1
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Iqbal BN, Arunasalam S, Divarathna MVM, Jabeer AAOM, Sirisena PDNN, Senaratne T, Muthugala R, Noordeen F. Diagnostic utility and validation of a newly developed real time loop mediated isothermal amplification method for the detection of SARS CoV-2 infection. JOURNAL OF CLINICAL VIROLOGY PLUS 2022; 2:100081. [PMID: 35540180 PMCID: PMC9069985 DOI: 10.1016/j.jcvp.2022.100081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 04/23/2022] [Accepted: 05/04/2022] [Indexed: 01/17/2023] Open
Abstract
Background Detecting SARS-CoV-2 using a simple real time molecular assay will be helpful for the mitigation efforts in low / middle income countries during the pandemic. We have developed and validated a rapid and simple real time loop mediated isothermal amplification assay (LAMP) for screening of SARS-CoV-2 infection in known infected and non-infected individuals. Methods Six sets of primers were designed targeting the N-gene of the SARS-CoV-2 (Accession ID MN994468). LAMP reactions were performed using Warm Start 2X Master Mix and real-time PCR machine at 65 °C for 60 cycles with 15 s for each cycle. Results were read by visualizing turbidity under ultraviolet light and real time fluorescence detection through FAM channel of the real time PCR machine. We tested a total of 320 including 240 SARS CoV-2 positive (Ct values <40) and 80 SARS CoV-2 negative samples as tested by a real time RT-PCR using the newly developed LAMP assay. Results A total of 206 out of 240 SARS CoV-2 positive samples were tested positive by the newly developed LAMP assay with a sensitivity of 86%. All 80 SARS CoV-2 negative samples were tested negative by the newly developed LAMP assay with a specificity of 100%. Conclusion The newly developed real time LAMP assay has a sensitivity of 86% and specificity of 100% compared to the real time RT-PCR for the detection of SARS CoV-2. The new assay will be useful to screen large number of samples if adopted to minimize the time and cost.
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Affiliation(s)
- Bushran N Iqbal
- Diagnostic and Research Virology Laboratory, Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Shiyamalee Arunasalam
- Diagnostic and Research Virology Laboratory, Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - Maduja V M Divarathna
- Diagnostic and Research Virology Laboratory, Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | - AAOM Jabeer
- Diagnostic and Research Virology Laboratory, Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka
| | | | - Thamarasi Senaratne
- Department of Multidisciplinary Sciences, Faculty of Allied Health Sciences, General Sir John Kotelawala Defense University, Werahera, Ratmalana 10390, Sri Lanka
| | - Rohitha Muthugala
- Diagnostic and Reference Virology Laboratory, National Hospital, Kandy 20000, Sri Lanka
| | - Faseeha Noordeen
- Diagnostic and Research Virology Laboratory, Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka,Corresponding author
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Othman S, Lee PY, Lam JY, Philip N, Azhari NN, Affendy NB, Masri SN, Neela VK, Mohd-Taib FS, Chee HY. A versatile isothermal amplification assay for the detection of leptospires from various sample types. PeerJ 2022; 10:e12850. [PMID: 35291487 PMCID: PMC8918162 DOI: 10.7717/peerj.12850] [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: 10/05/2021] [Accepted: 01/07/2022] [Indexed: 01/10/2023] Open
Abstract
Background Leptospirosis is a zoonotic disease caused by bacteria of the genus Leptospira that affects both humans and animals worldwide. Early detection of the pathogen in humans is crucial for early intervention and control of the progression of the disease to a severe state. It is also vitally important to be able to detect the presence of the pathogen in carrier animals to control the spread of the disease from the environment. Here we developed a simple and rapid loop-mediated isothermal amplification (LAMP) assay targeting the leptospiral secY gene. Results Several reaction conditions of the LAMP reaction were optimized to ensure efficient amplification of the target DNA. The sensitivity of the developed LAMP assay obtained using a pure Leptospira culture was 2 × 104 copies of genomic DNA per reaction (equivalent to 0.1 ng) for a 40-minute reaction time. No cross-reactions were observed in the LAMP reaction against a series of non-leptospiral bacteria, indicating a specific reaction. The applicability of the LAMP assay was demonstrated on human blood and urine specimens collected from suspected leptospirosis patients and rat kidney specimens collected from suspected leptospirosis outbreak areas and high-risk areas. The developed LAMP assay demonstrated a higher detection rate for leptospiral DNA compared with the polymerase chain reaction (PCR) assay, possibly due to the presence of inhibitory substances, especially in rat kidney specimens, to which the PCR method is more susceptible. The present findings also highlight the importance of urine sample collection from patients for routine monitoring of the disease. Conclusions In short, the developed LAMP assay can serve as a feasible alternative tool for the diagnosis of leptospirosis and be used for epidemiological and environmental surveillance of the disease, considering its robustness, rapidity, sensitivity, and specificity, as demonstrated in this study.
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Affiliation(s)
- Shuhaidah Othman
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Pui-Yuei Lee
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Jia-Yong Lam
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Noraini Philip
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Nurul Natasya Azhari
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Norliza Bahtiar Affendy
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Siti Norbaya Masri
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Vasantha Kumari Neela
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Farah Shafawati Mohd-Taib
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia
| | - Hui-Yee Chee
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
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Gunasegar S, Neela VK. Evaluation of diagnostic accuracy of loop-mediated isothermal amplification method (LAMP) compared with polymerase chain reaction (PCR) for Leptospira spp. in clinical samples: a systematic review and meta-analysis. Diagn Microbiol Infect Dis 2021; 100:115369. [PMID: 33845305 DOI: 10.1016/j.diagmicrobio.2021.115369] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 02/20/2021] [Accepted: 03/06/2021] [Indexed: 12/29/2022]
Abstract
Loop-mediated isothermal amplification (LAMP) test is widely used in molecular diagnostics as a point-of-care technique alternative to traditional PCR especially in resource-limited countries. LAMP has been recently used to diagnose leptospirosis. Therefore, we undertook a systematic review and meta-analysis to compare the accuracy of LAMP with PCR in the diagnosis of leptospirosis. Sixty-one studies were extracted from three international databases and analyzed throughout using the PRISMA guideline. The pooled sensitivity of LAMP and PCR technique was 0.80 (95% CI: 0.58-0.90) and 0.54 (95% CI: 0.35-0.67) respectively indicating that LAMP is more sensitive than PCR. The Q* value of LAMP and PCR-based technique is 274.61 and 397.95, respectively. Among the analyzed studies, significant heterogeneity was observed where I2 is 90.90% for LAMP-based and 86.18% for PCR-based. Our study suggests that LAMP has better diagnostic accuracy than PCR. However, future work should be carried out to reduce heterogeneity as well as to improve and develop effective intervention strategies.
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Affiliation(s)
- Shan Gunasegar
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Vasantha Kumari Neela
- Department of Medical Microbiology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.
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Abdullah Al-Maskri AA, Ye J, Talap J, Hu H, Sun L, Yu L, Cai S, Zeng S. Reverse transcription-based loop-mediated isothermal amplification strategy for real-time miRNA detection with phosphorothioated probes. Anal Chim Acta 2020; 1126:1-6. [PMID: 32736712 DOI: 10.1016/j.aca.2020.06.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/22/2020] [Accepted: 06/02/2020] [Indexed: 12/27/2022]
Abstract
A novel reverse transcription-based loop-mediated isothermal amplification (LAMP) strategy for miRNA detection has been developed. This method consists of two stem-loop probes inspired by the dumbbell-shaped amplicons and inner primers used in conventional LAMP reactions. Termed "terminal hairpin formation and self-priming" (THSP), this reaction incorporates phosphorothioated (PS) modifications to achieve DNA folding and extension without primers. The final signal is monitored by a sequence-specific detection probe, which minimizes the background noise. We suggest that our rapid, facile, and reliable LAMP method will be a promising candidate for detecting miRNA in biomedical applications.
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Affiliation(s)
- Abdu Ahmed Abdullah Al-Maskri
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Jiawei Ye
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Jadera Talap
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Haihong Hu
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Lianli Sun
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Lushan Yu
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Sheng Cai
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
| | - Su Zeng
- Institute of Drug Metabolism and Pharmaceutical Analysis, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research, College of Pharmaceutical Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
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Ngasaman R, Saechan V, Prachantasena S, Yingkajorn M, Sretrirutchai S. Investigation of Leptospira Infection in Stray Animals in Songkhla, Thailand: Leptospirosis Risk Reduction in Human. Vector Borne Zoonotic Dis 2020; 20:432-435. [PMID: 31905047 DOI: 10.1089/vbz.2019.2549] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Leptospirosis is a zoonosis of public health concern in Thailand. Human leptospirosis presents severe illness and can be fatal due to pulmonary hemorrhage, kidney failure, or cardiac impairment. Infected animals show no clinical signs and play an important role in the Leptospira infection of humans and other hosts. The prevalence of leptospirosis in stray animals in Thailand is unknown. The aim of this study was to investigate the incidence of Leptospira infection in stray animals including dogs and cats in Songkhla province, Thailand. A total of 434 blood samples were collected from 370 stray dogs and 64 stray cats during a population control program from 2014 to 2018. Screening the serum samples using the latex agglutination test to detect antibodies against Leptospira interrogans showed that 29.26% (127/434) were positive. There were 120 positive samples for stray dogs and 7 positive samples for stray cats. The detection of positive samples by polymerase chain reaction specific to the LipL32 of L. interrogans showed 1.61% (7/434) were positive. Stray cats (5/64) showed a higher prevalence than stray dogs (2/370), which might be because they are more likely to come into contact with rodents in their habitat. Although the active infection detected was low, the seroprevalence was high. This result indicated that the stray animals might not have been infected at the time of sample collection, but that they had been infected in the past or were in a latent period of infection. Therefore, they might serve as a leptospirosis reservoir for domestic animals and humans present in the same environment. The results show that stray animals need health care, such as vaccination, surveillance, and treatment, when infected to prevent or reduce the risk of transmission to humans.
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Affiliation(s)
| | - Vannarat Saechan
- Faculty of Veterinary Science, Prince of Songkla University, Songkhla, Thailand
| | | | - Mingkwan Yingkajorn
- Department of Pathology, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Somporn Sretrirutchai
- Department of Pathology, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
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6
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Monica N, Rathinasabapathi P, Ramya M. Development of real-time loop-mediated isothermal amplification (RealAmp) method for sensitive and rapid detection of pathogenic and nonpathogenicLeptospira. Lett Appl Microbiol 2019; 68:196-203. [DOI: 10.1111/lam.13108] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 12/16/2018] [Accepted: 12/17/2018] [Indexed: 11/28/2022]
Affiliation(s)
- N.I. Monica
- Department of Genetic Engineering; School of Bioengineering; SRM Institute of Science and Technology; Kattankulathur Tamil Nadu India
| | - P. Rathinasabapathi
- Department of Genetic Engineering; School of Bioengineering; SRM Institute of Science and Technology; Kattankulathur Tamil Nadu India
| | - M. Ramya
- Department of Genetic Engineering; School of Bioengineering; SRM Institute of Science and Technology; Kattankulathur Tamil Nadu India
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Chadsuthi S, Chalvet-Monfray K, Wiratsudakul A, Suwancharoen D, Cappelle J. A remotely sensed flooding indicator associated with cattle and buffalo leptospirosis cases in Thailand 2011-2013. BMC Infect Dis 2018; 18:602. [PMID: 30497412 PMCID: PMC6267035 DOI: 10.1186/s12879-018-3537-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 11/20/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Leptospirosis is an important zoonotic disease worldwide, caused by spirochetes bacteria of the genus Leptospira. In Thailand, cattle and buffalo used in agriculture are in close contact with human beings. During flooding, bacteria can quickly spread throughout an environment, increasing the risk of leptospirosis infection. The aim of this study was to investigate the association of several environmental factors with cattle and buffalo leptospirosis cases in Thailand, with a focus on flooding. METHOD A total of 3571 urine samples were collected from cattle and buffalo in 107 districts by field veterinarians from January 2011 to February 2013. All samples were examined for the presence of leptospirosis infection by loop-mediated isothermal amplification (LAMP). Environmental data, including rainfall, percentage of flooded area (estimated by remote sensing), average elevation, and human and livestock population density were used to build a generalized linear mixed model. RESULTS A total of 311 out of 3571 (8.43%) urine samples tested positive by the LAMP technique. Positive samples were recorded in 51 out of 107 districts (47.66%). Results showed a significant association between the percentage of the area flooded at district level and leptospirosis infection in cattle and buffalo (p = 0.023). Using this data, a map with a predicted risk of leptospirosis can be developed to help forecast leptospirosis cases in the field. CONCLUSIONS Our model allows the identification of areas and periods when the risk of leptospirosis infection is higher in cattle and buffalo, mainly due to a seasonal flooding. The increased risk of leptospirosis infection can also be higher in humans too. These areas and periods should be targeted for leptospirosis surveillance and control in both humans and animals.
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Affiliation(s)
- Sudarat Chadsuthi
- Department of Physics, Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand.
| | - Karine Chalvet-Monfray
- Université Clermont Auvergne, Université de Lyon, INRA, VetAgro Sup, UMR EPIA, 63122, Saint Genès Champanelle, France
| | - Anuwat Wiratsudakul
- Department of Clinical Sciences and Public Health, and the Monitoring and Surveillance Center for Zoonotic Diseases in Wildlife and Exotic Animals, Faculty of Veterinary Science, Mahidol University, Nakhon Pathom, 73170, Thailand
| | - Duangjai Suwancharoen
- National Institute of Animal Health, Department of Livestock Development, Bangkok, 10900, Thailand
| | - Julien Cappelle
- Université Clermont Auvergne, Université de Lyon, INRA, VetAgro Sup, UMR EPIA, 63122, Saint Genès Champanelle, France.,ASTRE, CIRAD, INRA, Université de Montpellier, 34398, Montpellier, France.,CIRAD, UMR ASTRE, 34398, Montpellier, France
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8
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Cai S, Jung C, Bhadra S, Ellington AD. Phosphorothioated Primers Lead to Loop-Mediated Isothermal Amplification at Low Temperatures. Anal Chem 2018; 90:8290-8294. [PMID: 29968462 DOI: 10.1021/acs.analchem.8b02062] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Loop-mediated isothermal amplification (LAMP) is an extremely powerful tool for the detection of nucleic acids with high sensitivity and specificity. However, LAMP shows optimal performance at around 65 °C, which limits applications in point-of-care-testing (POCT). Here, we have developed a version of LAMP that uses phosphorothioated primers (PS-LAMP) to enable more efficient hairpin formation and extension at the termini of growing concatamers, and that therefore works at much lower temperatures. By including additional factors such as chaotropes (urea) and single-stranded DNA binding protein (SSB), the sensitivities and selectivities for amplicon detection with PS-LAMP at 40 °C were comparable with a regular LAMP reaction at 65 °C.
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Affiliation(s)
- Sheng Cai
- Laboratory of Pharmaceutical Analysis and Drug Metabolism, Zhejiang Province Key Laboratory of Anti-Cancer Drug Research , Zhejiang University , Hangzhou , Zhejiang 310058 , China
| | - Cheulhee Jung
- Division of Biotechnology , College of Life Sciences and Biotechnology, Korea University , Seoul 02841 , Republic of Korea
| | - Sanchita Bhadra
- Institute for Cellular and Molecular Biology, Department of Molecular Biosciences , University of Texas at Austin , Austin , Texas 78712 , United States
| | - Andrew D Ellington
- Institute for Cellular and Molecular Biology, Department of Molecular Biosciences , University of Texas at Austin , Austin , Texas 78712 , United States
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Hou P, Wang H, Zhao G, He C, He H. Rapid detection of infectious bovine Rhinotracheitis virus using recombinase polymerase amplification assays. BMC Vet Res 2017; 13:386. [PMID: 29237466 PMCID: PMC5729238 DOI: 10.1186/s12917-017-1284-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 11/17/2017] [Indexed: 12/18/2022] Open
Abstract
Background Infectious bovine rhinotracheitis virus (IBRV) is a major pathogen in cattle and has led to significant economic losses to the dairy industry worldwide, and therefore a more optimal method for the rapid diagnosis of IBRV infection is highly needed. In this study, we described the development of a lateral flow dipstrip (LFD) of isothermal recombinase polymerase amplification (RPA) method for rapid detection of IBRV. Methods Distinct regions were selected as a candidate target for designing the LFD-RPA primers and probes. The analytical sensitivity of the RPA assay was determined using ten-fold serially diluted IBRV DNA. The specificity of the assay was assessed with other viral pathogens of cattle with similar clinic and other herpesviruses. The clinical performance was evaluated by testing 106 acute-phase high fever clinical specimens. Results RPA primers and probe were designed to target the specific conserved UL52 region fragment of IBRV. The detection could be completed at a constant temperature of 38 °C for 25 min, and the amplification products were easily visualized on a simple LFD. The detection limit of this assay was 5 copies per reaction of IBRV DNA and there was no cross-reactivity with other viruses causing bovine gastrointestinal and respiratory infections or other herpesviruses. The assay performance on acute-phase high fever clinical samples collected from cattle with no vaccine against IBRV, which were suspected to be infected with IBRV, was validated by detecting 24 fecal, 36 blood, 38 nasal swab and 8 tissue specimens, and compared with SYBR Green I based real-time PCR. The coincidence between IBRV LFD-RPA and real-time PCR was 100%. Conclusion IBRV LFD-RPA was fast and much easier to serve as an alternative to the common measures used for IBRV diagnosis, as there is reduction in the use of instruments for identification of the infected animals. In addition, this assay may be the potential candidate to be used as point-of-care diagnostics in the field.
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Affiliation(s)
- Peili Hou
- Key Laboratory of Animal Resistant Biology of Shandong, Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan City, Shandong Province, China
| | - Hongmei Wang
- Key Laboratory of Animal Resistant Biology of Shandong, Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan City, Shandong Province, China.
| | - Guimin Zhao
- Key Laboratory of Animal Resistant Biology of Shandong, Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan City, Shandong Province, China
| | - Chengqiang He
- Key Laboratory of Animal Resistant Biology of Shandong, Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan City, Shandong Province, China
| | - Hongbin He
- Key Laboratory of Animal Resistant Biology of Shandong, Ruminant Diseases Research Center, College of Life Sciences, Shandong Normal University, No. 88 East Wenhua Road, Jinan City, Shandong Province, China.
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Rapid and visual detection of Leptospira in urine by LigB-LAMP assay with pre-addition of dye. Mol Cell Probes 2017; 36:29-35. [DOI: 10.1016/j.mcp.2017.08.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 07/26/2017] [Accepted: 08/08/2017] [Indexed: 11/19/2022]
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Development of a thermostabilised triplex LAMP assay with dry-reagent four target lateral flow dipstick for detection of Entamoeba histolytica and non-pathogenic Entamoeba spp. Anal Chim Acta 2017; 966:71-80. [DOI: 10.1016/j.aca.2017.02.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 02/07/2017] [Accepted: 02/10/2017] [Indexed: 01/15/2023]
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12
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Leptospirosis in Central America: Techniques for Diagnosis and Molecular Characterization. CURRENT TROPICAL MEDICINE REPORTS 2017. [DOI: 10.1007/s40475-017-0106-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Suwancharoen D, Limlertvatee S, Chetiyawan P, Tongpan P, Sangkaew N, Sawaddee Y, Inthakan K, Wiratsudakul A. A nationwide survey of pathogenic leptospires in urine of cattle and buffaloes by Loop-mediated isothermal amplification (LAMP) method in Thailand, 2011-2013. J Vet Med Sci 2016; 78:1495-1500. [PMID: 27302016 PMCID: PMC5059378 DOI: 10.1292/jvms.15-0493] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Leptospirosis is a worldwide distributed zoonosis which has long been endemic in
Thailand. Cattle and buffaloes are important livestock species that live in close contact
with humans, especially in rural areas. These animals may, therefore, act as long-term
carriers of leptospirosis for humans and other livestock species. The present study
employed loop-mediated isothermal amplification (LAMP) method to detect pathogenic
leptospiral 16S rDNA in the urine of cattle and buffaloes for assessing associations
between uroprevalence and species, sex, age and spatial distribution. A total of 3,657
urine samples were collected for laboratory diagnosis, and 312 of which turned positive to
the test (true prevalence 5.90%; 95% CI 4.98–6.91). The highest true uroprevalence was
found in lower northern region at 19.80% (95% CI 15.83–24.32) followed by upper and lower
northeastern regions at 15.22% and 6.25%, respectively. However, the highest true
uroprevalence in beef cattle, the majority of cattle in Thailand, was recorded in
northeastern region which is the endemic area of human leptospirosis. The uroprevalence
was not statistically different among species and types of examined animals. Male animals
were over twice more likely to be infected compared to females. Excluding animals younger
than one year of age due to small sample size, the uroprevalence upraised with increasing
age. A collaborative investigation between veterinary and public health sectors is
required to holistically explore the link between leptospirosis in humans and livestock,
especially in high prevalent areas.
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Affiliation(s)
- Duangjai Suwancharoen
- National Institute of Animal Health, Department of Livestock Development, 50/2 Kasetklang, Ladyao, Chatuchak, Bangkok 10900, Thailand
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Abdulmawjood A, Wickhorst J, Hashim O, Sammra O, Hassan AA, Alssahen M, Lämmler C, Prenger-Berninghoff E, Klein G. Application of a loop-mediated isothermal amplification (LAMP) assay for molecular identification of Trueperella pyogenes isolated from various origins. Mol Cell Probes 2016; 30:205-210. [PMID: 27242007 DOI: 10.1016/j.mcp.2016.05.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 05/26/2016] [Accepted: 05/26/2016] [Indexed: 10/21/2022]
Abstract
In the present study 28 Trueperella pyogenes strains isolated from various origins could successfully be identified with a newly designed loop-mediated isothermal amplification (LAMP) assay based on gene cpn60 encoding chaperonin. No cross reaction could be observed with control strains representing four species of genus Trueperella and seven species of closely related genus Arcanobacterium. The present cpn60 LAMP assay might allow a reliable and low cost identification of T. pyogenes also in laboratories with less specified equipment.
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Affiliation(s)
- A Abdulmawjood
- Institute of Food Quality and Food Safety, Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173 Hannover, Germany.
| | - J Wickhorst
- Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Gießen, Schubertstr 81, 35392 Gießen, Germany
| | - O Hashim
- Institute of Food Quality and Food Safety, Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173 Hannover, Germany
| | - O Sammra
- Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Gießen, Schubertstr 81, 35392 Gießen, Germany
| | - A A Hassan
- Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Gießen, Schubertstr 81, 35392 Gießen, Germany
| | - M Alssahen
- Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Gießen, Schubertstr 81, 35392 Gießen, Germany
| | - C Lämmler
- Institut für Pharmakologie und Toxikologie, Justus-Liebig-Universität Gießen, Schubertstr 81, 35392 Gießen, Germany
| | - E Prenger-Berninghoff
- Institut für Hygiene und Infektionskrankheiten der Tiere, Justus-Liebig-Universität, Frankfurterstr. 85-91, 35392 Gießen, Germany
| | - G Klein
- Institute of Food Quality and Food Safety, Research Center for Emerging Infections and Zoonoses (RIZ), University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173 Hannover, Germany
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