental resistance patterns, rapid diagnostics, better quality clinical outcome data, and a greater understanding of the factors driving or minimising environmental resistance are areas where research is urgently needed, as well as the development of new oral agents outside the azole drug class.
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