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Chen B, Li L, Yang Q, Zhang M. Self-corrected dual-optical immunosensors using carbon dots@SiO 2@MnO 2 improving diethyl phthalate detection accuracy. Talanta 2023; 261:124652. [PMID: 37207508 DOI: 10.1016/j.talanta.2023.124652] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 04/11/2023] [Accepted: 05/04/2023] [Indexed: 05/21/2023]
Abstract
The traditional immunoassay is widely used for pollutant detection and bioanalysis, but there are still some challenges in ensuring its sensitivity and reliable accuracy. Dual-optical measurement can prove mutual evidence to effectively improve the accuracy of the method by self-correction, which will overcome this problem. In this study, we developed a "visualization and sensing" dual-modal immunoassay based on blue carbon dots@SiO2@MnO2 (B-CDs@SiO2@MnO2) as "color and fluorescence" immunosensors. Here, MnO2 nanosheets have the activity of simulating oxidase. 3,3', 5,5'-Tetramethylbenzidine (TMB) can be oxidized to TMB2+ under acidic conditions and the color of the solution from colorless to yellow. On the other hand, the MnO2 nanosheets can quench the fluorescence of B-CDs@SiO2. After adding ascorbic acid (AA), MnO2 nanosheets were reduced to Mn2+, thereby the fluorescence of B-CDs@SiO2 was restored. Under the optimum conditions, as the concentration of target substance (diethyl phthalate) increased from 0.05 to 100 ng/mL, the method showed a good linear relationship. The fluorescence measurement signal and the color change signal of the solution visualization support each other and give the information of the corresponding material content. The results of the dual-optical immunoassay maintain good consistency, which proves the accuracy of the developed dual-optical immunoassay for detection of diethyl phthalate is reliable. Additionally, it is demonstrated that the dual-modal method exhibits high accuracy and stability in the assays, pointing to a broad range of application prospects in pollutant analysis.
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Affiliation(s)
- Biru Chen
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Key Laboratory of Chemo Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, Anhui, China; School of Life Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China
| | - Lei Li
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Key Laboratory of Chemo Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, Anhui, China
| | - Qianqian Yang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Key Laboratory of Chemo Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, Anhui, China
| | - Mingcui Zhang
- Key Laboratory of Functional Molecular Solids, Ministry of Education, Key Laboratory of Chemo Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241002, Anhui, China.
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Identifying an emergent adulterant hydrochlorothiazide in food: A simple lateral flow strip with high sensitivity by time-resolved fluorescence. Food Control 2022. [DOI: 10.1016/j.foodcont.2022.109265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Lin L, Xu X, Song S, Xu L, Wu X, Liu L, Kuang H, Xu C. A multiplex lateral flow immunochromatography assay for the quantitative detection of pyraclostrobin, myclobutanil, and kresoxim-methyl residues in wheat. Food Chem 2022; 377:131964. [PMID: 34999457 DOI: 10.1016/j.foodchem.2021.131964] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 12/17/2021] [Accepted: 12/25/2021] [Indexed: 11/04/2022]
Abstract
We produced three monoclonal antibodies with high specificity and sensitivity, and developed a lateral flow immunochromatography assay (LFIA) for the qualitative and quantitative detection of pyraclostrobin (PYR), myclobutanil (MYC), and kresoxim-methyl (KRE) in wheat. In the qualitative analysis, the cut-off values of LFIA were 400, 200, and 800 ng/g for PYR, MYC, and KRE in wheat, respectively. Based on the results obtained from the membrane strip reader, we generated calibration curves for the quantitative analysis. PYR, MYC, and KRE monoclonal antibodies (mAbs) had half maximal inhibitory concentrations (IC50) of 25.4, 17.7, and 94.6 ng/g, respectively, and limit of detection (LOD) of 2.5, 2.0, and 8.8 ng/g, respectively. The linear detection scopes were 5.6-116.5, 4.2-74.4, 23.4-383.3 ng/g for PYR, MYC, and KRE, respectively. The intra-assay recoveries ranged from 89.2% to 101.7%, and the coefficients of variation ranged from 4.6% to 6.5%. The inter-assay recoveries ranged from 88.7% to 102.7%, with the coefficients of variation ranged from 7.2% to 9.1%. Thus, our developed LFIA is suitable for the qualitative and quantitative detection of PYR, MYC, and KRE residues in wheat.
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Affiliation(s)
- Lu Lin
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Xinxin Xu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Shanshan Song
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Liguang Xu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Xiaoling Wu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Liqiang Liu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China.
| | - Hua Kuang
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China
| | - Chuanlai Xu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People's Republic of China.
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Development of Immunochromatographic Strip for Detection of αB-VxXXIVA-Conotoxin Based on 5E4 Monoclonal Antibody. Toxins (Basel) 2022; 14:toxins14030191. [PMID: 35324688 PMCID: PMC8953961 DOI: 10.3390/toxins14030191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/22/2022] [Accepted: 02/28/2022] [Indexed: 01/19/2023] Open
Abstract
Given the application of αB-VxXXIVA-conotoxin (αB-CTX) in analgesics and cancer chemotherapeutics, and its threat to humans, it is urgent to develop a rapid, effective and accurate method for the analysis and detection of αB-CTX in real shellfish and medicine drug samples. In the present study, two different immunochromatographic strips were established for αB-CTX detection, based on the monoclonal antibody 5E4 against αB-CTX, and the visual limits of detection (vLOD) for the colloidal gold nanoparticles-based strip (AuNPs-based strip) and nanoflowers-based strip (AuNFs-based strip) were 4 μg/mL and 1.5 μg/mL, respectively. The developed AuNPs-/AuNFs-based strips have good specificity and accuracy, and the detection results were analyzed in less than 10 min, without using an instrument. In view of the excellent repeatability and usability, the established methods could be applied to detect and analyze the content of αB-CTX in real samples.
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Detection of αB-Conotoxin VxXXIVA (αB-CTX) by ic-ELISA Based on an Epitope-Specific Monoclonal Antibody. Toxins (Basel) 2022; 14:toxins14030166. [PMID: 35324663 PMCID: PMC8949368 DOI: 10.3390/toxins14030166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Revised: 02/09/2022] [Accepted: 02/21/2022] [Indexed: 12/15/2022] Open
Abstract
In view of the toxicological hazard and important applications in analgesics and cancer chemotherapeutics of αB-CTX, it is urgent to develop an accurate, effective and feasible immunoassay for the determination and analysis of αB-CTX in real samples. In this study, MBP-αB-CTX4 tandem fusion protein was used as an immunogen to elicit a strong immune response, and a hybridoma cell 5E4 secreting IgG2b against αB-CTX was successfully screened by hybridoma technology. The affinity of the purified 5E4 monoclonal antibody (mAb) was 1.02 × 108 L/mol, which showed high affinity and specificity to αB-CTX. Epitope 1 of αB-CTX is the major binding region for 5E4 mAb recongnization, and two amino acid residues (14L and 15F) in αB-CTX were critical sites for the interaction between αB-CTX and 5E4 mAb. Indirect competitive ELISA (ic-ELISA) based on 5E4 mAb was developed to detect and analyze αB-CTX in real samples, and the linear range of ic-ELISA to αB-CTX was 117–3798 ng/mL, with a limit of detection (LOD) of 81 ng/mL. All the above results indicated that the developed ic-ELISA had high accuracy and repeatability, and it could be applied for αB-CTX detection and drug analysis in real samples.
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Xie H, Li Y, Wang J, Lei Y, Koidis A, Li X, Shen X, Xu Z, Lei H. Broad-specific immunochromatography for simultaneous detection of various sulfonylureas in adulterated multi-herbal tea. Food Chem 2022; 370:131055. [PMID: 34536782 DOI: 10.1016/j.foodchem.2021.131055] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 09/02/2021] [Accepted: 09/02/2021] [Indexed: 11/04/2022]
Abstract
Sulfonylureas (SUs) are a series of anti-diabetic drugs widely used for type 2 diabetes mellitus for clinic treat. However, it is often illegally adulterated in multi-herbal tea to improve the claimed anti-diabetic activity in recent years. In this study, a novel hapten was rationally designed, and a broad-specific monoclonal antibody (anti-SUs mAb) recognizing nine SUs was developed. This mAb was used to develop a colloidal gold lateral flow immunochromatographic assay (CG-LFIA). The anti-SUs mAb demonstrated half inhibitory concentration (IC50) ranged from 0.15 ng/mL to 3.25 ng/ mL for nine SUs by ELISA. The cut-off value of developed CG-LFIA for nine SUs was from 3 to 100 ng/ mL for the spiked samples. LC-MS/MS confirmed the reliability of the new CG-LFIA. The results indicated that the proposed CG-LFIA could be an ideal method in on-site screening surveillance assay for SUs illegally adulterated in multi-herbal tea products.
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Affiliation(s)
- Haihuan Xie
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Yingying Li
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Jin Wang
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Yi Lei
- Guangdong Institute of Food Inspection, Guangzhou 510435, China
| | - Anastasios Koidis
- Institute for Global Food Security, Queen's University Belfast, 19 Chlorine Gardens, Belfast BT9 5DJ, UK
| | - Xiangmei Li
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Xing Shen
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Zhenlin Xu
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China
| | - Hongtao Lei
- Guangdong Provincial Key Laboratory of Food Quality and Safety, College of Food Science, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China.
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Chen Q, Li H, Yang L, Wen S, Huang X, Liu J, Guo X, Hu B, Li G, He M. Preparation of an anti-NEK2 monoclonal antibody and its application in liver cancer. BMC Biotechnol 2021; 21:62. [PMID: 34706700 PMCID: PMC8549277 DOI: 10.1186/s12896-021-00717-3] [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: 03/15/2021] [Accepted: 09/22/2021] [Indexed: 12/12/2022] Open
Abstract
Background Never in mitosis gene-A (NIMA)-related expressed kinase 2 (NEK2) is a serine/threonine protein kinase regulated by the cell cycle. The purpose of this study was to obtain NEK2 protein to prepare an anti-NEK2 monoclonal antibody (mAb) and explore the application of the anti-NEK2 mAb of therapeutic and diagnostic in hepatocellular carcinoma (HCC). Results The NEK2 gene sequence was cloned from the normal liver cell line HL7702, and the full-length NEK2 gene sequence was cloned into the prokaryotic expression vector pET30a and transformed into Escherichia coli BL21 (DE3) cells. The recombinant fusion protein was obtained under optimized conditions and injected in BALB/c mice to prepare an anti-NEK2 mAb. By screening, we obtained a stable hybridoma cell line named 3A3 that could stably secrete anti-NEK2 mAb. Anti-NEK2 3A3 mAb was purified from ascites fluid. The isotype was IgG1, and the affinity constant (Kaff) was 6.0 × 108 L/mol. Western blot, indirect enzyme-linked immunosorbent assay (iELISA), immunofluorescence and immunocytochemical analyses showed that the mAb could specifically recognize the NEK2 protein. MTT assays showed that the mAb 3A3 could inhibit the proliferation of HCC cells. KEGG pathway analysis showed that NEK2 might affected pathways of the cell cycle. Moreover, NEK2-related genes were mainly enriched in the S and G2 phases and might act as tumor-promoting genes by regulating the S/G2 phase transition of HCC cells. Conclusions An anti-NEK2 mAb with high potency, high affinity and high specificity was prepared by prokaryotic expression system in this study and may be used in the establishment of ELISA detection kits and targeted treatment of liver cancer. Supplementary Information The online version contains supplementary material available at 10.1186/s12896-021-00717-3.
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Affiliation(s)
- Qiuli Chen
- School of Public Health, Guangxi Medical University, Nanning, 530021, China
| | - Hui Li
- School of Public Health, Guangxi Medical University, Nanning, 530021, China
| | - Lichao Yang
- School of Public Health, Guangxi Medical University, Nanning, 530021, China
| | - Sha Wen
- Laboratory Animal Center of Guangxi Medical University, Nanning, 530021, China
| | - Xuejing Huang
- Laboratory Animal Center of Guangxi Medical University, Nanning, 530021, China
| | - Jiajuan Liu
- Laboratory Animal Center of Guangxi Medical University, Nanning, 530021, China
| | - Xiaoping Guo
- Laboratory Animal Center of Guangxi Medical University, Nanning, 530021, China
| | - Bing Hu
- Laboratory Animal Center of Guangxi Medical University, Nanning, 530021, China
| | - Gang Li
- School of Public Health, Guangxi Medical University, Nanning, 530021, China.
| | - Min He
- School of Public Health, Guangxi Medical University, Nanning, 530021, China. .,Laboratory Animal Center of Guangxi Medical University, Nanning, 530021, China. .,Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, 530021, China.
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Wang R, Wang J, Liu H, Gao Y, Zhao Q, Ling S, Wang S. Sensitive immunoassays based on specific monoclonal IgG for determination of bovine lactoferrin in cow milk samples. Food Chem 2021; 338:127820. [PMID: 32827899 DOI: 10.1016/j.foodchem.2020.127820] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 07/31/2020] [Accepted: 08/09/2020] [Indexed: 02/03/2023]
Abstract
Lactoferrin (LF), a bioactive multifunctional protein of the transferrin family, is found mainly in the secretions of all mammals, especially in milk. In the present study, a hybridoma cell (LF8) secreting IgG against bovine LF was screened, and the purified LF8 mAb showed high specificity and affinity to bovine LF. The linear range of ic-ELISA to detect LF was 9.76 ~ 625 ng/mL, with a limit of detection (LOD) of 0.01 ng/mL. The average recovery of intra- and inter-assay were (104.45 ± 4.12)% and (107.13 ± 4.72)%, respectively. The LOD of colloidal gold- and AuNFs-based strip by naked eye were 9.7 and 2.4 ng/mL, respectively, and the detection time was less than 10 min without any samples pretreatment and expensive equipment. The developed ELISA and lateral flow immunosensors based on specific IgG could be used directly for rapid detection of the bovine LF content in cow milk samples.
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Affiliation(s)
- Rongzhi Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Juncheng Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Haimei Liu
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yehong Gao
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Qiang Zhao
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Sumei Ling
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Shihua Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Marine Biotechnology of Fujian Province, School of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
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Yang F, Xiao Y, Xu L, Liu F, Yao H, Wu N, Wu H. Development of an antigen-capture enzyme-linked immunosorbent assay and immunochromatographic strip based on monoclonal antibodies for detection of H6 avian influenza viruses. Arch Virol 2020; 165:1129-1139. [PMID: 32221715 DOI: 10.1007/s00705-020-04602-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2020] [Accepted: 02/28/2020] [Indexed: 10/24/2022]
Abstract
Continuous surveillance has shown that H6 subtype avian influenza viruses (AIVs) are prevalent in poultry and occasionally break the species barrier to infect humans. It is therefore necessary to establish a specific, rapid and sensitive method to screen H6 AIVs. In this study, a panel of monoclonal antibodies (mAbs) against the hemagglutinin (HA) of an H6 AIV isolate was produced. The purified mAbs have high affinity and specificity for H6 AIVs. An antigen-capture enzyme-linked immunosorbent assay (AC-ELISA) and immunochromatographic strip were developed based on two mAbs (1D7 and 1F12). The AC-ELISA results showed high sensitivity with a limit of detection (LOD) of 3.9 ng/ml for H6 HA protein and 0.5 HAU (HA units)/100 µl for live H6 subtype AIVs. The average recovery of the AC-ELISA with allantoic fluid, respiratory specimens, and cloacal swabs was 91.907 ± 1.559%, 82.977 ± 1.497% and 73.791 ± 2.588%, respectively. The intra- and inter-assay coefficient of variation was less than 10%. The LOD of immunochromatographic strip was 1 HAU when evaluated by the naked eye, and the detection time was less than 10 min without any equipment. Storage at room temperature or 4 °C for 30 days or 60 days had no effect on sensitivity and specificity of the strip. Thus, the AC-ELISA and immunochromatographic strips described here could be a secondary method to diagnose H6 AIV infections with high specificity, sensitivity, and stability.
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Affiliation(s)
- Fan Yang
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Yixin Xiao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Lihua Xu
- Animal Husbandry and Veterinary Institute, Zhejiang Academy of Agricultural Science, Hangzhou, 310021, China
| | - Fumin Liu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Hangping Yao
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Nanping Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China
| | - Haibo Wu
- State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, and National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, School of Medicine, Zhejiang University, 79 Qingchun Road, Hangzhou, 310003, Zhejiang, China.
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