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Bunse T, Ziel A, Hagen P, Rigopoulos G, Yasar U, Inan H, Köse G, Eigner U, Kaiser R, Bardeck N, Köffer J, Kolb M, Ren X, Tan D, Dai L, Protzer U, Wettengel JM. Analytical and clinical evaluation of a novel real-time PCR-based detection kit for Mpox virus. Med Microbiol Immunol 2024; 213:18. [PMID: 39101951 DOI: 10.1007/s00430-024-00800-4] [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: 11/17/2023] [Accepted: 07/14/2024] [Indexed: 08/06/2024]
Abstract
Outbreaks of emerging diseases, like Mpox in 2022, pose unprecedented challenges to global healthcare systems. Although Mpox cases globally decreased since the end of 2022, numbers are still significant in the African Region, European Region, Region of the Americas, and Western Pacific Region. Rapid and efficient detection of infected individuals by precise screening assays is crucial for successful containment. In these assays, analytical and clinical performance must be assessed to ensure high quality. However, clinical studies evaluating Mpox virus (MPXV) detection kits using patient-derived samples are scarce. This study evaluated the analytical and clinical performance of a new diagnostic MPXV real-time PCR detection kit (Sansure Monkeypox Virus Nucleic Acid Diagnostic Kit) using patient-derived samples collected in Germany during the MPXV clade IIb outbreak in 2022. Our experimental approach determined the Limit of Detection (LoD) to less than 200 cp/mL using whole blood samples and samples derived from vesicles or pustules. Furthermore, we tested potentially inhibiting substances and pathogens with homologous nucleic acid sequences or similar clinical presentation and detected no cross-reactivity or interference. Following this, the assay was compared to a CE-marked test in a clinical performance study and achieved a diagnostic sensitivity of 100.00% and diagnostic specificity of 96.97%. In summary, the investigated real-time PCR assay demonstrates high analytical performance and concurs with the competitor device with high specificity and sensitivity.
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Affiliation(s)
- Till Bunse
- School of Medicine and Health, Institute of Virology, Technical University of Munich, 81675, Munich, Germany
- Institute of Virology, Helmholtz Munich, 81675, Munich, Germany
- German Center for Infection Research (DZIF), Munich Partner Site, 81675, Munich, Germany
| | - Anne Ziel
- Requalite GmbH, 82166, Graefelfing, Germany
| | - Philipp Hagen
- Institute of Virology, Helmholtz Munich, 81675, Munich, Germany
| | - George Rigopoulos
- School of Medicine and Health, Institute of Virology, Technical University of Munich, 81675, Munich, Germany
| | - Umit Yasar
- Requalite GmbH, 82166, Graefelfing, Germany
| | - Hakan Inan
- Requalite GmbH, 82166, Graefelfing, Germany
| | | | | | - Rolf Kaiser
- Institute of Virology, University of Cologne, 50935, Cologne, Germany
| | - Nils Bardeck
- Institute of Virology, University of Cologne, 50935, Cologne, Germany
| | | | - Melissa Kolb
- MVZ Labor Dr. Limbach, 69126, Heidelberg, Germany
| | - Xiaomei Ren
- National Genetic Detection Technology Application Demonstration Center, Sansure Biotech Inc, Changsha, 410205, People's Republic of China
| | - Deyong Tan
- National Genetic Detection Technology Application Demonstration Center, Sansure Biotech Inc, Changsha, 410205, People's Republic of China
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha, 410008, People's Republic of China
| | - Lizhong Dai
- National Genetic Detection Technology Application Demonstration Center, Sansure Biotech Inc, Changsha, 410205, People's Republic of China
| | - Ulrike Protzer
- School of Medicine and Health, Institute of Virology, Technical University of Munich, 81675, Munich, Germany
- Institute of Virology, Helmholtz Munich, 81675, Munich, Germany
- German Center for Infection Research (DZIF), Munich Partner Site, 81675, Munich, Germany
| | - Jochen M Wettengel
- School of Medicine and Health, Institute of Virology, Technical University of Munich, 81675, Munich, Germany.
- Institute of Virology, Helmholtz Munich, 81675, Munich, Germany.
- German Center for Infection Research (DZIF), Munich Partner Site, 81675, Munich, Germany.
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Peng Y, Hu R, Xue S, He Y, Tian L, Pang Z, He Y, Dong Y, Shi Y, Wang S, Hong B, Liu K, Wang R, Song L, Fan H, Li M, Tong Y. Rapid and highly sensitive colorimetric LAMP assay and integrated device for visual detection of monkeypox virus. Anal Chim Acta 2024; 1311:342720. [PMID: 38816155 DOI: 10.1016/j.aca.2024.342720] [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: 01/03/2024] [Revised: 04/30/2024] [Accepted: 05/12/2024] [Indexed: 06/01/2024]
Abstract
BACKGROUND The monkeypox virus (MPXV) is a linear double-stranded DNA virus with a large genome that causes tens of thousands of infections and hundreds of deaths in at least 40 countries and regions worldwide. Therefore, timely and accurate diagnostic testing could be an important measure to prevent the ongoing spread of MPXV and widespread epidemics. RESULTS Here, we designed multiple sets of primers for the target region of MPXV for loop-mediated isothermal amplification (LAMP) detection and identified the optimal primer set. Then, the specificity in fluorescent LAMP detection was verified using the plasmids containing the target gene, pseudovirus and other DNA/RNA viruses. We also evaluated the sensitivity of the colorimetric LAMP detection system using the plasmid and pseudovirus samples, respectively. Besides, we used monkeypox pseudovirus to simulate real samples for detection. Subsequent to the establishment and introduction of a magnetic beads (MBs)-based nucleic acid extraction technique, an integrated device was developed, characterized by rapidity, high sensitivity, and remarkable specificity. This portable system demonstrated a visual detection limit of 137 copies/mL, achieving sample-to-answer detection within 1 h. SIGNIFICANCE The device has the advantages of integration, simplicity, miniaturization, and visualization, which help promote the realization of accurate, rapid, portable, and low-cost testing. Meanwhile, this platform could facilitate efficient, cost-effective and easy-operable point-of-care testing (POCT) in diverse resource-limited settings in addition to the laboratory.
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Affiliation(s)
- Yadan Peng
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Ruolan Hu
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Shuang Xue
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Yugan He
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Lili Tian
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Zehan Pang
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Yile He
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Yuqi Dong
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Yinghan Shi
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Shuqi Wang
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Bixia Hong
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Ke Liu
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Ruixue Wang
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Lihua Song
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Huahao Fan
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China; School of Life Sciences, Tianjin University, Tianjin, 300072, China.
| | - Mengzhe Li
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
| | - Yigang Tong
- College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China; Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
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Lin Y, Yang J, Wang X, Yang J, Dong L. Establishment of reference measurement procedure and reference material for Treponema pallidum. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:1244-1251. [PMID: 38319302 DOI: 10.1039/d3ay01906c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Stem cell preparations, as a new type of biotherapeutic product, should be subject to strict quality control in terms of cell safety. The testing of stem cell donors and blood products used in stem cell cultures, including but not limited to Treponema pallidum, is needed to reduce the risk of transmission of infectious diseases by stem cell medical products. In this study, a reference measurement procedure (RMP) was established based on digital PCR (dPCR). A homogeneous reference material (RM) of TP containing the tpp47 gene has been developed and characterized. Two dPCR assays (A and B) show ideal linearity within five orders of magnitude. The limit of quantification (LoQ) for both assays is 57 copies/reaction; the limits of detection (LoD) are 9.69 and 9.59 copies/reaction, respectively. The quantitative results of the established duplex dPCR assay are in good agreement. The RM of TP containing the tpp47 gene has been developed and characterized. The reference value with its expanded uncertainty is (2.21 ± 0.22) × 106 copies per μL determined by the established dPCR RMP. The developed dPCR was validated by applying a simulated stem cell matrix, and no impact was observed on the accuracy of dPCR. By providing an accurate reference value for the absolute copy number of the target gene, the developed RM can be used to improve the reliability of TP testing in the production of stem cell preparations and clinical diagnostics.
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Affiliation(s)
- Yanmin Lin
- College of Food Science and Technology, Shanghai Ocean University, 201306, Shanghai, P. R. China.
- Center for Advanced Measurement of Science, National Institute of Metrology, 100029, Beijing, P. R. China.
| | - Jiayi Yang
- Center for Advanced Measurement of Science, National Institute of Metrology, 100029, Beijing, P. R. China.
| | - Xia Wang
- Center for Advanced Measurement of Science, National Institute of Metrology, 100029, Beijing, P. R. China.
| | - Jingya Yang
- College of Food Science and Technology, Shanghai Ocean University, 201306, Shanghai, P. R. China.
- Marine Biomedical Science and Technology Innovation Platform of Lin-gang Special Area, 201306, Shanghai, P. R. China
| | - Lianhua Dong
- Center for Advanced Measurement of Science, National Institute of Metrology, 100029, Beijing, P. R. China.
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Chen G, Li H, Gao Y, Zhao H, Yang J, Dong L. Establishment of Digital PCR Method and Reference Material for Adenoviruses 40 and 41. Foodborne Pathog Dis 2023; 20:453-459. [PMID: 37590500 DOI: 10.1089/fpd.2023.0011] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023] Open
Abstract
Coinfection with human adenovirus (HAdV) and SARS-CoV-2 has been associated with acute hepatitis in children with unknown etiology. Similar cases have been reported in many countries, and HAdV 40 and HAdV 41 have been identified. The quantification method is established based on digital PCR (dPCR) for HAdV 40/41, which is more convenient for low-concentration virus detection. The limit of detections of HAdV 40/41 dPCR were 4 and 5 copies/μL. Pseudovirus reference material (RM) that contains the highly conserved HEXON gene was developed and quantified with the dPCR method. The assigned values with expanded uncertainty were (1.43 ± 0.35) × 103 copies/μL for HAdV 40 RM and (1.21 ± 0.28) × 103 copies/μL for HAdV 41 RM. The values could be reproduced on multiple platforms. The dPCR method and pseudovirus RMs contribute to the improved accuracy of HAdV 40/41 detection, which is crucial for clinical diagnosis.
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Affiliation(s)
- Guifang Chen
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
| | - Huijie Li
- Shenzhen Institute for Technology Innovation, National Institute of Metrology, Shenzhen, China
| | - Yunhua Gao
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
| | - Hang Zhao
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, China
| | - Jiayi Yang
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
| | - Lianhua Dong
- Center for Advanced Measurement Science, National Institute of Metrology, Beijing, China
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Pomari E, Mori A, Accordini S, Donini A, Cordioli M, Tacconelli E, Castilletti C. Evaluation of a ddPCR Commercial Assay for the Absolute Quantification of the Monkeypox Virus West Africa in Clinical Samples. Diagnostics (Basel) 2023; 13:diagnostics13071349. [PMID: 37046567 PMCID: PMC10093040 DOI: 10.3390/diagnostics13071349] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 03/23/2023] [Accepted: 04/03/2023] [Indexed: 04/14/2023] Open
Abstract
BACKGROUND Monkeypox virus (MPXV) is a double-stranded DNA virus belonging to the orthopoxvirus genus in the family Poxviridae. Distinct clades are identified: the clade I belonging to the Central African (or Congo Basin) clade and the subclades IIa and IIb belonging to the West African clade. Here, a commercial droplet digital PCR (ddPCR) assay was evaluated for the quantification of the MPXV West Africa clade in clinical samples. METHODS The ddPCR reaction was assessed as a duplex assay using RPP30 as an internal amplification control. A total of 60 clinical specimens were tested, 40 positives (skin lesions, n=10; rectal swabs, n = 10; pharyngeal swabs, n = 10; and whole blood, n = 10), and 20 negatives (n = 5 for each biological matrix) were found at the routine molecular diagnostics (orthopoxvirus qPCR followed by confirmation with Sanger sequencing). To evaluate the analytical sensitivity, the ddPCR reaction was first analyzed on serial dilutions of synthetic DNA spiked in water and in negative biological matrices, achieving a limit of detection of 3.5 copy/µL. RESULTS Regarding the clinical samples, compared to routine molecular diagnostics, the ddPCR duplex assay showed 100% of specificity for all biological matrices and 100% sensitivity (10/10) for lesions, 100% (10/10) for rectal swabs, 90% (9/10) for pharyngeal swabs, and 60% (6/10) for whole blood. CONCLUSION Overall, our data showed that the commercial ddPCR assay allowed the DNA detection of MPXV in 87.5% (35/40) of our cohort, highlighting useful technical indications for the different specimens with a potential greatest performance for skin lesions and rectal swabs.
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Affiliation(s)
- Elena Pomari
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy
| | - Antonio Mori
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy
| | - Silvia Accordini
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy
| | - Annalisa Donini
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy
| | - Maddalena Cordioli
- Division of Infectious Diseases, Department of Diagnostic and Public Health, University of Verona, 37100 Verona, Italy
- Division of Infectious Diseases, Department of Medicine, Verona University Hospital, 37100 Verona, Italy
| | - Evelina Tacconelli
- Division of Infectious Diseases, Department of Medicine, Verona University Hospital, 37100 Verona, Italy
| | - Concetta Castilletti
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy
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