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Tian W, Zhang Y, Geng S, Wang J, Ji W, Xu Y, Gao X, Li X, Lin L, Liu Y, Song C, Chen Z, Zhang W. Evaluation of reverse transcription loop-mediated isothermal amplification assay for the detection of severe fever with thrombocytopenia syndrome in clinical laboratories: A single-center study. J Med Virol 2023; 95:e29258. [PMID: 38054542 DOI: 10.1002/jmv.29258] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 10/09/2023] [Accepted: 11/12/2023] [Indexed: 12/07/2023]
Abstract
Severe fever with thrombocytopenia syndrome (SFTS) is an acute infectious disease prevalent in East Asia with a high mortality rate (5%-30%). Reverse transcription loop-mediated isothermal amplification (RT-LAMP), a rapid nucleic acid-based diagnostic technique, is a useful alternative for the clinical diagnosis of SFTS, particularly in resource-limited hospitals or rural clinics in SFTS virus-endemic regions. However, the actual clinical sensitivity and specificity of RT-LAMP remain unclear. This study evaluated the field application of RT-LAMP. This prospective field study included 130 patients with laboratory-confirmed SFTS from Yantai, Shandong Province, China. Two sets of RT-LAMP primers were validated, and one set of RT-LAMP assays was optimized for field detection. Nucleic acids of serially collected serum/plasma samples were identified using quantitative reverse transcription polymerase chain reaction (RT-qPCR) and RT-LAMP. In laboratory tests, we optimized the detection time of primer set 2 for the RT-LAMP to 60 min. Notably, the onsite testing of 279 plasma samples from patients with SFTS revealed that the sensitivity and specificity of the test were 81.9% and 96.3%, respectively. We also analyzed samples with different durations of the disease, and our study showed that the sensitivity of RT-LAMP detection at the beginning of admission was 89.92%. Univariate analysis showed that the detection rate of RT-LAMP was similar to that of RT-qPCR in the first 5 days of the disease course and was lower than that of RT-qPCR on Days 6 and 14-15 of the disease course. The positive detection rate in patients aged ≥ 65 years was significantly higher than that in younger age groups. RT-LAMP is a simple, suitable, and rapid clinical detection method of SFTS onsite screening. It is more suitable for screening patients in the early stages of the disease and analyzing samples obtained from patients aged ≥ 65 years before the 6th day of the disease course.
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Affiliation(s)
- Wen Tian
- Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Yuanyuan Zhang
- Beijing Key Laboratory of Emerging Infectious Diseases, Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Infectious Diseases, Beijing, China
- National Center for Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Shuying Geng
- Department of Infectious Diseases, Yantai City Hospital for Infectious Disease, Yantai, China
| | - Jianxin Wang
- Beijing Key Laboratory of Emerging Infectious Diseases, Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Infectious Diseases, Beijing, China
- National Center for Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Wenjuan Ji
- Department of Infectious Diseases, Yantai City Hospital for Infectious Disease, Yantai, China
| | - Yanli Xu
- Department of Infectious Diseases, Yantai City Hospital for Infectious Disease, Yantai, China
| | - Xu Gao
- Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Xin Li
- Center of Integrative Medicine, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Ling Lin
- Department of Infectious Diseases, Yantai City Hospital for Infectious Disease, Yantai, China
| | - Yuanni Liu
- Department of Infectious Diseases, Yantai City Hospital for Infectious Disease, Yantai, China
| | - Chuan Song
- Beijing Key Laboratory of Emerging Infectious Diseases, Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
- Beijing Institute of Infectious Diseases, Beijing, China
- National Center for Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Zhihai Chen
- Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Wei Zhang
- Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing, China
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Ai L, Wang W, Teng Z. Advancements in the Worldwide Detection of Severe Fever with Thrombocytopenia Syndrome Virus Infection from 2009 to 2023. China CDC Wkly 2023; 5:687-693. [PMID: 37593140 PMCID: PMC10427339 DOI: 10.46234/ccdcw2023.132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 08/01/2023] [Indexed: 08/19/2023] Open
Abstract
Severe fever with thrombocytopenia syndrome (SFTS) is a growing concern as an emerging tick-borne infectious disease originating from the SFTS virus (SFTSV), a recent addition to the Phlebovirus genus under the family of bunyaviruses. SFTS is typically identified by symptoms such as fever, thrombocytopenia, leukopenia, and gastrointestinal problems, accompanied by a potentially high case fatality rate. Thus, early and accurate diagnosis is essential for effective treatment and disease management. This review delves into the existing methodologies for SFTS detection, including pathogenic, molecular, and immunological technologies.
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Affiliation(s)
- Lin Ai
- Institute of Microbiology Laboratory, Shanghai Municipal Center for Disease Control and Prevention, Shanghai, China
| | - Wei Wang
- Institute of Microbiology Laboratory, Shanghai Institute of Preventive Medicine, Shanghai, China
| | - Zheng Teng
- Institute of Microbiology Laboratory, Shanghai Municipal Center for Disease Control and Prevention, Shanghai, China
- Institute of Microbiology Laboratory, Shanghai Institute of Preventive Medicine, Shanghai, China
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3
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Tian W, Ren X, Gao X, Zhang Y, Chen Z, Zhang W. Accuracy of reverse-transcription polymerase chain reaction and loop-mediated isothermal amplification in diagnosing severe fever with thrombocytopenia syndrome: A systematic review and meta-analysis. J Med Virol 2022; 94:5922-5932. [PMID: 35968756 PMCID: PMC9804528 DOI: 10.1002/jmv.28068] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 07/27/2022] [Accepted: 08/10/2022] [Indexed: 01/06/2023]
Abstract
Nucleic acid molecular diagnostic technology plays an important role in the detection of severe fever with thrombocytopenia syndrome (SFTS). However, no relevant reports have been published on the accuracy of reverse-transcription polymerase chain reaction (RT-PCR) and reverse-transcription loop-mediated isothermal amplification (RT-LAMP) in the diagnosis of SFTS. Thus, we conducted a meta-analysis and systematic review to evaluate the accuracy of the two methods. On June 19, 2022, we comprehensively searched the PubMed, Embase, Cochrane Library, Web of Science, Scoups, Ovid, Proquest, China National Knowledge Infrastructure Database, Wan Fang Data, Traditional Chinese Medicine Database (Sinomed), VIP Database, and Reading Showing Database for articles on nucleic acid diagnostic techniques, such as RT-PCR and RT-LAMP, used to diagnose SFTS. Statistical analysis was performed using STATA 14.0 and Meta-Disc 1.4. Sixteen articles involving 2942 clinical blood samples were included in the analysis. RT-PCR and RT-LAMP were used as index tests, whereas RT-PCR or other detection methods were used as reference standards. The pooled values for the sensitivity, specificity, positive and negative likelihood ratios of the RT-PCR test were 0.97 (95% confidence interval [CI]: 0.92-0.99), 1.00 (95% CI: 0.98-1.00), 483.87 (95% CI: 58.04-4033.76), and 0.03 (95% CI:0.01-0.08), respectively. Those for the RT-LAMP test were 0.95 (95% CI: 0.91-0.97), 0.99 (95% CI: 0.93-1.00), 111.18 (95% CI: 13.96-885.27), and 0.05 (95% CI: 0.03-0.09), respectively. Both RT-PCR and RT-LAMP have high diagnostic value in SFTS and can be applied in different scenarios for laboratory confirmation or on-site screening.
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Affiliation(s)
- Wen Tian
- Center of Infectious Diseases, Beijing Ditan HospitalCapital Medical UniversityBeijingChina
| | - Xingxiang Ren
- Center of Infectious Diseases, Beijing Ditan HospitalCapital Medical UniversityBeijingChina
| | - Xu Gao
- Center of Infectious Diseases, Beijing Ditan HospitalCapital Medical UniversityBeijingChina
| | - Yuanyuan Zhang
- Beijing Key Laboratory of Emerging Infectious Disease, Beijing Ditan HospitalCaptital Medical UniversityBeijingChina
| | - Zhihai Chen
- Center of Infectious Diseases, Beijing Ditan HospitalCapital Medical UniversityBeijingChina
| | - Wei Zhang
- Center of Infectious Diseases, Beijing Ditan HospitalCapital Medical UniversityBeijingChina
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4
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Xue Y, Kong Q, Ding H, Xie C, Zheng B, Zhuo X, Ding J, Tong Q, Lou D, Lu S, Lv H. A novel loop-mediated isothermal amplification-lateral-flow-dipstick (LAMP-LFD) device for rapid detection of Toxoplasma gondii in the blood of stray cats and dogs. ACTA ACUST UNITED AC 2021; 28:41. [PMID: 33944774 PMCID: PMC8095094 DOI: 10.1051/parasite/2021039] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 04/18/2021] [Indexed: 11/14/2022]
Abstract
Toxoplasma gondii is an obligate intracellular protozoan parasite that causes toxoplasmosis and threatens warm-blooded animal and human health worldwide. Simple and applicable diagnostic methods are urgently needed to guide development of effective approaches for prevention of toxoplasmosis. Most molecular diagnostic tools for T. gondii infection require high technical skills, sophisticated equipment, and a controlled lab environment. In this study, we developed a loop-mediated isothermal amplification-lateral-flow-dipstick (LAMP-LFD) assay that specifically targets the 529 bp for detecting T. gondii infection. This novel portable device is universal, fast, user-friendly, and guarantees experimental sensitivity as well as low risk of aerosol contamination. Our LAMP-LFD assay has a detection limit of 1 fg of T. gondii DNA, and shows no cross-reaction with other parasitic pathogens, including Cryptosporidium parvum, Leishmania donovani, and Plasmodium vivax. We validated the developed assay by detecting T. gondii in DNA extracted from blood samples collected from 318 stray cats and dogs sampled from Deqing, Wenzhou, Yiwu, Lishui and Zhoushan cities across Zhejiang province, Eastern China. The LAMP-LFD device detected T. gondii DNA in 4.76 and 4.69% of stray cats and dogs, respectively. In conclusion, the developed LAMP-LFD assay is efficient, minimizes aerosol contamination, and is therefore suitable for detecting T. gondii across basic medical institutions and field settings.
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Affiliation(s)
- Yangji Xue
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Qingming Kong
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Haojie Ding
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Chengzuo Xie
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Bin Zheng
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Xunhui Zhuo
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Jianzu Ding
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Qunbo Tong
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Di Lou
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Shaohong Lu
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
| | - Hangjun Lv
- Department of Immunity and Biochemistry, Institute of Parasitic Disease, Zhejiang Academy of Medical Sciences 310013 Hangzhou PR China - Hangzhou Medical College 310053 Hangzhou PR China
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Sano S, Fukushi S, Yamada S, Harada S, Kinoshita H, Sugimoto S, Yoshikawa T, Kurosu T, Takamatsu Y, Shimojima M, Toda S, Hamada Y, Fujisawa N, Sugimoto T, Saijo M. Development of an RT-LAMP Assay for the Rapid Detection of SFTS Virus. Viruses 2021; 13:v13040693. [PMID: 33923720 PMCID: PMC8073756 DOI: 10.3390/v13040693] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/12/2021] [Accepted: 04/14/2021] [Indexed: 11/16/2022] Open
Abstract
Detection of severe fever with thrombocytopenia syndrome (SFTS) virus (SFTSV) during the early phase of the disease is important for appropriate treatment, infection control, and prevention of further transmission. The reverse transcription loop-mediated isothermal amplification (RT-LAMP) is a nucleic acid amplification method that amplifies the target sequence under isothermal conditions. Here, we developed an RT-LAMP with a novel primer/probe set targeting a conserved region of the SFTSV L segment after extraction of viral RNA (standard RT-LAMP). Both the Chinese and Japanese SFTSV strains, including various genotypes, were detected by the standard RT-LAMP. We also performed RT-LAMP using the same primer/probe set but without the viral RNA extraction step (called simplified RT-LAMP) and evaluated the diagnostic efficacy. The sensitivity and specificity of the simplified RT-LAMP were 84.9% (45/53) and 89.5% (2/19), respectively. The simplified RT-LAMP can detect SFTSV in human sera containing >103.5 copies/mL viral RNA. The two RT-LAMP positive but quantitative real-time reverse transcription-polymerase chain reaction (RT-PCR) negative samples were positive in the conventional RT-PCR, suggesting that there was no false positive reaction in the RT-LAMP. Both the standard and simplified RT-LAMP are useful for detecting the SFTSV genome in patients during the early phase of the disease.
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Affiliation(s)
- Shiori Sano
- Eiken Chemical Co., Ltd., 4-19-9 Taito, Taito-ku, Tokyo 110-8408, Japan;
| | - Shuetsu Fukushi
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
- Correspondence: ; Tel.: +81-3-5285-1111; Fax: +81-3-5285-1180
| | - Souichi Yamada
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Shizuko Harada
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Hitomi Kinoshita
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Satoko Sugimoto
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Tomoki Yoshikawa
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Takeshi Kurosu
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Yuki Takamatsu
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Masayuki Shimojima
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
| | - Shoichi Toda
- Yamaguchi Prefectural Institute of Public Health and Environment, 2-5-67 Aoi Yamaguchi, Yamaguchi 753-0821, Japan;
| | - Yuka Hamada
- Kagoshima Prefectural Institute for Environmental Research and Public Health, 11-40, Kinko-cho, Kagoshima City, Kagoshima 892-0836, Japan;
| | - Naoki Fujisawa
- Shimane Prefectural Institute of Public Health and Environmental Science, 582-1, Nishihamasada-cho, Matsue, Shimane 690-0122, Japan;
| | - Takayuki Sugimoto
- Miyazaki Prefectural Institute for Public Health and Environment, 2-3-2, Gakuenkibanadainishi, Miyazaki City, Miyazaki 889-2155, Japan;
| | - Masayuki Saijo
- Department of Virology 1, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku, Tokyo 162-8640, Japan; (S.Y.); (S.H.); (H.K.); (S.S.); (T.Y.); (T.K.); (Y.T.); shimoji-@nih.go.jp (M.S.); (M.S.)
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6
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Yoo IY, Kim JY, Yoon YK, Huh HJ, Lee NY. Comparison Between the SFTS-QS Kit and the PowerChek SFTSV Real-time PCR Kit for the Detection of Severe Fever With Thrombocytopenia Syndrome Virus. Ann Lab Med 2020; 40:317-320. [PMID: 32067431 PMCID: PMC7054697 DOI: 10.3343/alm.2020.40.4.317] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/17/2019] [Accepted: 01/15/2020] [Indexed: 12/20/2022] Open
Abstract
The recent increase in severe fever with thrombocytopenia syndrome (SFTS) cases has led to the development of the SFTS-QS kit (MiCoBioMed, Seongnam, Korea) for detecting the SFTS virus (SFTSV, now renamed Huaiyangshan banyangvirus). SFTS-QS is a qualitative real-time reverse transcription PCR assay based on lab-on-a-chip technology. We evaluated the performance of the SFTS-QS kit and compared it with that of the PowerChek SFTSV Real-time PCR kit (PowerChek; Kogene Biotech, Seoul, Korea). A total of 117 serum samples were simultaneously assayed using the SFTS-QS and PowerChek kits. Sanger sequencing targeting the S and M segments of SFTSV was performed as the reference method. The total turnaround time of the two kits was compared. The SFTS-QS results agreed with those of PowerChek with a kappa value of 0.92. The diagnostic sensitivity and specificity of the SFTS-QS kit were both 100% (14/14 and 103/103, respectively), whereas those of the PowerChek kit were 100% (14/14) and 98.1% (101/103), respectively. The results of SFTS-QS and PowerChek were comparable; however, the SFTS-QS kit required a shorter total turnaround time. The SFTS-QS kit produced accurate and fast results and thus could serve as a useful tool for detecting SFTSV.
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Affiliation(s)
- In Young Yoo
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Ji Youn Kim
- Center for Clinical Medicine, Samsung Biomedical Research Institute, Samsung Medical Center, Seoul, Korea
| | - Young Kyung Yoon
- Division of Infectious Diseases, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.,Institute of Emerging Infectious Diseases, Korea University College of Medicine, Seoul, Korea
| | - Hee Jae Huh
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
| | - Nam Yong Lee
- Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Baseline mapping of severe fever with thrombocytopenia syndrome virology, epidemiology and vaccine research and development. NPJ Vaccines 2020; 5:111. [PMID: 33335100 PMCID: PMC7746727 DOI: 10.1038/s41541-020-00257-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 10/13/2020] [Indexed: 12/13/2022] Open
Abstract
Severe fever with thrombocytopenia syndrome virus (SFTSV) is a newly emergent tick-borne bunyavirus first discovered in 2009 in China. SFTSV is a growing public health problem that may become more prominent owing to multiple competent tick-vectors and the expansion of human populations in areas where the vectors are found. Although tick-vectors of SFTSV are found in a wide geographic area, SFTS cases have only been reported from China, South Korea, Vietnam, and Japan. Patients with SFTS often present with high fever, leukopenia, and thrombocytopenia, and in some cases, symptoms can progress to severe outcomes, including hemorrhagic disease. Reported SFTSV case fatality rates range from ~5 to >30% depending on the region surveyed, with more severe disease reported in older individuals. Currently, treatment options for this viral infection remain mostly supportive as there are no licensed vaccines available and research is in the discovery stage. Animal models for SFTSV appear to recapitulate many facets of human disease, although none of the models mirror all clinical manifestations. There are insufficient data available on basic immunologic responses, the immune correlate(s) of protection, and the determinants of severe disease by SFTSV and related viruses. Many aspects of SFTSV virology and epidemiology are not fully understood, including a detailed understanding of the annual numbers of cases and the vertebrate host of the virus, so additional research on this disease is essential towards the development of vaccines and therapeutics.
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Umeki K, Yasuda A, Umekita K, Megumi R, Nomura H, Kawaguchi T, Matsuda M, Takajo I, Shimojima M, Okayama A. Detection of anti-SFTSV nuclear protein antibody in the acute phase sera of patients using double-antigen ELISA and immunochromatography. J Virol Methods 2020; 285:113942. [PMID: 32781007 DOI: 10.1016/j.jviromet.2020.113942] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Revised: 07/14/2020] [Accepted: 07/17/2020] [Indexed: 11/28/2022]
Abstract
Severe fever with thrombocytopenia syndrome (SFTS) is a life-threatening febrile illness that is caused by the SFTS virus (SFTSV). The diagnosis of SFTS is usually performed by detecting viral RNA. However, it has been reported that viral RNA is no longer detectable at 6-12 days after the onset of disease. In the current study, we have constructed a plasmid to express the recombinant nuclear protein (NP) based on the Japanese strain of SFTSV (J1). We developed a double-antigen enzyme-linked immunosorbent assay (ELISA) and immunochromatography (IC) assay using recombinant NP to detect antibody against SFTSV-NP. When we tested time-sequential samples from four patients with SFTS, antibody to SFTSV-NP were detectable not only during the recovery phase (days 10-622) but also during the acute phase (days 4-7) of the disease using both of a double-antigen ELISA and IC assay. SFTSV-RNA was detected until 8-11 days after onset, thus suggesting the coexistence of the virus and antibody during the acute phase of SFTS. These data suggest that assays for detecting antibody against SFTS-NP described in the current study may be applicable not only for the epidemiological studies but also for the diagnosis of SFTS.
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Affiliation(s)
- Kazumi Umeki
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; Department of Medical Life Science, Faculty of Medical Bioscience, Kyushu University of Health and Welfare, Yoshino-cho 1714-1, Nobeoka, Miyazaki, 882-8508, Japan
| | - Asato Yasuda
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan; Miyazaki Prefectural Institute for Public Health and Environment, Nishi 2-3-2 Gakuenkibanadai, Miyazaki 889-2155, Japan
| | - Kunihiko Umekita
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Ryoya Megumi
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Hajime Nomura
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Takeshi Kawaguchi
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Motohiro Matsuda
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Ichiro Takajo
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan
| | - Masayuki Shimojima
- Department of Virology I, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayama, Tokyo 208-0011, Japan
| | - Akihiko Okayama
- Department of Rheumatology, Infectious Diseases and Laboratory Medicine, Faculty of Medicine, University of Miyazaki, Miyazaki 889-1692, Japan.
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9
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Development and evaluation of a rapid detection assay for severe fever with thrombocytopenia syndrome virus based on reverse-transcription recombinase polymerase amplification. Mol Cell Probes 2020; 52:101580. [PMID: 32330556 PMCID: PMC7172814 DOI: 10.1016/j.mcp.2020.101580] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/06/2020] [Accepted: 04/18/2020] [Indexed: 12/03/2022]
Abstract
Rapid detection of severe fever with thrombocytopenia syndrome virus (SFTSV) is crucial for its control and surveillance. In this study, a rapid isothermal real-time reverse-transcription recombinase polymerase amplification (RT-RPA) assay was developed for the detection of SFTSV. The detection limit at 95% probability was 241 copies per reaction. A test of 120 serum samples of suspected severe fever with thrombocytopenia syndrome (SFTS) patients revealed that the sensitivity and specificity of the RT-RPA assay was approximately 96.00% (95%CI: 80.46%–99.79%) and 98.95% (95% CI: 94.28%–99.95%), respectively; the kappa value was 0.9495 (P<0.001). The Bland-Altman analysis showed that 87.50% of the different data points were located within the 95% limits of agreement, indicating a good correlation between the results from RT-RPA assays and those of RT-qPCR assays. In conclusion, the rapid and efficient RT-RPA assay can be a promising candidate for point-of-care detection method of SFTSV. A RT-RPA assay was developed to detect SFTSV RNA isothermally. The assay can rapidly produce a result in 15 min at 39 °C. The detection limit of the assay is 241 RNA sequences. The results of RT-RPA compare well with RT-qPCR. The RT-RPA assay may be used for field detection of SFTSV in resource-limited settings.
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Yuan XY, Wang YL, Meng K, Zhang YX, Xu HY, Ai W. LAMP real-time turbidity detection for fowl adenovirus. BMC Vet Res 2019; 15:256. [PMID: 31337397 PMCID: PMC6651964 DOI: 10.1186/s12917-019-2015-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 07/18/2019] [Indexed: 11/16/2022] Open
Abstract
Background Fowl adenovirus (FAdV) is an infectious agent that can cause jaundice, severe anaemia, dyspnoea and reproductive disorders in fowls. Since 2015, FAdV disease has been rapidly spreading among broiler chickens in China, where it has caused significant economic losses. In this study, a loop-mediated isothermal amplification (LAMP) real-time turbidity method with strong specificity to FAdV was established. Results The established assay was specific to FAdV-4, and the lower limit of detection was 75 copies/μL of extracted DNA. The positive detection rate for the suspected tissue samples was 33.3% (14/42), which was consistent with that of the real-time PCR. Conclusion The proposed LAMP method can quickly and accurately detect prevalent FAdV via real-time turbidity assay, thereby providing a diagnostic platform for the prevention and control of the FAdV disease.
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Affiliation(s)
- Xiao-Yuan Yuan
- Poultry Institute, Shandong Academy of Agricultural Sciences; Shandong Provincial Key Laboratory of Poultry Diseases Diagnosis and Immunology; Poultry Breeding Engineering Technology Center of Shandong Province, Ji'nan, China.
| | - You-Ling Wang
- Poultry Institute, Shandong Academy of Agricultural Sciences; Shandong Provincial Key Laboratory of Poultry Diseases Diagnosis and Immunology; Poultry Breeding Engineering Technology Center of Shandong Province, Ji'nan, China.
| | - Kai Meng
- Poultry Institute, Shandong Academy of Agricultural Sciences; Shandong Provincial Key Laboratory of Poultry Diseases Diagnosis and Immunology; Poultry Breeding Engineering Technology Center of Shandong Province, Ji'nan, China
| | - Yu-Xia Zhang
- Poultry Institute, Shandong Academy of Agricultural Sciences; Shandong Provincial Key Laboratory of Poultry Diseases Diagnosis and Immunology; Poultry Breeding Engineering Technology Center of Shandong Province, Ji'nan, China
| | - Huai-Ying Xu
- Poultry Institute, Shandong Academy of Agricultural Sciences; Shandong Provincial Key Laboratory of Poultry Diseases Diagnosis and Immunology; Poultry Breeding Engineering Technology Center of Shandong Province, Ji'nan, China
| | - Wu Ai
- Poultry Institute, Shandong Academy of Agricultural Sciences; Shandong Provincial Key Laboratory of Poultry Diseases Diagnosis and Immunology; Poultry Breeding Engineering Technology Center of Shandong Province, Ji'nan, China
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Mason MG, Botella JR. A simple, robust and equipment-free DNA amplification readout in less than 30 seconds. RSC Adv 2019; 9:24440-24450. [PMID: 35527854 PMCID: PMC9069613 DOI: 10.1039/c9ra04725e] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 07/29/2019] [Indexed: 11/21/2022] Open
Abstract
Molecular based diagnostic methods rely on the amplification of pathogen DNA but naked eye visualization of results is still challenging. We present here a simple and highly reliable DNA amplification readout system for naked eye detection of isothermally or PCR amplified DNA in less than 30 seconds. This system utilizes spermine to precipitate DNA amplicons and initiate bridging flocculation of a mix of charcoal and diatomaceous earth particles in suspension. In the absence of amplification, the charcoal particles remain suspended resulting in a black, non-transparent colloid solution while positive samples in which DNA amplification has occurred can be identified within seconds as the particles flocculate and settle leaving a transparent liquid phase. We have coupled this method with our rapid dipstick DNA purification method and isothermal DNA amplification to create a simple four-step diagnostic system that can be preassembled to reduce unnecessary manipulation in the field. The method's simplicity, low cost, minimal equipment and clear presence/absence readout makes it ideal for rapid diagnostic testing in the laboratory and in situations where users have limited technical training or resources including high school science classes and field-based research. A simple and highly reliable DNA amplification readout system for naked eye detection of amplified DNA in under 30 seconds.![]()
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Affiliation(s)
- Michael Glenn Mason
- Plant Genetic Engineering Laboratory
- School of Agriculture and Food Sciences
- The University of Queensland
- St. Lucia
- Australia
| | - José Ramón Botella
- Plant Genetic Engineering Laboratory
- School of Agriculture and Food Sciences
- The University of Queensland
- St. Lucia
- Australia
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12
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Choe JY, Han HS, Lee SD, Lee H, Lee DE, Ahn JY, Ryoo HW, Seo KS, Kim JK. A comparative study of three different gene expression analysis methods. Technol Health Care 2018; 25:1073-1080. [PMID: 28854526 DOI: 10.3233/thc-170967] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND TNF-α regulates immune cells and acts as an endogenous pyrogen. Reverse transcription polymerase chain reaction (RT-PCR) is one of the most commonly used methods for gene expression analysis. Among the alternatives to PCR, loop-mediated isothermal amplification (LAMP) shows good potential in terms of specificity and sensitivity. OBJECTIVE However, few studies have compared RT-PCR and LAMP for human gene expression analysis. Therefore, in the present study, we compared one-step RT-PCR, two-step RT-LAMP and one-step RT-LAMP for human gene expression analysis. METHODS We compared three gene expression analysis methods using the human TNF-α gene as a biomarker from peripheral blood cells. Total RNA from the three selected febrile patients were subjected to the three different methods of gene expression analysis. RESULTS In the comparison of three gene expression analysis methods, the detection limit of both one-step RT-PCR and one-step RT-LAMP were the same, while that of two-step RT-LAMP was inferior. One-step RT-LAMP takes less time, and the experimental result is easy to determine. CONCLUSIONS One-step RT-LAMP is a potentially useful and complementary tool that is fast and reasonably sensitive. In addition, one-step RT-LAMP could be useful in environments lacking specialized equipment or expertise.
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Affiliation(s)
- Jae Young Choe
- Department of Pediatrics, Kyungpook National University School of Medicine, Daegu, Korea
| | - Hyung Soo Han
- Department of Physiology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Seon Duk Lee
- Department of Physiology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Hanna Lee
- Department of Physiology, Kyungpook National University School of Medicine, Daegu, Korea
| | - Dong Eun Lee
- Department of Emergency Medicine, Kyungpook National University School of Medicine, Daegu, Korea
| | - Jae Yun Ahn
- Department of Emergency Medicine, Kyungpook National University School of Medicine, Daegu, Korea
| | - Hyun Wook Ryoo
- Department of Emergency Medicine, Kyungpook National University School of Medicine, Daegu, Korea
| | - Kang Suk Seo
- Department of Emergency Medicine, Kyungpook National University School of Medicine, Daegu, Korea
| | - Jong Kun Kim
- Department of Emergency Medicine, Kyungpook National University School of Medicine, Daegu, Korea
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DNA detection of Trypanosoma evansi: Diagnostic validity of a new assay based on loop-mediated isothermal amplification (LAMP). Vet Parasitol 2017; 250:1-6. [PMID: 29329617 DOI: 10.1016/j.vetpar.2017.12.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Revised: 11/23/2017] [Accepted: 12/04/2017] [Indexed: 12/17/2022]
Abstract
Trypanosoma evansi (T. evansi) is the most widely spread pathogenic trypanosome in the world. The control of trypanosomiasis depends on accurate diagnosis and effective treatment. Focusing on the presence of T. evansi in Asia, we developed a detection assay based on tracing phosphate ions (Pi) generated during LAMP targeting the variant surface glycoprotein (VSG) gene of Rode Trypanozoon antigenic type 1.2 (RoTat 1.2 VSG). The diagnostic potential as well as the use of the assay as a test-of-cure method after berenil treatment, was assessed in mice at different time points of infection. In addition, 67 buffalo blood collected from Tongling county, Anhui province, as well as 42 cattle sera from the Shanghai area, were used to evaluate the diagnostic validity of the test. The detection limit of the novel LAMP assay was determined to be as low as 1 fg of T. evansi DNA, while the reaction time for the test was only 30min. Hence it outperforms both microscopy and PCR. In the test-of-cure assessment, successful berenil mediated cure could be confirmed within 48h after treatment. This offers a tremendous advantage over conventional antibody-based diagnostic tools in which successful cure only can be confirmed after months. In the cattle and buffalo screening, the LAMP was able to detect a false-negative determined sample, wrongly classified in a conventional microscopy and PCR screening. Finally, no cross-reactivity was observed with other zoonotic parasites, such as T. evansi type B, T. congolense, T. brucei, Schistosoma japonicum, Plasmodium falciparum, Leishmania donovani, Toxoplasma gondii and Angiostrongylus cantonensis. We conclude that the novel LAMP assay is sensitive, specific and convenient for field use, particularly in areas where infection incidence has become extremely low. The LAMP assay could be used as a tool for trypanosomiasis control and elimination strategies in areas where T. evansi Type A infections are causing a threat to livestock farming.
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Oloniniyi OK, Kurosaki Y, Miyamoto H, Takada A, Yasuda J. Rapid detection of all known ebolavirus species by reverse transcription-loop-mediated isothermal amplification (RT-LAMP). J Virol Methods 2017; 246:8-14. [PMID: 28356221 DOI: 10.1016/j.jviromet.2017.03.011] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 03/22/2017] [Accepted: 03/24/2017] [Indexed: 11/26/2022]
Abstract
Ebola virus disease (EVD), a highly virulent infectious disease caused by ebolaviruses, has a fatality rate of 25-90%. Without a licensed chemotherapeutic agent or vaccine for the treatment and prevention of EVD, control of outbreaks requires accurate and rapid diagnosis of cases. In this study, five sets of six oligonucleotide primers targeting the nucleoprotein gene were designed for specific identification of each of the five ebolavirus species using reverse transcription-loop mediated isothermal amplification (RT-LAMP) assay. The detection limits of the ebolavirus species-specific primer sets were evaluated using in vitro transcribed RNAs. The detection limit of species-specific RT-LAMP assays for Zaire ebolavirus, Sudan ebolavirus, Taï Forest ebolavirus, and Bundibugyo ebolavirus was 256 copies/reaction, while the detection limit for Reston ebolavirus was 64 copies/reaction, and the detection time for each of the RT-LAMP assays was 13.3±3.0, 19.8±4.6, 14.3±0.6, 16.1±4.7, and 19.8±2.4min (mean±SD), respectively. The sensitivity of the species-specific RT-LAMP assays were similar to that of the established RT-PCR and quantitative RT-PCR assays for diagnosis of EVD and are suitable for field or point-of-care diagnosis. The RT-LAMP assays were specific for the detection of the respective species of ebolavirus with no cross reaction with other species of ebolavirus and other viral hemorrhagic fever viruses such as Marburg virus, Lassa fever virus, and Dengue virus. The species-specific RT-LAMP assays developed in this study are rapid, sensitive, and specific and could be useful in case of an EVD outbreak.
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Affiliation(s)
- Olamide K Oloniniyi
- Department of Emerging Infectious Diseases, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan; Graduate School of Biomedical Sciences and Program for Nurturing Global Leaders in Tropical and Emerging Communicable Diseases, Nagasaki University, Nagasaki, Japan.
| | - Yohei Kurosaki
- Department of Emerging Infectious Diseases, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan.
| | - Hiroko Miyamoto
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan.
| | - Ayato Takada
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan; Global station for Zoonosis Control, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Japan.
| | - Jiro Yasuda
- Department of Emerging Infectious Diseases, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan; Graduate School of Biomedical Sciences and Program for Nurturing Global Leaders in Tropical and Emerging Communicable Diseases, Nagasaki University, Nagasaki, Japan.
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15
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Racsa LD, Kraft CS, Olinger GG, Hensley LE. Viral Hemorrhagic Fever Diagnostics. Clin Infect Dis 2015; 62:214-9. [PMID: 26354968 DOI: 10.1093/cid/civ792] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Accepted: 08/26/2015] [Indexed: 11/12/2022] Open
Abstract
There are 4 families of viruses that cause viral hemorrhagic fever (VHF), including Filoviridae. Ebola virus is one virus within the family Filoviridae and the cause of the current outbreak of VHF in West Africa. VHF-endemic areas are found throughout the world, yet traditional diagnosis of VHF has been performed in large reference laboratories centered in Europe and the United States. The large amount of capital needed, as well as highly trained and skilled personnel, has limited the availability of diagnostics in endemic areas except in conjunction with governmental and nongovernmental entities. However, rapid diagnosis of VHF is essential to efforts that will limit outbreaks. In addition, increased global travel suggests VHF diagnoses may be made outside of the endemic areas. Thus, understanding how to diagnose VHF is imperative for laboratories worldwide. This article reviews traditional and current diagnostic modalities for VHF.
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Affiliation(s)
- Lori D Racsa
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia
| | - Colleen S Kraft
- Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia
| | - Gene G Olinger
- Division of Clinical Research, National Institute of Allergy and Infectious Diseases, Integrated Research Facility, Frederick, Maryland
| | - Lisa E Hensley
- Division of Clinical Research, National Institute of Allergy and Infectious Diseases, Integrated Research Facility, Frederick, Maryland
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Yu F, Du Y, Huang X, Ma H, Xu B, Adungo F, Hayasaka D, Buerano CC, Morita K. Application of recombinant severe fever with thrombocytopenia syndrome virus nucleocapsid protein for the detection of SFTSV-specific human IgG and IgM antibodies by indirect ELISA. Virol J 2015; 12:117. [PMID: 26239826 PMCID: PMC4524020 DOI: 10.1186/s12985-015-0350-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 07/27/2015] [Indexed: 11/15/2022] Open
Abstract
Background Severe fever with thrombocytopenia syndrome (SFTS) is an emerging disease that was first reported in China in 2011. It is caused by SFTS virus (SFTSV) which is a member of the Phlebovirus genus in the Bunyaviridae family. SFTSV has been classified as a BSL3 pathogen. There is a need to develop safe and affordable serodiagnostic methods for proper clinical management of infected patients. Methods The full length nucleocapsid (N) gene of SFTSV Yamaguchi strain was amplified by RT-PCR and cloned to an expression vector pQE30. The recombinant (r) SFTSV-N protein was expressed by using Escherichia coli (E. coli) expression system and purified under native conditions. rSFTSV-N protein based indirect IgG and IgM enzyme linked immunosorbent assay (ELISA) systems were established to detect specific human IgG and IgM antibodies, respectively. One hundred fifteen serum samples from clinically suspected-SFTS patients were used to evaluate the newly established systems and the results were compared with the total antibody detecting sandwich ELISA system. Results The native form of recombinant (r) SFTSV-N protein was expressed and purified. Application of the rSFTSV-N protein based indirect IgG ELISA to the 115 serum samples showed results that perfectly matched those of the total antibody sandwich ELISA with a sensitivity and specificity of 100 %. The rSFTSV-N protein based indirect IgM ELISA missed 8 positive samples that were detected by the total antibody sandwich ELISA. The sensitivity and specificity of rSFTSV-N-IgM capture ELISA were 90.59 and 100 %, respectively. Conclusions The rSFTSV-N protein is highly immunoreactive and a good target for use as an assay antigen in laboratory diagnosis. Its preparation is simpler in comparison with that used for the total antibody sandwich system. Our rSFTSV-N protein-based IgG and IgM ELISA systems have the advantage of distinguishing two types of antibodies and require small volume of serum sample only. They are safe to use for diagnosis of SFTS virus infection and especially fit in large-scale epidemiological investigations.
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Affiliation(s)
- Fuxun Yu
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12- 4, Sakamoto, Nagasaki, 852-8523, Japan.
| | - Yanhua Du
- Henan Center for Disease Control and Prevention, Zhengzhou, China.
| | - Xueyong Huang
- Henan Center for Disease Control and Prevention, Zhengzhou, China.
| | - Hong Ma
- Henan Center for Disease Control and Prevention, Zhengzhou, China.
| | - Bianli Xu
- Henan Center for Disease Control and Prevention, Zhengzhou, China.
| | - Ferdinard Adungo
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12- 4, Sakamoto, Nagasaki, 852-8523, Japan.
| | - Daisuke Hayasaka
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12- 4, Sakamoto, Nagasaki, 852-8523, Japan.
| | - Corazon C Buerano
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12- 4, Sakamoto, Nagasaki, 852-8523, Japan.
| | - Kouichi Morita
- Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12- 4, Sakamoto, Nagasaki, 852-8523, Japan.
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Xia Y, Guo XG, Zhou S. Rapid detection of Streptococcus pneumoniae by real-time fluorescence loop-mediated isothermal amplification. J Thorac Dis 2014; 6:1193-9. [PMID: 25276360 DOI: 10.3978/j.issn.2072-1439.2014.07.29] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Accepted: 06/24/2014] [Indexed: 11/14/2022]
Abstract
BACKGROUND AND AIM OF STUDY A significant human pathogenic bacterium, Streptococcus pneumoniae was recognized as a major cause of pneumonia, and is the subject of many humoral immunity studies. Diagnosis is generally made based on clinical suspicion along with a positive culture from a sample from virtually any place in the body. But the testing time is too long. This study is to establish a rapid diagnostic method to identification of Streptococcus pneumoniae. METHODS Our laboratory has recently developed a new platform called real-amp, which combines loop-mediated isothermal amplification (LAMP) with a portable tube scanner real-time isothermal instrument for the rapid detection of Streptococcus pneumonia. Two pairs of amplification primers required for this method were derived from a conserved DNA sequence unique to the Streptococcus pneumoniae. The amplification was carried out at 63 degree Celsius using SYBR Green for 60 minutes with the tube scanner set to collect fluorescence signals. Clinical samples of Streptococcus pneumoniae and other bacteria were used to determine the sensitivity and specificity of the primers by comparing with traditional culture method. RESULTS The new set of primers consistently detected in laboratory-maintained isolates of Streptococcus pneumoniae from our hospital. The new primers also proved to be more sensitive than the published species-specific primers specifically developed for the LAMP method in detecting Streptococcus pneumoniae. CONCLUSIONS This study demonstrates that the Streptococcus pneumoniae LAMP primers developed here have the ability to accurately detect Streptococcus pneumoniae infections by real-time fluorescence LAMP.
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Affiliation(s)
- Yong Xia
- 1 Department of Clinical Laboratory Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangdong 510000, China ; 2 Department of Internal Medicine, The Third Clinical College of Guangzhou Medical University, Guangdong 510000, China ; 3 Center for Severe maternal Treatment of Guangzhou City, The Third Affiliated Hospital of Guangzhou Medical University, Guangdong 510000, China ; 4 Center for Clinical Laboratory Medicine of PLA, Xijing Hospital, Fourth Military Medical University, Xi'an 710000, China
| | - Xu-Guang Guo
- 1 Department of Clinical Laboratory Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangdong 510000, China ; 2 Department of Internal Medicine, The Third Clinical College of Guangzhou Medical University, Guangdong 510000, China ; 3 Center for Severe maternal Treatment of Guangzhou City, The Third Affiliated Hospital of Guangzhou Medical University, Guangdong 510000, China ; 4 Center for Clinical Laboratory Medicine of PLA, Xijing Hospital, Fourth Military Medical University, Xi'an 710000, China
| | - Shan Zhou
- 1 Department of Clinical Laboratory Medicine, The Third Affiliated Hospital of Guangzhou Medical University, Guangdong 510000, China ; 2 Department of Internal Medicine, The Third Clinical College of Guangzhou Medical University, Guangdong 510000, China ; 3 Center for Severe maternal Treatment of Guangzhou City, The Third Affiliated Hospital of Guangzhou Medical University, Guangdong 510000, China ; 4 Center for Clinical Laboratory Medicine of PLA, Xijing Hospital, Fourth Military Medical University, Xi'an 710000, China
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Severe fever with thrombocytopenia syndrome, an emerging tick-borne zoonosis. THE LANCET. INFECTIOUS DISEASES 2014; 14:763-772. [DOI: 10.1016/s1473-3099(14)70718-2] [Citation(s) in RCA: 310] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Mulholland C, Hoffmann B, McMenamy MJ, Korthase C, Earley B, Markey B, Cassidy JP, McKillen J, Allan G, Welsh MD. The development of an accelerated reverse-transcription loop mediated isothermal amplification for the serotype specific detection of bluetongue virus 8 in clinical samples. J Virol Methods 2014; 202:95-100. [PMID: 24642243 DOI: 10.1016/j.jviromet.2014.03.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 03/04/2014] [Accepted: 03/07/2014] [Indexed: 11/26/2022]
Abstract
In 2006 bluetongue virus serotype 8 (BTV 8) was identified for the first time in the Netherlands causing a major epidemic in sheep and cattle that quickly spread to neighbouring Belgium, Germany and beyond to France and the UK. This resulted in severe animal health and welfare problems as well as substantial economic losses to the agrifood industries of these countries. Given that the early diagnosis of BTV infection 'in-the-field' is extremely useful to its subsequent management and control, this study was established to design a novel, sensitive and rapid nucleic acid diagnostic test for the serotype-specific detection of BTV 8, which could be used without the use of advanced laboratory support and equipment. Primers for the detection of BTV 8 were based on genome segment 2 of the virus, the VP2 gene. The assay was assessed using a full panel of BTV reference strains and clinical samples. Positive amplification was observed using a fluorescent detection reagent. The sensitivity of the RT-LAMP assay was 102 copies of RNA. The assay did not amplify the closely related orbivirus EHDV. This novel RT-LAMP offers a sensitive, specific and rapid method of detecting BTV 8. The approach is inexpensive and easy to use and could potentially be used in a 'pen-side' setting 'in the field' or by smaller less well-equipped laboratories in developing countries.
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Affiliation(s)
- Catherine Mulholland
- Agri Food Biosciences Institute, Veterinary Sciences Division, Stoney Road, Stormont, Belfast BT4 3SD, UK; Animal and Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Dunsany, Co. Meath, Ireland; School of Veterinary Medicine, Veterinary Sciences Centre, University College Dublin, Belfield, Ireland.
| | - Bernd Hoffmann
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Michael J McMenamy
- Agri Food Biosciences Institute, Veterinary Sciences Division, Stoney Road, Stormont, Belfast BT4 3SD, UK
| | - Christian Korthase
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, 17493 Greifswald-Insel Riems, Germany
| | - Bernadette Earley
- Animal and Bioscience Research Department, Animal & Grassland Research and Innovation Centre, Teagasc, Grange, Dunsany, Co. Meath, Ireland
| | - Bryan Markey
- School of Veterinary Medicine, Veterinary Sciences Centre, University College Dublin, Belfield, Ireland
| | - Joseph P Cassidy
- School of Veterinary Medicine, Veterinary Sciences Centre, University College Dublin, Belfield, Ireland
| | - John McKillen
- Agri Food Biosciences Institute, Veterinary Sciences Division, Stoney Road, Stormont, Belfast BT4 3SD, UK
| | - Gordon Allan
- Agri Food Biosciences Institute, Veterinary Sciences Division, Stoney Road, Stormont, Belfast BT4 3SD, UK
| | - Michael D Welsh
- Agri Food Biosciences Institute, Veterinary Sciences Division, Stoney Road, Stormont, Belfast BT4 3SD, UK
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Liu S, Chai C, Wang C, Amer S, Lv H, He H, Sun J, Lin J. Systematic review of severe fever with thrombocytopenia syndrome: virology, epidemiology, and clinical characteristics. Rev Med Virol 2013; 24:90-102. [PMID: 24310908 PMCID: PMC4237196 DOI: 10.1002/rmv.1776] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2013] [Revised: 10/19/2013] [Accepted: 11/04/2013] [Indexed: 01/12/2023]
Abstract
Severe fever with thrombocytopenia syndrome (SFTS) was firstly discovered in China in 2010, followed by several reports from many other countries worldwide. SFTS virus (SFTSV) has been identified as the causative agent of the disease and has been recognized as a public health threat. This novel Bunyavirus belongs to the Phlebovirus genus in the family Bunyaviridae. This review also describes the different aspects of virology, pathogenesis, epidemiology, and clinical symptoms on the basis of the published article surveillance data and phylogenetic analyses of viral sequences of large, medium, and small segments retrieved from database using mega 5.05, simplot 3.5.1, network 4.611, and epi information system 3.5.3 software. SFTS presents with fever, thrombocytopenia, leukocytopenia, and considerable changes in several serum biomarkers. The disease has 10 ∼ 15% mortality rate, commonly because of multiorgan dysfunction. SFTSV is mainly reported in the rural areas of Central and North-Eastern China, with seasonal occurrence from May to September, mainly targeting those of ≥50 years of age. A wide range of domesticated animals, including sheep, goats, cattle, pigs, dogs, and chickens have been proven seropositive for SFTSV. Ticks, especially Haemaphysalis longicornis, are suspected to be the potential vector, which have a broad animal host range in the world. More studies are needed to elucidate the vector–animal–human ecological cycle, the pathogenic mechanisms in high level animal models and vaccine development. © 2013 The Authors. Reviews in Medical Virology published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Shelan Liu
- Department of Infectious Diseases, Zhejiang Provincial Centre for Disease Control and Prevention, Hangzhou, Zhejiang Province, China
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