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Huang Y, Yi J, Song JJ, Du LJ, Li XM, Cheng LL, Yan SX, Li HL, Liu YM, Zhan HT, Dou YL, Li YZ. Negative serum (1,3) -β-D-glucan has a low power to exclude Pneumocystis jirovecii pneumonia (PJP) in HIV-uninfected patients with positive qPCR. Ann Clin Microbiol Antimicrob 2023; 22:102. [PMID: 37986091 PMCID: PMC10662630 DOI: 10.1186/s12941-023-00650-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 10/29/2023] [Indexed: 11/22/2023] Open
Abstract
OBJECTIVE The current study evaluated the diagnostic performance of serum (1,3)-beta-D Glucan (BDG) in differentiating PJP from P. jirovecii-colonization in HIV-uninfected patients with P. jirovecii PCR-positive results. METHODS This was a single-center retrospective study between 2019 and 2021. The diagnosis of PJP was based on the following criteria: detection of P. jirovecii in sputum or BAL specimen by qPCR or microscopy; Meet at least two of the three criteria: (1) have respiratory symptoms of cough and/or dyspnea, hypoxia; (2) typical radiological picture findings; (3) receiving a complete PJP treatment. After exclusion, the participants were divided into derivation and validation cohorts. The derivation cohort defined the cut-off value of serum BDG. Then, it was verified using the validation cohort. RESULTS Two hundred and thirteen HIV-uninfected patients were enrolled, with 159 PJP and 54 P. jirovecii-colonized patients. BDG had outstanding specificity, LR, and PPV for PJP in both the derivation (90.00%, 8.900, and 96.43%) and the validation (91.67%, 9.176, and 96.30%) cohorts at ≥ 117.7 pg/mL. However, it had lower sensitivity and NPV in the derivation cohort (89.01% and 72.97%), which was even lower in the validation cohort (76.47% and 57.89%). Of note, BDG ≥ 117.7 pg/mL has insufficient diagnostic efficacy for PJP in patients with lung cancer, interstitial lung disease (ILD) and nephrotic syndrome. And although lymphocytes, B cells, and CD4+ T cells in PJP patients were significantly lower than those in P. jirovecii-colonized patients, the number and proportion of peripheral blood lymphocytes did not affect the diagnostic efficacy of serum BDG. CONCLUSIONS Serum BDG ≥ 117.7 pg/mL could effectively distinguish P. jirovecii-colonization from infection in qPCR-positive HIV-uninfected patients with infectious diseases, solid tumors (excluding lung cancer), autoimmune or inflammatory disorders, and hematological malignancies. Of note, for patients with lung cancer, ILD, and nephrotic diseases, PJP should be cautiously excluded at BDG < 117.7 pg/mL.
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Affiliation(s)
- Yuan Huang
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Jie Yi
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Jing-Jing Song
- Department of Clinical Laboratory, The Maternal and Child Health Hospital Affiliated to Anhui Medical University, Hefei, Anhui, 230001, China
| | - Li-Jun Du
- Department of Clinical Laboratory, Nanchong Central Hospital, the Second Clinical Medical College, North Sichuan Medical College, Nanchong, Sichuan Province, 637000, China
| | - Xiao-Meng Li
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Lin-Lin Cheng
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Song-Xin Yan
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Hao-Long Li
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Yong-Mei Liu
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Hao-Ting Zhan
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China
| | - Ya-Ling Dou
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China.
| | - Yong-Zhe Li
- Department of Clinical Laboratory, Peking Union Medical College Hospital, Dongcheng District, Beijing, 100730, China.
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Cabanilla MG, Briski MJ, Bruss Z, Saa L, Vasquez PC, Rodriguez CN, Mitchell JA, Bernauer ML, Argyropoulos CP, Crandall CS, Teixeira JP. The influence of continuous renal replacement therapy on 1,3-β-d-glucan levels in critically ill patients: a single-center retrospective propensity score study. Ren Fail 2023; 45:2255680. [PMID: 37781748 PMCID: PMC10547441 DOI: 10.1080/0886022x.2023.2255680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Accepted: 08/31/2023] [Indexed: 10/03/2023] Open
Abstract
1,3-β-d-Glucan (BDG) is commonly used for diagnosing invasive fungal infections (IFIs). While exposure to cellulose-based hemodialyzers is known to cause false-positive BDG results, the impact of modern hemofilters used in continuous renal replacement therapy (CRRT) remains unclear. This retrospective, single-center cohort study aimed to evaluate the effect of CRRT on BDG levels in critically ill patients. We included adult intensive care unit (ICU) patients with ≥1 BDG measurement between December 2019 and December 2020. The primary outcome was the rate of false-positive BDG results in patients exposed to CRRT compared to unexposed patients. Propensity score analysis was performed to control for confounding factors. A total of 103 ICU patients with ≥1 BDG level were identified. Most (72.8%) were medical ICU patients. Forty patients underwent CRRT using hemofilter membranes composed of sodium methallyl sulfonate copolymer (AN 69 HF) (82.5%) and of polyarylethersulfone (PAES) (17.5%). Among the 91 patients without proven IFI, 31 (34.1%) had false-positive BDG results. Univariable analysis showed an association between CRRT exposure and false-positive BDG results. However, the association between CRRT exposure and false-positive BDG results was no longer significant across three propensity score models employed: 1:1 match (n = 32) (odds ratio (OR) 1.65, p = .48), model-adjusted (n = 91) (OR 1.75, p = .38), quintile-adjusted (n = 91) (OR 1.78, p = .36). In this single-center retrospective analysis, exposure to synthetic CRRT membranes did not independently increase the risk of false-positive BDG results. Larger prospective studies are needed to further evaluate the association between CRRT exposure and false-positive BDG results in critically ill patients with suspected IFI.
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Affiliation(s)
- M. Gabriela Cabanilla
- Department of Internal Medicine and Department of Pharmacy, Division of Infectious Diseases, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Matthew J. Briski
- Department of Pharmacy, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Zachary Bruss
- Department of Internal Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Lisa Saa
- Department of Internal Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Pamela C. Vasquez
- Department of Internal Medicine, Division of Nephrology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Chelsea N. Rodriguez
- Department of Pharmacy, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Jessica A. Mitchell
- Department of Emergency Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | | | - Christos P. Argyropoulos
- Department of Internal Medicine, Division of Nephrology, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - Cameron S. Crandall
- Department of Emergency Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
| | - J. Pedro Teixeira
- Department of Internal Medicine, Division of Nephrology, Division of Pulmonary, Critical Care and Sleep Medicine, University of New Mexico Health Sciences Center, Albuquerque, NM, USA
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Nyuykonge B, Siddig E, Mhmoud NA, Bakhiet S, Zijlstra E, Verbon A, Fahal AH, van de Sande WWJ. Wako β-D-glucan assay can be used to measure serum β-D-glucan in Sudanese patients to aid with diagnosis of eumycetoma caused by Madurella mycetomatis. J Eur Acad Dermatol Venereol 2023; 37:783-786. [PMID: 36201367 DOI: 10.1111/jdv.18642] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 09/14/2022] [Indexed: 11/27/2022]
Abstract
BACKGROUND Eumycetoma is a neglected tropical infection of the subcutaneous tissue commonly caused by the fungus Madurella mycetomatis. Previously, we demonstrated that β-D-glucan was present in the serum of eumycetoma patients. OBJECTIVE To compare the performance of the recently approved easy-to-use Wako β-D-glucan assay to that of the Fungitell assay in eumycetoma patients. METHODS Using sera obtained from 41 eumycetoma, 12 actinomycetoma and 29 healthy endemic controls, we measured the β-glucan serum concentrations using the Wako assay and compared the performance to that of the Fungitell assay. RESULTS With the Fungitell assay, median β-glucan serum concentrations of 208, 70 and 27 pg/ml were obtained for the 41 eumycetoma patients, the 12 actinomycetoma patients and the 29 healthy endemic controls, respectively. With the Wako assay these concentrations were 14.45, 11.57 and 2.5 pg/ml, respectively. We demonstrated that when using the optimized cut-off value (5.5 pg/ml) for the Wako assay, the Wako and Fungitell assays had comparable performance in terms of sensitivity and specificity. CONCLUSION The Wako assay is comparable to the Fungitell assay for measurement of serum β-glucan in mycetoma patients and hence can be used in combination with current diagnostic tools. However, this test should be used in combination with other tests to differentiate actinomycetoma from eumycetoma.
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Affiliation(s)
- Bertrand Nyuykonge
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - Emmanuel Siddig
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands.,Mycetoma Research Centre, University of Khartoum, Khartoum, Sudan
| | - Najwa A Mhmoud
- Mycetoma Research Centre, University of Khartoum, Khartoum, Sudan
| | - Sahar Bakhiet
- Mycetoma Research Centre, University of Khartoum, Khartoum, Sudan
| | - Eduard Zijlstra
- Drugs for Neglected Diseases Initiative (DNDi), Geneva, Switzerland
| | - Annelies Verbon
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
| | - Ahmed H Fahal
- Mycetoma Research Centre, University of Khartoum, Khartoum, Sudan
| | - Wendy W J van de Sande
- Department of Medical Microbiology and Infectious Diseases, Erasmus MC University Medical Centre Rotterdam, Rotterdam, The Netherlands
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He Z, Huo X, Piao J. Rapid preparation of Candida genomic DNA: combined use of enzymatic digestion and thermal disruption. AMB Express 2023; 13:1. [PMID: 36592236 PMCID: PMC9807692 DOI: 10.1186/s13568-022-01500-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 12/07/2022] [Indexed: 01/03/2023] Open
Abstract
Nucleic acid based molecular technologies are the most promising tools for the early diagnosis of Candida infection. A simple and effective DNA preparation method is of critical for standardizing and applying molecular diagnostics in clinic laboratories. The goal of this study was to develop a Candida DNA preparation method that was quick to do, easy to perform, and bio-safe. Snailase and lyticase were screened and combined in this work to enhance the lysis of Candida cells. The lysis solution composition and metal bath were optimized to boost amplification efficiency and biosafety. A duplex real-time PCR was established to evaluate the sensitivity and specificity of the preparation method. Using the supernatant from the rapid preparation method as templates, the duplex PCR sensitivities for five common Candida species were determined to be as low as 100 CFUs. When compared to conventional preparation methods, the samples prepared by our method showed higher PCR detection sensitivity. PCR identification and ITS sequencing were 100% consistent, which was better than biochemical identification. This study demonstrates a rapid method for Candida DNA preparation that has the potential to be used in clinical laboratories. Meanwhile, the practical application of the method for clinical samples needs to be proven in future investigations.
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Affiliation(s)
- Zhengxin He
- grid.452440.30000 0000 8727 6165Basic Medical Laboratory, The 980th Hospital of PLA Joint Logistical Support Force (Bethune International Peace Hospital), 398 Zhongshan Road, Shijiazhuang, 050082 Hebei People’s Republic of China
| | - Xiaosai Huo
- grid.452440.30000 0000 8727 6165Basic Medical Laboratory, The 980th Hospital of PLA Joint Logistical Support Force (Bethune International Peace Hospital), 398 Zhongshan Road, Shijiazhuang, 050082 Hebei People’s Republic of China
| | - Jingzi Piao
- grid.412557.00000 0000 9886 8131College of Plant Protection, Shenyang Agricultural University, 120 Dongling Road, Shenyang, 110866 Liaoning People’s Republic of China
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Piao J, Li N, Zhang L, Meng H, Sun Q, He Z. Quantitatively detecting Candida albicans enolase1 with a one-step double monoclonal antibody sandwich ELISA assay. Front Microbiol 2023; 14:1078709. [PMID: 36891387 PMCID: PMC9986313 DOI: 10.3389/fmicb.2023.1078709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 01/30/2023] [Indexed: 02/22/2023] Open
Abstract
Invasive candidiasis (IC) is often a cause of severe concern for the hospitalized patients, particularly those who are critically sick. However management of this disease is challenging due to a lack of effective laboratory diagnostic techniques. Hence, we have developed a one-step double antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) using a pair of specific monoclonal antibodies (mAbs) for the quantitative detection of Candida albicans enolase1 (CaEno1), which is considered as an important diagnostic biomarker for IC. The diagnostic efficiency of the DAS-ELISA was evaluated by using a rabbit model of systemic candidiasis and compared with other assays. The method validation results demonstrated that the developed method was sensitive, reliable, and feasible. The findings of the rabbit model plasma analysis indicated that the diagnostic efficiency of the CaEno1 detection assay was better in comparison to the (1,3)-β-D-glucan detection and blood culture. CaEno1 is present in the blood of infected rabbits for a brief period and at relatively low levels and thus the combination of CaEno1 antigen and IgG antibodies detection could aid to increase diagnostic efficiency. However, to improve the clinical application of CaEno1 detection in the future, efforts should be made to increase the detection limit of the test by promoting technical developments and by optimizing the protocol for the clinical serial determinations.
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Affiliation(s)
- Jingzi Piao
- College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning, China
| | - Ning Li
- Shenyang Institute for Food and Drug Control, Shenyang, Liaoning, China
| | - Lina Zhang
- Basic Medicine Laboratory, Bethune International Peace Hospital, Shijiazhuang, Hebei, China
| | - Hanbing Meng
- Basic Medicine Laboratory, Bethune International Peace Hospital, Shijiazhuang, Hebei, China
| | - Qingqing Sun
- Basic Medicine Laboratory, Bethune International Peace Hospital, Shijiazhuang, Hebei, China
| | - Zhengxin He
- Basic Medicine Laboratory, Bethune International Peace Hospital, Shijiazhuang, Hebei, China
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Kobe H, Momose M, Miyazaki Y, Nishihara C, Yoshida T, Ishida T. A 73-Year-Old Man With Refractory Hemoptysis. Chest 2022; 162:e165-e168. [DOI: 10.1016/j.chest.2022.04.148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/18/2022] [Accepted: 04/13/2022] [Indexed: 11/06/2022] Open
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Yamamoto T, Oishi K, Suizu J, Murakawa K, Hisamoto Y, Fujii T, Harada M, Chikumoto A, Kikuchi Y, Hamada K, Uehara S, Ohata S, Murata Y, Sakamoto K, Yamaji Y, Asami-Noyama M, Edakuni N, Kakugawa T, Hirano T, Matsunaga K. False-positive Elevation of Beta-D-glucan and Aspergillus Galactomannan Levels Due to Mendelson's Syndrome after Rice Aspiration. Intern Med 2022; 61:2935-2939. [PMID: 35314546 PMCID: PMC9593144 DOI: 10.2169/internalmedicine.8805-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Both 1,3-beta-D-glucan (BDG) and galactomannan (GM) are polysaccharide components of the fungal cell wall. Although elevated levels of serum BDG and Aspergillus GM suggest invasive fungal infection or Pneumocystis pneumonia and aspergillosis, respectively, it is also necessary to consider the possibility of false-positives. We herein report a 68-year-old man with marked elevation in serum BDG and GM levels accompanied by Mendelson's syndrome after rice aspiration. With the improvement of Mendelson's syndrome, his serum BDG and GM levels decreased. The false-positive serum BDG and GM findings may have been due to his aspiration of food containing them. It is important to take a detailed history of aspiration in addition to making a conventional differential diagnosis in patients with pneumonia with elevated serum BDG and GM levels.
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Affiliation(s)
- Tasuku Yamamoto
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Keiji Oishi
- Department of Medicine and Clinical Science, Graduate School of Medicine, Yamaguchi University, Japan
| | - Junki Suizu
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Keita Murakawa
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Yukari Hisamoto
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Tetsuya Fujii
- Department of Medicine and Clinical Science, Graduate School of Medicine, Yamaguchi University, Japan
| | - Misa Harada
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Ayumi Chikumoto
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Yujiro Kikuchi
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Kazuki Hamada
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Sho Uehara
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Syuichiro Ohata
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Yoriyuki Murata
- Department of Medicine and Clinical Science, Graduate School of Medicine, Yamaguchi University, Japan
| | - Kenji Sakamoto
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Yoshikazu Yamaji
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Maki Asami-Noyama
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Nobutaka Edakuni
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Tomoyuki Kakugawa
- Department of Pulmonology and Gerontology, Graduate School of Medicine, Yamaguchi University, Japan
| | - Tsunahiko Hirano
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
| | - Kazuto Matsunaga
- Department of Respiratory Medicine and Infectious Disease, Graduate School of Medicine, Yamaguchi University, Japan
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Mikulska M, Balletto E, Castagnola E, Mularoni A. Beta-D-Glucan in Patients with Haematological Malignancies. J Fungi (Basel) 2021; 7:jof7121046. [PMID: 34947028 PMCID: PMC8706797 DOI: 10.3390/jof7121046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 12/12/2022] Open
Abstract
(1-3)-beta-D-glucan (BDG) is an almost panfungal marker (absent in zygomycetes and most cryptococci), which can be successfully used in screening and diagnostic testing in patients with haematological malignancies if its advantages and limitations are known. The aim of this review is to report the data, particularly from the last 5 years, on the use of BDG in haematological population. Published data report mainly on the performance of the Fungitell™ assay, although several others are currently available, and they vary in method and cut-off of positivity. The sensitivity of BDG for invasive fungal disease (IFD) in haematology patients seems lower than in other populations, possibly because of the type of IFD (lower sensitivity was found in case of aspergillosis compared to candidiasis and pneumocystosis) or the use of prophylaxis. The specificity of the test can be improved by using two consecutive positive assays and avoiding testing in the case of the concomitant presence of factors associated with false positive results. BDG should be used in combination with clinical assessment and other diagnostic tests, both radiological and mycological, to provide maximum information. Good performance of BDG in cerebrospinal fluid (CSF) has been reported. BDG is a useful diagnostic method in haematology patients, particularly for pneumocystosis or initial diagnosis of invasive fungal infections.
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Affiliation(s)
- Malgorzata Mikulska
- Division of Infectious Diseases, Department of Health Sciences (DISSAL), University of Genoa, 16132 Genoa, Italy
- Division of Infectious Diseases, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy;
- Correspondence: ; Tel.: +39-010-555-4649
| | - Elisa Balletto
- Division of Infectious Diseases, IRCCS Ospedale Policlinico San Martino, 16132 Genoa, Italy;
| | - Elio Castagnola
- Infectious Diseases Unit, Department of Pediatrics, Istituto Giannina Gaslini, 16147 Genova, Italy;
| | - Alessandra Mularoni
- IRCCS-ISMETT (Istituto Mediterraneo per i Trapianti e Terapie ad Alta Specializzazione), 90127 Palermo, Italy;
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Challenges with Utilizing the 1,3-Beta-d-Glucan and Galactomannan Assays To Diagnose Invasive Mold Infections in Immunocompromised Children. J Clin Microbiol 2021; 59:e0327620. [PMID: 33883182 DOI: 10.1128/jcm.03276-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Establishing the diagnosis of invasive mold infections (IMI) in immunocompromised children is challenging due to nonspecific clinical presentations and the limited sensitivity of traditional culture-based methods. Rapid non-culture-based diagnostics such as the 1,3-beta-d-glucan and galactomannan assays have emerged as promising adjuncts to conventional diagnostic tests in adults. Available data suggest that 1,3-beta-d-glucan has limited accuracy in the pediatric population and is not recommended to be used for the diagnosis of IMI in children. On the other hand, the diagnostic performance of the serum and bronchoalveolar lavage galactomannan in immunocompromised children is comparable to results observed in adults and can be used as a screening tool in children at high risk of developing invasive aspergillosis (IA) who are not receiving mold-active antifungal prophylaxis and as a diagnostic tool in symptomatic children suspected of having IA. Herein, we summarize the available evidence for the use of these rapid non-culture-based diagnostics in immunocompromised children. We also summarize potential causes of false positivity for the 1,3-beta-d-glucan and galactomannan assays.
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10
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Szvalb AD, Malek AE, Jiang Y, Bhatti MM, Wurster S, Kontoyiannis DP. Serum (1,3)-Beta-d-Glucan has suboptimal performance for the diagnosis of Pneumocystis jirovecii pneumonia in cancer patients and correlates poorly with respiratory burden as measured by quantitative PCR. J Infect 2020; 81:443-451. [PMID: 32650108 DOI: 10.1016/j.jinf.2020.07.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 06/29/2020] [Accepted: 07/03/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Non-HIV immunocompromised patients with Pneumocystis jirovecii pneumonia (PCP) have lower fungal load than those with AIDS, potentially affecting the accuracy of diagnostic biomarkers. Therefore, we investigated the performance of serum (1,3)-Beta-d-Glucan (BDG) in conjunction with quantitative Pneumocystis jirovecii PCR (qPCR) in non-HIV cancer patients. METHODS We reviewed records of non-HIV cancer patients and classified them as definite, probable, or possible PCP cases, according to clinicoradiological features, microscopy findings, and qPCR results in bronchoscopy specimens. We evaluated the diagnostic performance of serum BDG and its correlation with qPCR results. RESULTS We identified 101 PCP patients (73 definite/probable, 28 possible) and 74 controls. Correlation of BDG and qPCR was low among all 101 qPCR-positive patients (Spearman's = 0.38) and in definite/probable PCP cases (Spearman's = 0.18). Considering all qPCR-positive patients, BDG showed consistently low sensitivity at different cutoffs. Among definite/probable cases, the diagnostic accuracy of BDG remained poor, yet slightly improved with high qPCR thresholds (AUC = 0.86 at ≥2000 DNA copies/mL). BDG had a low PPV but excellent NPV across different qPCR and BDG cutoffs. CONCLUSIONS BDG and qPCR levels correlate poorly in non-HIV cancer patients with PCP. BDG diagnostic performance is suboptimal but a negative test may be useful to rule out PCP in this population.
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Affiliation(s)
- Ariel D Szvalb
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
| | - Alexandre E Malek
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Ying Jiang
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Micah M Bhatti
- Department of Laboratory Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Sebastian Wurster
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
| | - Dimitrios P Kontoyiannis
- Department of Infectious Diseases, Infection Control and Employee Health, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
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11
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Diagnostic accuracy of serum (1-3)-β-D-glucan for Pneumocystis jirovecii pneumonia: a systematic review and meta-analysis. Clin Microbiol Infect 2020; 26:1137-1143. [PMID: 32479781 DOI: 10.1016/j.cmi.2020.05.024] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 05/19/2020] [Accepted: 05/20/2020] [Indexed: 12/31/2022]
Abstract
BACKGROUND Pneumocystis jirovecii pneumonia (PJP) can be a life-threatening opportunistic infection in immunocompromised hosts. The diagnosis can be challenging, often requiring semi-invasive respiratory sampling. The serum 1,3-β-D-glucan (BDG) assay has been proposed as a minimally invasive test for the presumptive diagnosis of PJP. METHOD We carried out a systematic review and meta-analysis using articles in the English language published between January 1960 and September 2019. We estimated the pooled sensitivity and specificity of BDG testing using a bivariate random effects approach and compared test performance in human immunodeficiency virus (HIV) and non-HIV subgroups with meta-regression. Data from the pooled sensitivity and specificity were transformed to generate pre- and post-test probability curves. RESULTS Twenty-three studies were included. The pooled sensitivity and specificity of serum BDG testing for PJP were 91% (95%CI 87-94%) and 79% (95%CI 72-84%) respectively. The sensitivity in patients with HIV was better than in patients without (94%, 95%CI 91-96%) versus 86% (95%CI 78-91%) (p 0.02), with comparable specificity (83%, 95%CI 69-92% versus 83%, 95%CI 72-90%) (p 0.10). A negative BDG was only associated with a low post-test probability of PJP (≤5%) when the pre-test probability was low to intermediate (≤20% in non-HIV and ≤50% in HIV). CONCLUSIONS Among patients with a higher likelihood of PJP, the pooled sensitivity of BDG is insufficient to exclude infection. Similarly, for most cases, the pooled specificity is inadequate to diagnose PJP. Understanding the performance of BDG in the population being investigated is therefore essential to optimal clinical decision-making.
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