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Uduwawala H, Manamperi A, Gunaratna GPS, Karunanayake L, Ceruti A, Abd El Wahed A, Fernando L, Premaratna R, Hapugoda M. Detection of pathogenic Leptospira with rapid extraction followed by recombinase polymerase amplification (RPA) and quantitative polymerase chain reaction (qPCR) assay-A comprehensive study from Sri Lanka. PLoS One 2024; 19:e0295287. [PMID: 38489285 PMCID: PMC10942058 DOI: 10.1371/journal.pone.0295287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 11/16/2023] [Indexed: 03/17/2024] Open
Abstract
Leptospirosis is the most widespread zoonosis in the world. The disease is more prevalent in tropical regions where the majority of developing countries are located. Leptospirosis is considered a protean manifestation zoonosis with severity of the disease ranging from a mild febrile illness to a severe and life-threatening illness. Clinical symptoms of leptospirosis overlap with other tropical febrile illnesses. Early, rapid, and definitive diagnosis is important for effective patient management. Since Polymerase Chain Reaction (PCR)-based assays are not readily available in most clinical settings, there is a need for an affordable, simple, and rapid diagnostic test. Quantitative PCR (qPCR) and Recombinase Polymerase Amplification (RPA) were implemented at the Faculty of Medicine, University of Kelaniya, and a prospective study to evaluate RPA for diagnosis of acute phase of leptospirosis was conducted. Results indicate that RPA and qPCR were positive in 81% (98/121) of the total positive and acute clinical samples. Of the 81 positive MAT confirmed patients 60 (74%) and 53 (65%) were positive with qPCR and RPA respectively. Retrospective evaluation revealed a high diagnostic accuracy (sensitivity-70% and specificity-87%) of RPA compared to MAT as the reference gold standard. Results further suggest that there is no significant difference between the two assays, qPCR and RPA-SwiftX (P = 0.40). Laboratory procedures for the extraction and detection by qPCR in the laboratory have been optimized to obtain results within 6 hours. However, the RPA-SwiftX method under field conditions took 35 minutes. The RPA-SwiftX method could replace the qPCR which shows similar sensitivity and specificity. Therefore, RPA established under the current study presents a powerful tool for the early and rapid diagnosis of leptospirosis at point-of-care.
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Affiliation(s)
- Hansi Uduwawala
- Molecular Medicine Unit, Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka
| | - Aresha Manamperi
- Molecular Medicine Unit, Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka
| | - Gayana P. S. Gunaratna
- Department of Medical Microbiology, Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka
| | - Lilani Karunanayake
- National Reference Laboratory for Leptospirosis, Medical Research Institute, Colombo, Sri Lanka
| | - Arianna Ceruti
- Institute of Animal Hygiene and Veterinary Public Health, Leipzig University, Leipzig, Germany
| | - Ahmed Abd El Wahed
- Institute of Animal Hygiene and Veterinary Public Health, Leipzig University, Leipzig, Germany
| | - Lakkumar Fernando
- Centre for Clinical Management of Dengue & Dengue Haemorrhagic Fever, District General Hospital, Negombo, Sri Lanka
| | - Ranjan Premaratna
- Department of Medicine, Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka
| | - Menaka Hapugoda
- Molecular Medicine Unit, Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka
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Khurana S, Sharma C, Guleria S, Mewara A, Dutta U. Real-time loop-mediated isothermal amplification for the detection of Giardia duodenalis in fecal specimens. Indian J Med Microbiol 2024; 47:100492. [PMID: 37918212 DOI: 10.1016/j.ijmmb.2023.100492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/12/2023] [Accepted: 10/06/2023] [Indexed: 11/04/2023]
Abstract
INTRODUCTION Giardiasis is a leading cause of subacute or chronic diarrhoea and is frequently associated with impaired physical, cognitive and psychosocial development, especially in children. The diagnosis relies mainly on the microscopic evaluation of stool specimens that have a low sensitivity. In contrast, molecular advancements like the polymerase chain reaction and Real-time loop-mediated isothermal amplification (Real-time LAMP) are promising techniques and reportedly have better diagnostic characteristics. METHODS We have evaluated the performance of Real-time LAMP for detecting Giardia in ninety stool specimens compared to microscopy and nested PCR. RESULTS A total of 35 fecal samples were detected positive by microscopy, 41 by nested PCR and 43 by real-time LAMP. Microscopy and nested PCR detected 33, microscopy and real-time LAMP detected 35, and nested PCR and real-time LAMP detected 41 positive samples. CONCLUSION The real-time LAMP assay was found suitable for the rapid and accurate detection of G. duodenalis with a better sensitivity in comparison to nested PCR and microscopy. Furthermore, besides being sensitive and rapid, LAMP had the advantage of an adequate rapid turn-around time of eleven to 15 min as compared to 5 h of nested PCR.
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Affiliation(s)
- Sumeeta Khurana
- Department of Medical Parasitology, Post Graduate Institute of Medical Education &Research, Chandigarh, India.
| | - Chayan Sharma
- Department of Medical Parasitology, Post Graduate Institute of Medical Education &Research, Chandigarh, India.
| | - Sucheta Guleria
- Department of Medical Parasitology, Post Graduate Institute of Medical Education &Research, Chandigarh, India.
| | - Abhishek Mewara
- Department of Medical Parasitology, Post Graduate Institute of Medical Education &Research, Chandigarh, India.
| | - Usha Dutta
- Department of Gastroenterology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India.
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Nascimento GM, Gomes Rodrigues DL, Mangas Catarino DG, Piastrelli FT, Cheno MY, Braz KCC, Oliveira Alves LB, Avezum Á, Veiga VC, Zavascki AP, Tomazini B, Besen B, Pereira AJ, Marques de Pinho APN, De Oliveira Junior HA. Application of ventilator-associated events (VAE) in ventilator-associated pneumonia (VAP) notified in Brazil (IMPACTO MR-PAV): a protocol for a cohort study. BMJ Open 2023; 13:e076047. [PMID: 38070904 PMCID: PMC10729162 DOI: 10.1136/bmjopen-2023-076047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 11/15/2023] [Indexed: 12/18/2023] Open
Abstract
INTRODUCTION Certain criteria for ventilator-associated events (VAE) definition might influence the type of an event, its detection rate and consequently the resource expenditure in intensive care unit. The Impact of Infections by Antimicrobial-Resistant Microorganisms - Ventilator-Associated Pneumonia (IMPACTO MR-PAV) aims to evaluate the incidence and diagnostic accuracy of ventilator-associated pneumonia (VAP) using the current criteria for VAP surveillance in Brazil versus the VAE criteria defined by the US National Healthcare Safety Network-Center for Diseases Control and Prevention (CDC) criteria. METHODS AND ANALYSIS The study will be conducted in around 15 centres across Brazil from October 2022 to December 2023. Trained healthcare professionals will collect data and compare the incidence of VAP using both the current criteria for VAP surveillance in Brazil and the VAE criteria defined by the CDC. The accuracy of the two criteria for identifying VAP will also be analysed. It will also characterise other events associated with mechanical ventilation (ventilator-associated condition, infection-related ventilator-associated complication) and adjudicate VAP reported to the Brazilian Health Regulatory Agency (ANVISA) using current epidemiological diagnostic criteria. ETHICS AND DISSEMINATION This study was approved by the Institutional Review Board under the number 52354721.0.1001.0070. The study's primary outcome measure will be the incidence of VAP using the two different surveillance criteria, and the secondary outcome measures will be the accuracy of the two criteria for identifying VAP and the adjudication of VAP reported to ANVISA. The results will contribute to the improvement of VAP surveillance in Brazil and may have implications for other countries that use similar criteria. TRIAL REGISTRATION NUMBER NCT05589727; Clinicaltrials.gov.
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Affiliation(s)
| | | | | | | | - Maysa Yukari Cheno
- Sustainability and Social Responsibility, Hospital Alemão Oswaldo Cruz, Sao Paulo, Brazil
| | | | | | - Álvaro Avezum
- International Research Center, Hospital Alemão Oswaldo Cruz, Sao Paulo, Brazil
| | - Viviane C Veiga
- Hospital Beneficencia Portuguesa de Sao Paulo, Sao Paulo, Brazil
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Domínguez-Rodríguez S, Liz-López H, Panizo-LLedot A, Ballesteros Á, Dagan R, Greenberg D, Gutiérrez L, Rojo P, Otheo E, Galán JC, Villanueva S, García S, Mosquera P, Tagarro A, Moraleda C, Camacho D. Testing the performance, adequacy, and applicability of an artificial intelligence model for pediatric pneumonia diagnosis. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2023; 242:107765. [PMID: 37704545 DOI: 10.1016/j.cmpb.2023.107765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 07/07/2023] [Accepted: 08/13/2023] [Indexed: 09/15/2023]
Abstract
BACKGROUND Community-acquired Pneumonia (CAP) is a common childhood infectious disease. Deep learning models show promise in X-ray interpretation and diagnosis, but their validation should be extended due to limitations in the current validation workflow. To extend the standard validation workflow we propose doing a pilot test with the next characteristics. First, the assumption of perfect ground truth (100% sensitive and specific) is unrealistic, as high intra and inter-observer variability have been reported. To address this, we propose using Bayesian latent class models (BLCA) to estimate accuracy during the pilot. Additionally, assessing only the performance of a model without considering its applicability and acceptance by physicians is insufficient if we hope to integrate AI systems into day-to-day clinical practice. Therefore, we propose employing explainable artificial intelligence (XAI) methods during the pilot test to involve physicians and evaluate how well a Deep Learning model is accepted and how helpful it is for routine decisions as well as analyze its limitations by assessing the etiology. This study aims to apply the proposed pilot to test a deep Convolutional Neural Network (CNN)-based model for identifying consolidation in pediatric chest-X-ray (CXR) images already validated using the standard workflow. METHODS For the standard validation workflow, a total of 5856 public CXRs and 950 private CXRs were used to train and validate the performance of the CNN model. The performance of the model was estimated assuming a perfect ground truth. For the pilot test proposed in this article, a total of 190 pediatric chest-X-ray (CXRs) images were used to test the CNN model support decision tool (SDT). The performance of the model on the pilot test was estimated using extensions of the two-test Bayesian Latent-Class model (BLCA). The sensitivity, specificity, and accuracy of the model were also assessed. The clinical characteristics of the patients were compared according to the model performance. The adequacy and applicability of the SDT was tested using XAI techniques. The adequacy of the SDT was assessed by asking two senior physicians the agreement rate with the SDT. The applicability was tested by asking three medical residents before and after using the SDT and the agreement between experts was calculated using the kappa index. RESULTS The CRXs of the pilot test were labeled by the panel of experts into consolidation (124/176, 70.4%) and no-consolidation/other infiltrates (52/176, 29.5%). A total of 31/176 (17.6%) discrepancies were found between the model and the panel of experts with a kappa index of 0.6. The sensitivity and specificity reached a median of 90.9 (95% Credible Interval (CrI), 81.2-99.9) and 77.7 (95% CrI, 63.3-98.1), respectively. The senior physicians reported a high agreement rate (70%) with the system in identifying logical consolidation patterns. The three medical residents reached a higher agreement using SDT than alone with experts (0.66±0.1 vs. 0.75±0.2). CONCLUSIONS Through the pilot test, we have successfully verified that the deep learning model was underestimated when a perfect ground truth was considered. Furthermore, by conducting adequacy and applicability tests, we can ensure that the model is able to identify logical patterns within the CXRs and that augmenting clinicians with automated preliminary read assistants could accelerate their workflows and enhance accuracy in identifying consolidation in pediatric CXR images.
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Affiliation(s)
- Sara Domínguez-Rodríguez
- Pediatric Research and Clinical Trials Unit (UPIC). Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Helena Liz-López
- Computer Systems Engineering Department, Universidad Politécnica de Madrid, Spain
| | - Angel Panizo-LLedot
- Computer Systems Engineering Department, Universidad Politécnica de Madrid, Spain.
| | - Álvaro Ballesteros
- Pediatric Research and Clinical Trials Unit (UPIC). Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Ron Dagan
- Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel
| | - David Greenberg
- Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel; Soroka University Medical Center, Beer-Sheva, Israel
| | - Lourdes Gutiérrez
- Pediatric Research and Clinical Trials Unit (UPIC). Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Pablo Rojo
- Pediatric Research and Clinical Trials Unit (UPIC). Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain; Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Enrique Otheo
- Hospital Universitario Ramón y Cajal. Pediatrics Department, Madrid, Spain
| | - Juan Carlos Galán
- Hospital Universitario Ramón y Cajal, Microbiology Department, Madrid, Spain
| | - Sara Villanueva
- Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Sonsoles García
- Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Pablo Mosquera
- Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Alfredo Tagarro
- Pediatric Research and Clinical Trials Unit (UPIC). Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain; Fundación para la Investigación e Innovación Biomédica del Hospital Universitario Infanta Sofía y Hospital Universitario del Henares. Madrid, Spain; Pediatrics Research Group. Universidad Europea de Madrid. Pediatrics, Madrid, Spain
| | - Cinta Moraleda
- Pediatric Research and Clinical Trials Unit (UPIC). Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain; Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre, Madrid, Spain
| | - David Camacho
- Computer Systems Engineering Department, Universidad Politécnica de Madrid, Spain
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Drummond MR, Dos Santos LS, de Almeida AR, Lins KDA, Barjas-Castro ML, Diniz PPVDP, Velho PENF. Comparison of molecular methods for Bartonella henselae detection in blood donors. PLoS Negl Trop Dis 2023; 17:e0011336. [PMID: 37262044 DOI: 10.1371/journal.pntd.0011336] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 04/25/2023] [Indexed: 06/03/2023] Open
Abstract
The Bartonella genus consists of neglected pathogens associated with potentially transfusional-transmitted and fatal human diseases. We aimed to evaluate Bartonella sp. prevalence in 500 blood donors and compare the results with the data already published about these samples. We used molecular diagnostic methods to detect Bartonella sp.-DNA from blood and liquid culture samples: (A) conventional PCR for two gene regions, the ITS targeting the genus Bartonella and the specific gltA Bartonella henselae; (B) nested PCR for the ftsZ gene and (C) qualitative real-time PCR for the gltA gene, both B. henselae specific. We obtained 30/500 (6%) DNA detections from the blood samples; 77/500 (15.4%) DNA detections from liquid culture samples and five (1%) samples had DNA detection from both. In total, we detected B. henselae DNA from 102/500 (20.4%) donors. The samples used in this study had already been submitted for Bartonella sp.-DNA detection using only a conventional PCR in liquid culture. Sixteen samples (3.2%) were positive previously, and from these 16 samples, 13 were negative in the new investigation. We concluded that the use of liquid culture combined with different molecular tests increases the possibility of detecting Bartonella sp.-DNA, but the tests do not avoid false-negative results. More than a fifth of blood donors had at least one PCR that detected Bartonella sp.-DNA among the eight molecular reactions performed now (four reactions in whole blood and four in liquid culture). Seven percent had B. henselae-DNA detection for two or more distinct regions. Considering the results obtained previously, the DNA of Bartonella spp. was detected or the agent isolated in 23% of analyzed blood donors. The results establish that the low bacteremia and the fastidious characteristics of the bacterium are challenges to laboratory diagnosis and can make it difficult to confirm the infection in patients with bartonelloses.
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Affiliation(s)
- Marina Rovani Drummond
- Applied Research in Dermatology and Bartonella Infection Laboratory, University of Campinas-UNICAMP; Campinas, Sao Paulo, Brazil
| | - Luciene Silva Dos Santos
- Applied Research in Dermatology and Bartonella Infection Laboratory, University of Campinas-UNICAMP; Campinas, Sao Paulo, Brazil
| | - Amanda Roberta de Almeida
- Applied Research in Dermatology and Bartonella Infection Laboratory, University of Campinas-UNICAMP; Campinas, Sao Paulo, Brazil
| | - Karina de Almeida Lins
- Applied Research in Dermatology and Bartonella Infection Laboratory, University of Campinas-UNICAMP; Campinas, Sao Paulo, Brazil
| | | | | | - Paulo Eduardo Neves Ferreira Velho
- Applied Research in Dermatology and Bartonella Infection Laboratory, University of Campinas-UNICAMP; Campinas, Sao Paulo, Brazil
- Division of Dermatology, Department of Medicine, UNICAMP, Campinas, Sao Paulo, Brazil
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Moraleda C, Domínguez-Rodríguez S, Mesa JM, García-Sánchez P, de la Serna M, Alonso-Cadenas JA, Bermejo A, Sabrido G, Martínez-Campos L, González-Posada AF, Illán-Ramos M, Cobos-Carrascosa E, Ballesteros Á, Galán JC, Llorente F, Aguilera-Alonso D, Jiménez AB, Catalán P, Dahdouh E, Navarro I, Fernández-Garoz B, Mendoza P, Pérez-Jorge C, Cabezas-Fernández T, Blázquez-Gamero D, Rivas G, Gonzalez-Donapetry P, Sáez E, Fernández-Pinero J, Lucas-Fernández J, Pérez-Ramírez E, Merino P, Miragaya S, Lorente J, Iglesias I, Tagarro A. Oral saliva swab reverse transcription PCR for Covid-19 in the paediatric population. Arch Dis Child 2022; 107:1051-1058. [PMID: 35688603 PMCID: PMC9240444 DOI: 10.1136/archdischild-2021-323712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 05/12/2022] [Indexed: 11/21/2022]
Abstract
OBJECTIVES To evaluate the performance of oral saliva swab (OSS) reverse transcription PCR (RT-PCR) compared with RT-PCR and antigen rapid diagnostic test (Ag-RDT) on nasopharyngeal swabs (NPS) for SARS-CoV-2 in children. DESIGN Cross-sectional multicentre diagnostic study. SETTING Study nested in a prospective, observational cohort (EPICO-AEP) performed between February and March 2021 including 10 hospitals in Spain. PATIENTS Children from 0 to 18 years with symptoms compatible with Covid-19 of ≤5 days of duration were included. Two NPS samples (Ag-RDT and RT-PCR) and one OSS sample for RT-PCR were collected. MAIN OUTCOME Performance of Ag-RDT and RT-PCR on NPS and RT-PCR on OSS sample for SARS-CoV-2. RESULTS 1174 children were included, aged 3.8 years (IQR 1.7-9.0); 73/1174 (6.2%) patients tested positive by at least one of the techniques. Sensitivity and specificity of OSS RT-PCR were 72.1% (95% CI 59.7 to 81.9) and 99.6% (95% CI 99 to 99.9), respectively, versus 61.8% (95% CI 49.1 to 73) and 99.9% (95% CI 99.4 to 100) for the Ag-RDT. Kappa index was 0.79 (95% CI 0.72 to 0.88) for OSS RT-PCR and 0.74 (95% CI 0.65 to 0.84) for Ag-RDT versus NPS RT-PCR. CONCLUSIONS RT-PCR on the OSS sample is an accurate option for SARS-CoV-2 testing in children. A less intrusive technique for younger patients, who usually are tested frequently, might increase the number of patients tested.
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Affiliation(s)
- Cinta Moraleda
- Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre. Pediatric Research and Clinical Trials Unit (UPIC). RITIP (Translational Research Network in Pediatric Infectious Diseases), Madrid, Spain
- Instituto de Investigación 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Sara Domínguez-Rodríguez
- Instituto de Investigación 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Juan Miguel Mesa
- Paediatrics Department. Pediatrics Research Group, Hospital Universitario Infanta Sofia, San Sebastian de los Reyes, Madrid, Spain
| | - Paula García-Sánchez
- Emergency Pediatric Department. Instituto Investigación Hospital La Paz (IDIPaz), Hospital Universitario La Paz, Madrid, Spain
| | - María de la Serna
- Paediatrics Department. Pediatrics Research Group, Hospital Universitario Infanta Sofia, San Sebastian de los Reyes, Madrid, Spain
| | - José Antonio Alonso-Cadenas
- Emergency Pediatric Department. Instituto Investigación La Princesa, Hospital Infantil Universitario Niño Jesús, Madrid, Spain
| | - Amanda Bermejo
- Pediatric Department, Hospital Universitario de Móstoles, Móstoles, Madrid, Spain
| | - Gema Sabrido
- Pediatric Department, Hospital Universitario Rey Juan Carlos, Móstoles, Madrid, Spain
| | - Leticia Martínez-Campos
- Pediatric Infectious Diseases, Materno Infantil. Hospital Universitario Torrecárdenas, Almeria, Spain
| | | | - Marta Illán-Ramos
- Pediatrics Department, Hospital Universitario Clínico San Carlos, Madrid, Spain
| | - Elena Cobos-Carrascosa
- Instituto de Investigación 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Álvaro Ballesteros
- Instituto de Investigación 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
| | - Juan Carlos Galán
- Microbiology Department, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS). Centro de Investigación Biomédica en Red en Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Francisco Llorente
- Centro de Investigacion en Sanidad Animal INIA-CSIC, Valdeolmos, Madrid, Spain
| | - David Aguilera-Alonso
- Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario Gregorio Marañón. Unidad de Investigación Maternoinfantil Fundación Familia Alonso (UDIMIFFA), Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM). CIBER en Enfermedades Infecciosas (CIBERINFEC), Madrid, Spain
| | - Ana Belén Jiménez
- Pediatrics Department, Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
| | - Pilar Catalán
- Servicio de Microbiologia Clinica y Enfermedades Infecciosas, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Elias Dahdouh
- Clinical Microbiology and Parasitology Department, Hospital Universitario La Paz. IdiPAZ, Madrid, Spain
| | - Ignacio Navarro
- Paediatrics Department. Pediatrics Research Group, Hospital Universitario Infanta Sofia, San Sebastian de los Reyes, Madrid, Spain
| | | | - Pablo Mendoza
- Microbiology Department, Hospital Universitario de Móstoles, Mostoles, Madrid, Spain
| | - Concepción Pérez-Jorge
- Microbiology Department, Hospital Universitario Rey Juan Carlos, Mostoles, Madrid, Spain
| | | | - Daniel Blázquez-Gamero
- Pediatric Infectious Diseases Unit. Department of Pediatrics, Hospital Universitario 12 de Octubre. Pediatric Research and Clinical Trials Unit (UPIC). RITIP (Translational Research Network in Pediatric Infectious Diseases), Madrid, Spain
- Instituto de Investigación 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
- Universidad Complutense, Madrid, Spain
| | - Gonzalo Rivas
- Microbiology Department, Hospital Universitario 12 de Octubre, Madrid, Spain
| | | | - Elena Sáez
- Microbiology Department, UR Salud. Hospital Universitario Infanta Sofía. Paediatrics Research Group, San Sebastian de los Reyes, Madrid, Spain
| | | | - Jesús Lucas-Fernández
- Microbiology Department, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS). Centro de Investigación Biomédica en Red en Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
| | - Elisa Pérez-Ramírez
- Centro de Investigacion en Sanidad Animal INIA-CSIC, Valdeolmos, Madrid, Spain
| | - Paloma Merino
- Microbiology Department, Hospital Universitario Clínico San Carlos, Madrid, Spain
| | - Sandra Miragaya
- Clinic Analysis Department, Hospital Infantil Universitario Niño Jesús, Madrid, Spain
| | - Jorge Lorente
- Emergency Pediatric Department, Hospital General Universitario Gregorio Marañón, Madrid, Spain
| | - Irene Iglesias
- Centro de Investigacion en Sanidad Animal INIA-CSIC, Valdeolmos, Madrid, Spain
| | - Alfredo Tagarro
- Instituto de Investigación 12 de Octubre (imas12), Fundación para la Investigación Biomédica del Hospital 12 de Octubre, Madrid, Spain
- Paediatrics Department. Pediatrics Research Group, Hospital Universitario Infanta Sofia, San Sebastian de los Reyes, Madrid, Spain
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Diagnosis of Human Leptospirosis: Comparison of Microscopic Agglutination Test with Recombinant LigA/B Antigen-Based In-House IgM Dot ELISA Dipstick Test and Latex Agglutination Test Using Bayesian Latent Class Model and MAT as Gold Standard. Diagnostics (Basel) 2022; 12:diagnostics12061455. [PMID: 35741265 PMCID: PMC9221883 DOI: 10.3390/diagnostics12061455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 05/28/2022] [Accepted: 05/31/2022] [Indexed: 12/03/2022] Open
Abstract
Leptospirosis is a spirochaetal infection that possesses a broad host range affecting almost all mammals. In the present study, the microscopic agglutination test (MAT) was compared with recombinant LigA/B antigen-based point-of-care diagnostics such as the in-house IgM dot ELISA dipstick test (IgM- DEDT) and the latex agglutination test (LAT) for the serodiagnosis of human leptospirosis. The comparison of the MAT with these two point–of-care diagnostics was performed using the MAT as the gold standard test and using Bayesian latent class modelling (BLCM), which considers all diagnostic tests as imperfect. The N-terminal conserved region of the LigA/B protein spanning the first to fifth big tandem repeat domains (rLigA/BCon1-5) was employed as a serodiagnostic marker in both of the bedside assays. A total of 340 serum samples collected from humans involved in high risk occupations were screened using the MAT, IgM DEDT and LAT. During the early phase of leptospirosis, BLCM analysis showed that the IgM DEDT and LAT had similar sensitivities (99.6 (96.0–100)) and (99.5 (95.2–100)), respectively, while the single acute phase MAT had the lowest sensitivity (83.3 (72.8–91.3)). Both the IgM DEDT and the LAT may be superior to the single acute phase MAT in terms of sensitivity during the early phase of infection and may be suitable for the early diagnosis of leptospirosis. However, BLCM analysis revealed that the use of both acute and convalescent samples substantially increased the sensitivity of the final MAT (98.2% (93.0–99.8%)) as a test to diagnose human leptospirosis. Both the IgM DEDT and LAT can be employed as bedside spot tests in remote locations where the MAT is not easily accessible.
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Scope and limitations of a multiplex conventional PCR for the diagnosis of S. stercoralis and hookworms. Braz J Infect Dis 2021; 25:101649. [PMID: 34774469 PMCID: PMC9392200 DOI: 10.1016/j.bjid.2021.101649] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 09/23/2021] [Accepted: 10/17/2021] [Indexed: 11/20/2022] Open
Abstract
OBJECTIVES Describe the diagnostic characteristics of a conventional multiplex PCR for the diagnosis of S. stercoralis, N. americanus and Ancylostomas spp. METHODS Fecal samples were collected from a cross-sectional study in Orán department, Salta province, Argentina. The stool samples were analyzed using concentration-sedimentation, Harada Mori, McMaster, and Baermann techniques. DNA was extracted from 50 mg fecal sample using the FastPrep® Spin Kit for Soil. Three pairs of primers were used for the amplification of three products of 101, 330, and 577 base pairs (bp) for S. stercoralis, N. americanus and Ancylostoma spp, respectively. The sensitivity and analytical specificity of multiplex PCR were evaluated, as well as the sensitivity and diagnostic specificity, using a composite standard and Bayesian approach. RESULTS AND CONCLUSIONS Multiplex PCR did not present cross-reaction with other intestinal parasites, and the detection limit for multiplex PCR was between 2 and 20 pg of genomic DNA. In addition it presented a diagnostic sensitivity of 97.4% for S. stercoralis and 90.3% for hookworms with a specificity of 100% and 87.6%, respectively. PCR identified a higher proportion (p <0.01) of coinfections (15.3%) than microscopic techniques (3.5%). Also, multiplex PCR showed that there was a positive association between S. stercoralis and hookworms (odds ratio = 2.12). However, this association was due to N. americanus (odds ratio= 3.22), since no association was observed between S. stercoralis and Ancylostoma spp. Neither was an association observed between the two species of hookworms.
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9
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Ngaba GP, Kalla GCM, Assob JCN, Njouendou AJ, Jembe CN, Mboudou ET, Mbopi-Keou FX. [Evaluation of two COVID-19 antigenic diagnostic tests: BIOSYNEX® COVID-19 Ag BSS and BIOSYNEX® COVID-19 Ag + BSS compared to AmpliQuick® SARS-CoV-2 PCR]. Pan Afr Med J 2021; 39:228. [PMID: 34630840 PMCID: PMC8486925 DOI: 10.11604/pamj.2021.39.228.30752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Accepted: 07/29/2021] [Indexed: 11/25/2022] Open
Abstract
Introduction la pandémie à COVID-19 pose des problèmes de diagnostic biologique qui restent d´actualité dans les pays à faible revenu en général et au Cameroun en particulier. Les tests rapides détectant l´antigène du virus SARS-CoV-2 fiables se présentent comme une alternative importante. L´objectif de notre étude était d´évaluer les performances diagnostiques des tests de diagnostic rapide BIOSYNEX®COVID-19 Ag BSS et BIOSYNEX®COVID-19 Ag+ BSS comparés entre eux, puis comparés au test PCR AmpliQuick® SARS-CoV-2. Méthodes une étude transversale et comparative a été menée du 27 avril au 29 mai 2021 dans la ville de Douala au Cameroun. Les échantillons étaient constitués de prélèvements nasopharyngés reçus au laboratoire de biologie moléculaire de l'Hôpital Gynéco-Obstétrique et Pédiatrique de Douala. Les paramètres sociodémographiques (âge, profession (footballeurs, voyageurs, autres), statut matrimonial, nationalité), comorbidité et statut connu du COVID-19, ont été enregistrés sur les sites de collecte. Les principaux sites de collecte étaient le District de santé de Deïdo et l'Hôpital Gynéco-Obstétrique et Pédiatrique de Douala. Nous avons effectué le diagnostic du COVID-19 en utilisant les tests de diagnostic rapide BIOSYNEX® COVID-19 Ag BSS et BIOSYNEX® COVID-19 Ag+ BSS que nous avons d´abord comparé entre eux, puis nous les avons comparés au test PCR AmpliQuick®SARS-CoV-2 sur chaque échantillon. L'analyse statistique des données a été réalisée à l'aide des logiciels Microsoft Excel et SPSS version 17. Pour déterminer la sensibilité des deux tests de diagnostic rapide, le modèle bayésien de classe latente a été réalisé sur la médiane avec un intervalle de confiance à 95 %, et p<0,05 comme seuil de significativité. Une autorisation éthique a été demandée et obtenue auprès du Comité d'éthique Institutionnel (CEI) de l'Université de Douala. Résultats un total de 1813 participants a été inclus dans cette étude, avec une prédominance d'hommes (1226, 68,68 %) et la tranche d'âge la plus représentée était celle des 31 à 40 ans (568, 31,33 %). La plupart des participants étaient mariés (888, 53,46%) et seuls quelques-uns avaient un statut COVID-19 connu (75, 5,47%). Les prévalences de COVID-19 retrouvées avec les deux tests de diagnostic rapide étaient de 2,03 et 2,17 pour BIOSYNEX® COVID-19 Ag BSS et BIOSYNEX®COVID-19 Ag + BSS respectivement. Une sensibilité de 94,1% a été retrouvée pour le test BIOSYNEX® COVID-19 Ag BSS tandis que pour le test BIOSYNEX® COVID-19 Ag + BSS, la sensibilité était de 87,5%. La spécificité était de 98,9% et 98,7% pour le test BIOSYNEX® COVID-19 Ag + BSS et BIOSYNEX® COVID-19 Ag BSS respectivement par rapport à AmpliQuick® SARS-CoV-2. Le test BIOSYNEX® COVID-19 Ag + BSS a montré une valeur prédictive négative de 99.9% par rapport au test BIOSYNEX® COVID-19 Ag BSS. Un accord de 99,9% a été retrouvé entre les tests BIOSYNEX® COVID-19 Ag BSS et BIOSYNEX® COVID-19 Ag + BSS. Conclusion: les tests de diagnostic rapide BIOSYNEX® COVID-19 Ag + BSS et BIOSYNEX® COVID-19 Ag BSS peuvent être utilisés pour le diagnostic du SARS-CoV-2 et peuvent être d´un apport important dans le dépistage de masse et le dépistage en zones reculées.
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Affiliation(s)
- Guy Pascal Ngaba
- Faculté de Médecine et des Sciences Pharmaceutiques, Université de Douala, Douala, Cameroun.,Hôpital Gynéco-Obstétrique et Pédiatrique de Douala, Douala, Cameroun
| | | | | | | | | | - Emile Télesphore Mboudou
- Hôpital Gynéco-Obstétrique et Pédiatrique de Douala, Douala, Cameroun.,Faculté de Médecine et des Sciences Biomédicales, Université de Yaoundé I, Yaoundé, Cameroun
| | - François-Xavier Mbopi-Keou
- Faculté de Médecine et des Sciences Biomédicales, Université de Yaoundé I, Yaoundé, Cameroun.,Institut pour le Développement de l'Afrique (The-IDA), Yaoundé, Cameroun
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10
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Ngaba GP, Kalla GCM, Assob JCN, Njouendou AJ, Jembe CN, Mboudou ET, Mbopi-Keou FX. Comparative analysis of two molecular tests for the detection of COVID-19 in Cameroon. Pan Afr Med J 2021; 39:214. [PMID: 34630826 PMCID: PMC8486926 DOI: 10.11604/pamj.2021.39.214.30718] [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: 07/08/2021] [Accepted: 07/16/2021] [Indexed: 11/11/2022] Open
Abstract
Introduction COVID-19 equation in Cameroon is yet to be resolved. There is an urgent need for a rapid response strategy to the increasing demand of polymerase chain reaction (PCR) test results for both patients, travelers and competitors to various games. We assessed the diagnostic performance of the AmpliQuick® SARS-CoV-2 against the classic Reverse transcription polymerase chain reaction (RT-PCR). Methods a cross-sectional and comparative study was conducted from April 27th to May 29th, 2021 in the city of Douala, Cameroon. The samples consisted of any nasopharyngeal sample received at the Douala Gynaeco-Obstetrics and Pediatric Hospital molecular biology laboratory, regardless of its origin. Sociodemographic parameters (age, profession (footballers, travelers, other), matrimonial status, nationality), comorbidity and known status of COVID-19, were recorded at collection sites. The main collection sites were the Deido Health District and the Douala Gynaeco-Obstetric and Pediatric Hospital. We performed testing using AmpliQuick® SARS-CoV-2 and the classic RT-PCR (Da An Gene Co.Ltd) on each sample during the one month period. Analytical performance parameters were determined. To determine the sensitivity of both methods, the Bayesian latent class model was performed on the median with 95% confidence interval, with p≤0.05 as significant level, as well as Kappa (κ) agreement between tests. An ethical clearance was sought and obtained from the University of Douala Institutional Ethics Committee. Results a total of 1813 participants were enrolled, with the predominance of male (68.68%) and the age group 31 to 40 years old (31.33%). Most participants were married (53.46%) with only few with known COVID-19 status (5.47%). One thousand eight hundred and ten (1810) tests were performed by AMPLIQUICK® SARS-CoV-2 while only 1107 could be achieved with the classic RT-PCR. Over the study period, it was noted a drastic reduction in the time necessary to render results with the AMPLIQUICK® SARS-CoV-2 from 24 hours to 3 hours. The AMPLIQUICK® SARS-CoV-2 reduced technician hands-on time and its practicability was noticed based on the prefilled and ready-to-use microplates. A prevalence of 1.93% and 1.45% were obtained for AMPLIQUICK® SARS-CoV-2 and the classic RT-PCR respectively. This difference in the prevalence showed that AMPLIQUICK® SARS-CoV-2 (Sensitivity 83.5% [CI=64.6-95.2]) was more accurate than the classic RT-PCR (67.8% [CI=46.6-84.9]). Conclusion it is time for a change of attitude to scale up the COVID-19 testing ability in Cameroon and the AMPLIQUICK® SARS-CoV-2 is an alternative diagnosis strategy which should help resolve the situation of timely and reliable results.
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Affiliation(s)
- Guy Pascal Ngaba
- Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon.,Gynaeco-Obstetrics and Pediatric Hospital Douala, Douala, Cameroon
| | | | | | | | | | - Emile Télesphore Mboudou
- Gynaeco-Obstetrics and Pediatric Hospital Douala, Douala, Cameroon.,Faculty of Medicine and Biomedical Sciences, University of Yaounde I, Yaounde, Cameroon
| | - Francois-Xavier Mbopi-Keou
- Faculty of Medicine and Biomedical Sciences, University of Yaounde I, Yaounde, Cameroon.,The Institute for the Development of Africa (The-IDA), Yaounde, Cameroon
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11
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Varchetta S, Mele D, D'Ambrosio R, Perbellini R, Lombardi A, Rojas A, Paolucci S, Baldanti F, Oliviero B, Mantovani S, Tinelli C, De Silvestri A, Romero Gomez M, Lampertico P, Mondelli MU. A new algorithm shows superior ability to discriminate liver fibrosis stages in chronic hepatitis C. J Viral Hepat 2021; 28:1443-1451. [PMID: 34228858 DOI: 10.1111/jvh.13570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/11/2021] [Accepted: 06/30/2021] [Indexed: 12/09/2022]
Abstract
Previous evidence suggests that sialic acid-binding Ig-like lectin 7 (Siglec-7) protein is significantly increased in patients with chronic hepatitis C virus (HCV) infection and directly correlates with clinical parameters of liver inflammation and fibrosis. The aim of this study was to determine the diagnostic value of Siglec-7 as a non-invasive tool to assess liver fibrosis in patients with chronic hepatitis C in a cross-sectional study. Serum levels of Siglec-7 were retrospectively tested in 1007 consecutive patients with chronic HCV infection recruited at three different European sites and data examined by the 'imperfect gold-standard' statistical analysis. Liver stiffness obtained by transient elastography (TE) was considered the standard reference. Liver fibrosis was staged according to published cut-offs of liver stiffness measurement by TE. Accuracy of detection of liver fibrosis stage was not increased by Siglec-7 alone. However, we developed a new index (SiGAP) including Siglec-7, γ-glutamyl transferase, age and platelet count which showed increased sensitivity and specificity in predicting fibrosis compared with APRI or FIB4 indices. The AUROC of SiGAP for the diagnosis of significant (≥F2) and advanced liver fibrosis (≥F3) showed significantly higher values than those of APRI and FIB-4. Siglec-7 may be useful as a complementary tool to assess liver fibrosis stage in patients with chronic hepatitis C when included in a specifically designed algorithm, which showed high level of accuracy in the detection of F2 and F3 fibrosis stage.
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Affiliation(s)
- Stefania Varchetta
- Division of Clinical Immunology and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Dalila Mele
- Division of Clinical Immunology and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Roberta D'Ambrosio
- Division of Gastroenterology and Hepatology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Riccardo Perbellini
- Division of Gastroenterology and Hepatology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Andrea Lombardi
- Division of Clinical Immunology and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Angela Rojas
- SeLiver Group, Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Sevilla, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain
| | - Stefania Paolucci
- Molecular Virology Unit, Division of Microbiology and Virology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Fausto Baldanti
- Molecular Virology Unit, Division of Microbiology and Virology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.,Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
| | - Barbara Oliviero
- Division of Clinical Immunology and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Stefania Mantovani
- Division of Clinical Immunology and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Carmine Tinelli
- Biostatistics Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | | | - Manuel Romero Gomez
- SeLiver Group, Instituto de Biomedicina de Sevilla (IBiS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Sevilla, Spain.,Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain.,UGC de Enfermedades Digestivas, Hospital Universitario Virgen del Rocío, Sevilla, Spain
| | - Pietro Lampertico
- Division of Gastroenterology and Hepatology, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy.,Department of Pathophysiology and Transplantation, CRC "A.M. and A. Migliavacca" Centre for Liver Disease, University of Milan, Milan, Italy
| | - Mario U Mondelli
- Division of Clinical Immunology and Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.,Department of Internal Medicine and Therapeutics, University of Pavia, Pavia, Italy
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12
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Alyethodi RR, Singh U, Kumar S, Alex R, Sengar GS, Raja TV, Deb R, Prakash B. Designing, optimization, and validation of whole blood direct T-ARMS PCR for precise and rapid genotyping of complex vertebral malformation in cattle. BMC Biotechnol 2021; 21:36. [PMID: 34022869 PMCID: PMC8141239 DOI: 10.1186/s12896-021-00696-5] [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: 05/05/2020] [Accepted: 05/11/2021] [Indexed: 12/04/2022] Open
Abstract
Background DNA testing in the cattle industry undergoes multiple hurdles. Successful genotyping involves the transportation of samples from the field to the laboratory in a chilled environment followed by DNA extraction, and finally, a specific genotyping protocol is followed. Various researches are focused on overcoming these issues. Microcards offer blood transportation at ambient temperature. Direct PCR methods can save the time of DNA extraction but available only for simplex PCR. Tetra Primer-Amplification Refractory Mutation System based Polymerase Chain Reaction (T-ARMS PCR) can make DNA testing faster in a low-cost setting. The present study was aimed to design, optimize, and validate a T-ARMS PCR for faster DNA testing of SNP responsible for Complex Vertebral Malformation (CVM)-an important genetic disease of the cattle industry. Further, a direct T-ARMS PCR from whole blood was developed to avoid the DNA extraction steps. Lastly, using the optimized protocol, genotyping of blood spotted on Microcard eliminates the need for cold chain maintenance in the transportation of samples. Results The present study demonstrated a novel T-ARMS PCR-based genotyping of the SNP rs438228855, which is responsible for CVM. Here, wild genotypes were recognized by 389 bp and 199 bp bands in agarose gel, while the carrier genotype showed an additional 241 bp band. The developed protocol was validated using PCR-Primer Introduced Restriction Analysis (PCR-PIRA) and sequencing. The present study further established a direct T-ARMS PCR for this SNP from whole blood. Different conditions such as heparin and EDTA treated blood, the need for pre-treatment, and two different DNA Polymerases for the direct PCR were optimized. Finally, our optimized protocol successfully genotyped the whole blood samples dried on Insta™DNA cards. Conclusions The present study reported the usefulness of primer modified T-ARMS PCR for detecting CVM for the first time. To the best of our knowledge, direct PCR in T-ARMS PCR has never been reported. Lastly, the use of microcards in the developed protocol can make the assay useful in the DNA testing of field samples. Supplementary Information The online version contains supplementary material available at 10.1186/s12896-021-00696-5.
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Affiliation(s)
- R R Alyethodi
- Animal Science Division, ICAR-Central Island Agricultural Research Institute, Garacharma, Andaman and Nicobar Islands, 744101, India.
| | - U Singh
- Animal genetics & Breeding Division, ICAR-Central Institute for Research on Cattle, Meerut, UP, India
| | - S Kumar
- Animal genetics & Breeding Division, ICAR-Central Institute for Research on Cattle, Meerut, UP, India
| | - R Alex
- Animal genetics & Breeding Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India
| | - G S Sengar
- Animal genetics & Breeding Division, ICAR-Central Institute for Research on Cattle, Meerut, UP, India
| | - T V Raja
- Animal genetics & Breeding Division, ICAR-Central Institute for Research on Cattle, Meerut, UP, India
| | - R Deb
- ICAR-National Research centre on Pig, Guwahati, Assam, India
| | - B Prakash
- Animal genetics & Breeding Division, ICAR-Central Institute for Research on Cattle, Meerut, UP, India
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13
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Rao M, Rashid FA, Sabri FSAH, Jamil NN, Seradja V, Abdullah NA, Ahmad H, Aren SL, Ali SAS, Ghazali M, Manaf AA, Talib H, Hashim R, Zain R, Thayan R, Amran F, Aris T, Ahmad N. COVID-19 screening test by using random oropharyngeal saliva. J Med Virol 2021; 93:2461-2466. [PMID: 33393672 PMCID: PMC7986796 DOI: 10.1002/jmv.26773] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 12/20/2020] [Accepted: 12/30/2020] [Indexed: 12/13/2022]
Abstract
An optimal clinical specimen for accurate detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) by minimizing the usage of consumables and reduce hazard exposure to healthcare workers is an urgent priority. The diagnostic performance of SARS-CoV-2 detection between healthcare worker-collected nasopharyngeal and oropharyngeal (NP + OP) swabs and patient performed self-collected random saliva was assessed. Paired NP + OP swabs and random saliva were collected and processed within 48 h of specimen collection from two cohort studies which recruited 562 asymptomatic adult candidates. Real-time reverse-transcription polymerase chain reaction targeting Open reading frame 1a (ORF1a) and nucleocapsid (N) genes was performed and the results were compared. Overall, 65 of 562 (28.1%) candidates tested positive for COVID-19 based on random saliva, NP + OP swabs, or both testing techniques. The detection rate of SARS-CoV-2 was higher in random saliva compared to NP + OP testing (92.3%; 60/65 vs. 73.8%; 48/65; p < .05). The estimated sensitivity and specificity of random saliva were higher than NP + OP swabs (95.0; 99.9 vs. 72.2; 99.4). The Ct values of ORF1a and N genes were significantly lower in random saliva compared to NP + OP swabs specimens. Our findings demonstrate that random saliva is an alternative diagnostic specimen for the detection of SARS-CoV-2. Self-collected random oropharyngeal saliva is a valuable specimen that provides accurate SARS-CoV-2 surveillance testing of a community.
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Affiliation(s)
- Mohan Rao
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Fairuz A. Rashid
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Fashihah S. A. H. Sabri
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Nur Nadia Jamil
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Valentinus Seradja
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | | | | | - S. L. Aren
- Kota Setar District Health OfficeKedahMalaysia
| | | | - Mawaddah Ghazali
- Kuala Lumpur International Airport Health OfficeSelangorMalaysia
| | - Anizan A. Manaf
- Kuala Lumpur International Airport Health OfficeSelangorMalaysia
| | - Harishah Talib
- Kuala Lumpur International Airport Health OfficeSelangorMalaysia
| | - Rohaidah Hashim
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Rozainanee Zain
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Ravindran Thayan
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Fairuz Amran
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Tahir Aris
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
| | - Norazah Ahmad
- Infectious Disease Research Centre, Institute for Medical ResearchMinistry of Health MalaysiaJalan PahangKuala LumpurMalaysia
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14
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Abstract
As technology advances, diagnostic tests continue to improve and each year, we are presented with new alternatives to standard procedures. Given the plethora of diagnostic alternatives, diagnostic tests must be evaluated to determine their place in the diagnostic armamentarium. The first step involves determining the accuracy of the test, including the sensitivity and specificity, positive and negative predictive values, likelihood ratios for positive and negative tests, and receiver operating characteristic (ROC) curves. The role of the test in a diagnostic pathway has then to be determined, following which the effect on patient outcome should be examined.
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Affiliation(s)
- Brendan J Barrett
- Department of Medicine, Memorial University of Newfoundland, St. John's, NF, Canada.
| | - John M Fardy
- Department of Medicine, Memorial University of Newfoundland, St. John's, NF, Canada.
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15
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Bafna P, Deepanjali S, Mandal J, Balamurugan N, Swaminathan RP, Kadhiravan T. Reevaluating the true diagnostic accuracy of dipstick tests to diagnose urinary tract infection using Bayesian latent class analysis. PLoS One 2021; 15:e0244870. [PMID: 33382863 PMCID: PMC7774958 DOI: 10.1371/journal.pone.0244870] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 12/17/2020] [Indexed: 01/14/2023] Open
Abstract
OBJECTIVE Previous studies on diagnostic accuracy of dipstick testing for leukocyte esterase (LE) and nitrite to diagnose urinary tract infection (UTI) had used urine culture, which is an imperfect gold standard. Estimates of diagnostic accuracy obtained using the classical gold standard framework might not reflect the true diagnostic accuracy of dipstick tests. METHODS We used the dataset from a prospective, observational study conducted in the emergency department of a teaching hospital in southern India. Patients with a clinical suspicion of UTI underwent dipstick testing for LE and nitrite, urine microscopy, and urine culture. Based on the results of urine microscopy and culture, UTI was classified into definite, probable, and possible. Patients with microscopic pyuria and a positive urine culture were adjudicated as definite UTI. Unequivocal imaging evidence of emphysematous pyelonephritis or perinephric collections was also considered definite UTI. We estimated the diagnostic accuracy of LE and nitrite tests using the classical analysis (assuming definite UTI as gold standard) and two different Bayesian latent class models (LCMs; 3-tests in 1-population and 2-tests in 2-populations models). RESULTS We studied 149 patients. Overall, 64 (43%) patients had definite, 76 (51%) had probable, and 2 (1.3%) had possible UTI; 7 (4.6%) had alternate diagnoses. In classical analysis, LE was more sensitive than nitrite (87.5% versus 70.5%), while nitrite was more specific (24% versus 58%). The 3-tests in 1-population Bayesian LCM indicated a substantially better sensitivity and specificity for LE (98.1% and 47.6%) and nitrite (88.2% and 97.7%). True sensitivity and specificity of urine culture as estimated by the model was 48.7% and 73.0%. Estimates of the 2-tests in 2-populations model were in agreement with the 3-tests in 1-population model. CONCLUSIONS Bayesian LCMs indicate a clinically important improvement in the true diagnostic accuracy of urine dipstick testing for LE and nitrite. Given this, a negative dipstick LE would rule-out UTI, while a positive dipstick nitrite would rule-in UTI in our study setting. True diagnostic accuracy of urine dipstick testing for UTI in various practice settings needs reevaluation using Bayesian LCMs.
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Affiliation(s)
- Prashant Bafna
- Department of Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Surendran Deepanjali
- Department of Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
- * E-mail:
| | - Jharna Mandal
- Department of Microbiology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Nathan Balamurugan
- Department of Emergency Medicine & Trauma, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Rathinam P. Swaminathan
- Department of Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
| | - Tamilarasu Kadhiravan
- Department of Medicine, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India
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16
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Joof E, Andrus PS, Sowunmi K, Onyango VM, Wade CM. Comparing PCR techniques against conventional cercarial shedding methods for detecting Schistosoma mansoni infection in Biomphalaria snails. Acta Trop 2020; 212:105716. [PMID: 32966841 DOI: 10.1016/j.actatropica.2020.105716] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 09/16/2020] [Accepted: 09/18/2020] [Indexed: 10/23/2022]
Abstract
The detection of Schistosoma mansoni infection in both its intermediate (snail) and definitive (human) hosts is useful in providing information on the transmission of schistosomiasis. Three pairs of previously designed PCR primers (SM1-7, SMF/R & ND5) used for the detection of S. mansoni infection were tested. We assess the utility of each of these primer sets for detecting S. mansoni infection both in artificially exposed laboratory bred Biomphalaria glabrata, and field infected African Biomphalaria sudanica and Biomphalaria pfeifferi. Two of the three primer sets (SMF/R & ND5) detected S. mansoni infection in snails, but amplification of S. mansoni DNA with SM1-7 was unreliable. For the artificially exposed laboratory bred B. glabrata snails, SMF/R and ND5 both detected infection in more snails than the cercarial shedding method. Infection detection rates were 62.4% for ND5, 57.1% for SMF/R and 50.4% using traditional cercarial shedding methods. Both SMF/R and ND5 detected S. mansoni infection in 91% of snails observed shedding cercariae, increasing to 98.5% when low stringency PCR methods were used. When comparing each of the detection methods using a Bayesian latent class analysis model, ND5 had the highest detection sensitivity and negative predictive value (NPV), while SMF/R had the highest detection specificity and positive predictive value (PPV). In field collected Biomphalaria snails, ND5 detected S. mansoni infection in 21 of 24 snails categorised as shedding S. mansoni cercariae and 4 of 24 snails categorised as shedding non-S. mansoni cercariae, while SMF/R detected infection in 18 of 24 snails categorised as shedding S. mansoni cercariae and in 3 of 24 snails categorised as shedding non-S. mansoni cercariae. All SMF/R and ND5 PCR products were shown to be S. mansoni indicating that these field snails must have been infected with both S. mansoni and cercariae from other Schistosoma species. This indicates that the two primer sets are specific for S. mansoni and will not amplify non-S. mansoni species when used at their recommended annealing temperatures. Both the SMF/R and ND5 primers effectively detected S. mansoni infection in three Biomphalaria species and have improved detection sensitivity over cercarial shedding.
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Differential susceptibility of Onchocerca volvulus microfilaria to ivermectin in two areas of contrasting history of mass drug administration in Cameroon: relevance of microscopy and molecular techniques for the monitoring of skin microfilarial repopulation within six months of direct observed treatment. BMC Infect Dis 2020; 20:726. [PMID: 33008333 PMCID: PMC7530974 DOI: 10.1186/s12879-020-05444-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2020] [Accepted: 09/23/2020] [Indexed: 11/24/2022] Open
Abstract
Background Ivermectin is an excellent microfilaricide against Onchocerca volvulus. However, in some regions, long term use of ivermectin has resulted in sub-optimal responses to the treatment. More data to properly document the phenomenon in various contexts of ivermectin mass drug administration (IVM-MDA) is needed. Also, there is a need to accurately monitor a possible repopulation of skin by microfilariae following treatment. Skin snip microscopy is known to have a low sensitivity in individuals with light infections, which can be the case following treatment. This study was designed with two complementary objectives: (i) to assess the susceptibility of O. volvulus microfilariae to ivermectin in two areas undergoing IVM-MDA for different lengths of time, and (ii) to document the repopulation of skin by the O. volvulus microfilariae following treatment, using 3 independent diagnostic techniques. Method Identified microfilaridermic individuals were treated with ivermectin and re-examined after 1, 3, and 6 months using microscopy, actin real-time PCR (actin-qPCR) and O-150 LAMP assays. Susceptibility to ivermectin and trends in detecting reappearance of skin microfilariae were determined using three techniques. Microscopy was used as an imperfect gold standard to determine the performance of actin-qPCR and LAMP. Results In Bafia with over 20 years of IVM-MDA, 11/51 (21.6%) direct observe treated microfilaridemic participants were still positive for skin microfilariae after 1 month. In Melong, with 10 years of IVM-MDA, 2/29 (6.9%) treated participants were still positive. The microfilarial density reduction per skin biopsy within one month following treatment was significantly lower in participants from Bafia. In both study sites, the molecular techniques detected higher proportions of infected individuals than microscopy at all monitoring time points. LAMP demonstrated the highest levels of sensitivity and real-time PCR was found to have the highest specificity. Conclusion Patterns in skin mirofilariae clearance and repopulation were established. O. volvulus worms from Bafia with higher number of annual MDA displayed a lower clearance and higher repopulation rate after treatment with ivermectin. Molecular assays displayed higher sensitivity in monitoring O. volvulus microfilaridemia within six months following treatment.
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Pérez LJ, Lanka S, DeShambo VJ, Fredrickson RL, Maddox CW. A Validated Multiplex Real-Time PCR Assay for the Diagnosis of Infectious Leptospira spp.: A Novel Assay for the Detection and Differentiation of Strains From Both Pathogenic Groups I and II. Front Microbiol 2020; 11:457. [PMID: 32265882 PMCID: PMC7100377 DOI: 10.3389/fmicb.2020.00457] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Accepted: 03/04/2020] [Indexed: 12/12/2022] Open
Abstract
Leptospirosis is recognized as the most globally widespread reemerging zoonosis and represents a serious threat for both human and animal health. Indeed, leptospirosis is linked to more than 60,000 human deaths per year and to incalculable economic burden as consequence of medical treatment costs and livestock loss. The increasing number of reports from species of pathogenic Leptospira spp. group II causing disease in both humans and animals constitutes an additional concern to the complex epidemiology of this zoonotic agent. Diagnostic methods based on qPCR have improved the diagnosis of Leptospira spp. in terms of cost, time, and reliability, but most of the validated assays fail to detect species from the pathogenic group II. Hence, the current study was aimed to develop and validate a novel multiplex qPCR to enable the specific and selective detection of the whole group of infectious Leptospira spp., including both pathogenic groups I and II and moreover, selectively discriminate between them. To fit the "fitness of purpose" for the specific detection of infectious Leptospira spp. and further discrimination between both pathogenic groups three target regions on the 16S RNA gene were selected. These targets facilitated a broad and selective spectrum for the detection of all infectious Leptospira spp. with the exclusion of all saprophytic groups and the novel clade of environmental Leptospira spp. The analytical sensitivity (ASe) showed by the new assay also enables a wide window of detection for the agent at different stages of infection since the assay was able to efficiently detect at 95% of confidence ∼5 leptospires/reaction. From the evaluation of the analytical specificity (ASp) by in silico and in vitro approaches, it was congruently revealed that the primers and probes selected only recognized the specific targets for which the assay was intended. Bayesian latent class analysis of performance of the new assay on 684 clinical samples showed values of diagnostic sensitivity of 99.8% and diagnostic specificity of 100%. Thus, from the evaluation of the analytical and diagnostic parameters, the new multiplex qPCR assay is a reliable method for the diagnosis of Leptospira spp.
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Affiliation(s)
- Lester J. Pérez
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois at Urbana–Champaign, Urbana, IL, United States
- Department of Clinical Veterinary Medicine, College of Veterinary Medicine, University of Illinois at Urbana–Champaign, Urbana, IL, United States
| | - Saraswathi Lanka
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois at Urbana–Champaign, Urbana, IL, United States
| | - Vanessa J. DeShambo
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois at Urbana–Champaign, Urbana, IL, United States
| | - Richard L. Fredrickson
- Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Illinois at Urbana–Champaign, Urbana, IL, United States
| | - Carol W. Maddox
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana–Champaign, Urbana, IL, United States
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Subakir H, Chong YM, Chan YF, Hasan MS, Jamaluddin MFH, Pang YK, Ponnampalavanar S, Syed Omar SF, Sam IC. Selective media and real-time PCR improves diagnosis of melioidosis in community-acquired pneumonia in a low-incidence setting in Kuala Lumpur, Malaysia. J Med Microbiol 2020; 69:49-51. [PMID: 31750812 DOI: 10.1099/jmm.0.001108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Introduction. Burkholderia pseudomallei (melioidosis) is an important cause of community-acquired pneumonia (CAP) in the tropics. Selective medium is recommended for laboratory diagnosis with non-sterile respiratory samples, while PCR is not routinely used due to variable reported performance. The effectiveness of these diagnostic modalities varies by site.Aim. To compare selective media and real-time PCR (qPCR) with routine media in detecting B. pseudomallei in CAP respiratory samples in a low-incidence setting in Kuala Lumpur, Malaysia.Methodology. Respiratory samples were routinely cultured on blood, chocolate and MacConkey agar (RESP-ROUTINE), and compared to culture on selective Ashdown medium (RESP-SELECTIVE) and qPCR. The gold standard was routine culture of B. pseudomallei from any site (ALL-ROUTINE).Results. B. pseudomallei was detected in 8/204 (3.9 %) samples. Overall sensitivity rates differed (P=0.03) for qPCR (100%), RESP-SELECTIVE (87.5%) and RESP-ROUTINE (50%). There was a trend towards lower median days to positive culture for RESP-SELECTIVE (1 day) compared to RESP-ROUTINE (2 days, P=0.08) and ALL-ROUTINE (2 days, P=0.06). Reagent costs for each additional detection were USD59 for RESP-SELECTIVE and USD354 for PCR.Conclusions. In a low-incidence setting, selective culture of respiratory samples on Ashdown was more sensitive and allowed quicker identification than routine media, at reasonable cost. Blood cultures are critical, confirming four cases missed by routine respiratory culture. Selective medium is useful in early pneumonia (pre-sepsis) and resource-limited settings where blood cultures are infrequently done. Real-time PCR is costly, but highly sensitive and useful for high-risk patients with diabetes, cancer or immunosuppressants, or requiring ventilation or intensive care.
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Affiliation(s)
- Haida Subakir
- Department of Medical Microbiology, Faculty of Medicine, University Malaya, Kuala Lumpur, 50603, Malaysia
| | - Yoong Min Chong
- Department of Medical Microbiology, Faculty of Medicine, University Malaya, Kuala Lumpur, 50603, Malaysia
| | - Yoke Fun Chan
- Department of Medical Microbiology, Faculty of Medicine, University Malaya, Kuala Lumpur, 50603, Malaysia
| | - M Shahnaz Hasan
- Department of Anesthesiology, Faculty of Medicine, University Malaya, Kuala Lumpur, 50603 Malaysia
| | | | - Yong Kek Pang
- Department of Medicine, Faculty of Medicine, University Malaya, Kuala Lumpur, 50603, Malaysia
| | | | | | - I-Ching Sam
- Department of Medical Microbiology, Faculty of Medicine, University Malaya, Kuala Lumpur, 50603, Malaysia
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Umemneku Chikere CM, Wilson K, Graziadio S, Vale L, Allen AJ. Diagnostic test evaluation methodology: A systematic review of methods employed to evaluate diagnostic tests in the absence of gold standard - An update. PLoS One 2019; 14:e0223832. [PMID: 31603953 PMCID: PMC6788703 DOI: 10.1371/journal.pone.0223832] [Citation(s) in RCA: 97] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 09/29/2019] [Indexed: 12/29/2022] Open
Abstract
OBJECTIVE To systematically review methods developed and employed to evaluate the diagnostic accuracy of medical test when there is a missing or no gold standard. STUDY DESIGN AND SETTINGS Articles that proposed or applied any methods to evaluate the diagnostic accuracy of medical test(s) in the absence of gold standard were reviewed. The protocol for this review was registered in PROSPERO (CRD42018089349). RESULTS Identified methods were classified into four main groups: methods employed when there is a missing gold standard; correction methods (which make adjustment for an imperfect reference standard with known diagnostic accuracy measures); methods employed to evaluate a medical test using multiple imperfect reference standards; and other methods, like agreement studies, and a mixed group of alternative study designs. Fifty-one statistical methods were identified from the review that were developed to evaluate medical test(s) when the true disease status of some participants is unverified with the gold standard. Seven correction methods were identified and four methods were identified to evaluate medical test(s) using multiple imperfect reference standards. Flow-diagrams were developed to guide the selection of appropriate methods. CONCLUSION Various methods have been proposed to evaluate medical test(s) in the absence of a gold standard for some or all participants in a diagnostic accuracy study. These methods depend on the availability of the gold standard, its' application to the participants in the study and the availability of alternative reference standard(s). The clinical application of some of these methods, especially methods developed when there is missing gold standard is however limited. This may be due to the complexity of these methods and/or a disconnection between the fields of expertise of those who develop (e.g. mathematicians) and those who employ the methods (e.g. clinical researchers). This review aims to help close this gap with our classification and guidance tools.
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Affiliation(s)
- Chinyereugo M. Umemneku Chikere
- Institute of Health & Society, Faculty of Medical Sciences Newcastle University, Newcastle upon Tyne, England, United Kingdom
| | - Kevin Wilson
- School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne, England, United Kingdom
| | - Sara Graziadio
- National Institute for Health Research, Newcastle In Vitro Diagnostics Co-operative, Newcastle upon Tyne Hospitals National Health Services Foundation Trust, Newcastle upon Tyne, England, United Kingdom
| | - Luke Vale
- Institute of Health & Society, Faculty of Medical Sciences Newcastle University, Newcastle upon Tyne, England, United Kingdom
| | - A. Joy Allen
- National Institute for Health Research, Newcastle In Vitro Diagnostics Co-operative, Newcastle University, Newcastle upon Tyne, England, United Kingdom
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Maze MJ, Sharples KJ, Allan KJ, Rubach MP, Crump JA. Diagnostic accuracy of leptospirosis whole-cell lateral flow assays: a systematic review and meta-analysis. Clin Microbiol Infect 2018; 25:437-444. [PMID: 30472422 DOI: 10.1016/j.cmi.2018.11.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 10/19/2018] [Accepted: 11/08/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND Leptospirosis is under-diagnosed by clinicians in many high-incidence countries, because reference diagnostic tests are largely unavailable. Lateral flow assays (LFA) that use antigen derived from heat-treated whole cell Leptospira biflexa serovar Patoc have the potential to improve leptospirosis diagnosis in resource-limited settings. OBJECTIVES We sought to summarize estimates of sensitivity and specificity of LFA by conducting a systematic review and meta-analysis of evaluations of the accuracy of LFA to diagnose human leptospirosis. DATA SOURCES On 4 July 2017 we searched three medical databases. Study eligibility criteriaArticles were included if they were a study of LFA sensitivity and specificity. PARTICIPANTS Patients with suspected leptospirosis. INTERVENTIONS Nil. METHODS For included articles, we assessed study quality, characteristics of participants and diagnostic testing methods. We estimated sensitivity and specificity for each study against the study-defined case definition as the reference standard, and performed a meta-analysis using a random-effects bivariate model. RESULTS Our search identified 225 unique reports, of which we included nine (4%) published reports containing 11 studies. We classified one (9%) study as high quality. Nine (82%) studies used reference tests with considerable risk of misclassification. Our pooled estimates of sensitivity and specificity were 79% (95% CI 70%-86%) and 92% (95% CI 85%-96%), respectively. CONCLUSIONS As the evidence base for determining the accuracy of LFA is small and at risk of bias, pooled estimates of sensitivity and specificity should be interpreted with caution. Further studies should use either reference tests with high sensitivity and specificity or statistical techniques that account for an imperfect reference standard.
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Affiliation(s)
- M J Maze
- Centre for International Health, University of Otago, New Zealand; Department of Medicine, University of Otago, Christchurch, New Zealand; Kilimanjaro Christian Medical Centre, Moshi, Tanzania.
| | - K J Sharples
- Department of Mathematics and Statistics, University of Otago, Dunedin, New Zealand
| | - K J Allan
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow, United Kingdom
| | - M P Rubach
- Kilimanjaro Christian Medical Centre, Moshi, Tanzania; Division of Infectious Diseases, Duke University Medical Center, Durham, NC, United States of America; Duke Global Health Institute, Duke University, Durham, NC, United States of America
| | - J A Crump
- Centre for International Health, University of Otago, New Zealand; Kilimanjaro Christian Medical Centre, Moshi, Tanzania; Division of Infectious Diseases, Duke University Medical Center, Durham, NC, United States of America; Duke Global Health Institute, Duke University, Durham, NC, United States of America
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22
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Moure Z, Rando-Segura A, Gimferrer L, Roig G, Pumarola T, Rodriguez-Garrido V. Evaluation of the novel DiaSorin LIAISON ® Campylobacter assay for the rapid detection of Campylobacter spp. Enferm Infecc Microbiol Clin 2018; 36:293-295. [DOI: 10.1016/j.eimc.2017.03.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 03/21/2017] [Accepted: 03/25/2017] [Indexed: 11/24/2022]
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Woods K, Nic-Fhogartaigh C, Arnold C, Boutthasavong L, Phuklia W, Lim C, Chanthongthip A, Tulsiani SM, Craig SB, Burns MA, Weier SL, Davong V, Sihalath S, Limmathurotsakul D, Dance DAB, Shetty N, Zambon M, Newton PN, Dittrich S. A comparison of two molecular methods for diagnosing leptospirosis from three different sample types in patients presenting with fever in Laos. Clin Microbiol Infect 2017; 24:1017.e1-1017.e7. [PMID: 29092789 PMCID: PMC6125144 DOI: 10.1016/j.cmi.2017.10.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 10/16/2017] [Accepted: 10/18/2017] [Indexed: 02/01/2023]
Abstract
OBJECTIVES To compare two molecular assays (rrs quantitative PCR (qPCR) versus a combined 16SrRNA and LipL32 qPCR) on different sample types for diagnosing leptospirosis in febrile patients presenting to Mahosot Hospital, Vientiane, Laos. METHODS Serum, buffy coat and urine samples were collected on admission, and follow-up serum ∼10 days later. Leptospira spp. culture and microscopic agglutination tests (MAT) were performed as reference standards. Bayesian latent class modelling was performed to estimate sensitivity and specificity of each diagnostic test. RESULTS In all, 787 patients were included in the analysis: 4/787 (0.5%) were Leptospira culture positive, 30/787 (3.8%) were MAT positive, 76/787 (9.7%) were rrs qPCR positive and 20/787 (2.5%) were 16SrRNA/LipL32 qPCR positive for pathogenic Leptospira spp. in at least one sample. Estimated sensitivity and specificity (with 95% CI) of 16SrRNA/LipL32 qPCR on serum (53.9% (33.3%-81.8%); 99.6% (99.2%-100%)), buffy coat (58.8% (34.4%-90.9%); 99.9% (99.6%-100%)) and urine samples (45.0% (27.0%-66.7%); 99.6% (99.3%-100%)) were comparable with those of rrs qPCR, except specificity of 16SrRNA/LipL32 qPCR on urine samples was significantly higher (99.6% (99.3%-100%) vs. 92.5% (92.3%-92.8%), p <0.001). Sensitivities of MAT (16% (95% CI 6.3%-29.4%)) and culture (25% (95% CI 13.3%-44.4%)) were low. Mean positive Cq values showed that buffy coat samples were more frequently inhibitory to qPCR than either serum or urine (p <0.001). CONCLUSIONS Serum and urine are better samples for qPCR than buffy coat, and 16SrRNA/LipL32 qPCR performs better than rrs qPCR on urine. Quantitative PCR on admission is a reliable rapid diagnostic tool, performing better than MAT or culture, with significant implications for clinical and epidemiological investigations of this global neglected disease.
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Affiliation(s)
- K Woods
- National Infection Service, Public Health England, London, UK; Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos.
| | - C Nic-Fhogartaigh
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos; Bart's Health Division of Infection, Pathology and Pharmacy Department, Royal London Hospital, London, UK
| | - C Arnold
- National Infection Service, Public Health England, London, UK
| | - L Boutthasavong
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos
| | - W Phuklia
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos
| | - C Lim
- Mahidol-Oxford-Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - A Chanthongthip
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos
| | - S M Tulsiani
- Queensland Health Forensic and Scientific Service, WHO Collaborating Centre for Reference and Research on Leptospirosis, Brisbane, Qld, Australia
| | - S B Craig
- Queensland Health Forensic and Scientific Service, WHO Collaborating Centre for Reference and Research on Leptospirosis, Brisbane, Qld, Australia; University of the Sunshine Coast, Faculty of Science Health, Education and Engineering, Sippy Downs, Qld, Australia; Faculty of Health, Queensland University of Technology, Brisbane, Qld, Australia
| | - M-A Burns
- Queensland Health Forensic and Scientific Service, WHO Collaborating Centre for Reference and Research on Leptospirosis, Brisbane, Qld, Australia
| | - S L Weier
- Faculty of Health, Queensland University of Technology, Brisbane, Qld, Australia
| | - V Davong
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos
| | - S Sihalath
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos
| | - D Limmathurotsakul
- Mahidol-Oxford-Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, England, UK
| | - D A B Dance
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, England, UK; Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
| | - N Shetty
- National Infection Service, Public Health England, London, UK
| | - M Zambon
- National Infection Service, Public Health England, London, UK
| | - P N Newton
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, England, UK
| | - S Dittrich
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Microbiology Laboratory, Mahosot Hospital, Vientiane, Laos; Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford, England, UK; Foundation for Innovative New Diagnostics, Geneva, Switzerland
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Ferraioli G, Tinelli C, De Silvestri A, Lissandrin R, Above E, Dellafiore C, Poma G, Di Gregorio M, Maiocchi L, Maserati R, Filice C. The clinical value of controlled attenuation parameter for the noninvasive assessment of liver steatosis. Liver Int 2016; 36:1860-1866. [PMID: 27439331 DOI: 10.1111/liv.13207] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Accepted: 07/13/2016] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS Ultrasound is the imaging modality most widely utilized in the general population for diagnostic purposes. Controlled attenuation parameter is a novel noninvasive method for assessing steatosis. Our aim was to investigate whether the clinical value of controlled attenuation parameter in patients referred for abdominal ultrasound examinations is affected by liver fibrosis. METHODS Consecutive patients referred for abdominal ultrasound examinations were enrolled. Controlled attenuation parameter and liver stiffness were assessed with the FibroScan (Echosens, France). Liver fibrosis was staged according to published cutoffs of liver stiffness measurements. Pearson's or Spearman's rank correlation coefficient was used to test the association between two study variables. Optimal cutoff of controlled attenuation parameter for diagnosing liver steatosis (S≥2) was 256 dB/m. The diagnostic performance and accuracy of dichotomized controlled attenuation parameter, ultrasound and body mass index were analysed using the imperfect gold standard methodology. RESULTS A total of 726 subjects (464 males and 262 females) were studied. Five hundred and eight-nine (81.1%) patients were affected by chronic viral hepatitis. Correlation of controlled attenuation parameter with ultrasound score was 0.48 and 0.57 in patients with and without chronic viral hepatitis respectively. In patients with chronic viral hepatitis, ultrasound, dichotomized controlled attenuation parameter and body mass index showed performance of 58.2%, 82.3% and 46.7%, respectively, whereas in patients without chronic viral hepatitis, the performance was 86.4%, 68.6% and 48.6% respectively. CONCLUSIONS In patients with chronic viral hepatitis and advanced liver fibrosis, controlled attenuation parameter performs better than ultrasound for assessing liver steatosis, whereas in patients without viral hepatitis and with nonsignificant liver disease ultrasound shows the best performance.
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Affiliation(s)
- Giovanna Ferraioli
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Carmine Tinelli
- Clinical Epidemiology and Biometric Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Annalisa De Silvestri
- Clinical Epidemiology and Biometric Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
| | - Raffaella Lissandrin
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Elisabetta Above
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Carolina Dellafiore
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Gianluigi Poma
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Marta Di Gregorio
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Laura Maiocchi
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Renato Maserati
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
| | - Carlo Filice
- Department of Infectious Diseases, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy
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Das S, Sarker S, Ghorashi SA, Forwood JK, Raidal SR. A comparison of PCR assays for beak and feather disease virus and high resolution melt (HRM) curve analysis of replicase associated protein and capsid genes. J Virol Methods 2016; 237:47-57. [PMID: 27565820 DOI: 10.1016/j.jviromet.2016.08.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 07/20/2016] [Accepted: 08/22/2016] [Indexed: 12/22/2022]
Abstract
Beak and feather disease virus (BFDV) threatens a wide range of endangered psittacine birds worldwide. In this study, we assessed a novel PCR assay and genetic screening method using high-resolution melt (HRM) curve analysis for BFDV targeting the capsid (Cap) gene (HRM-Cap) alongside conventional PCR detection as well as a PCR method that targets a much smaller fragment of the virus genome in the replicase initiator protein (Rep) gene (HRM-Rep). Limits of detection, sensitivity, specificity and discriminatory power for differentiating BFDV sequences were compared. HRM-Cap had a high positive predictive value and could readily differentiate between a reference genotype and 17 other diverse BFDV genomes with more discriminatory power (genotype confidence percentage) than HRM-Rep. Melt curve profiles generated by HRM-Cap correlated with unique DNA sequence profiles for each individual test genome. The limit of detection of HRM-Cap was lower (2×10-5ng/reaction or 48 viral copies) than that for both HRM-Rep and conventional BFDV PCR which had similar sensitivity (2×10-6ng or 13 viral copies/reaction). However, when used in a diagnostic setting with 348 clinical samples there was strong agreement between HRM-Cap and conventional PCR (kappa=0.87, P<0.01, 98% specificity) and HRM-Cap demonstrated higher specificity (99.9%) than HRM-Rep (80.3%).
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Affiliation(s)
- Shubhagata Das
- School of Animal and Veterinary Sciences, Faculty of Science, Charles Sturt University, NSW 2678, Australia.
| | - Subir Sarker
- School of Animal and Veterinary Sciences, Faculty of Science, Charles Sturt University, NSW 2678, Australia.
| | - Seyed Ali Ghorashi
- School of Animal and Veterinary Sciences, Faculty of Science, Charles Sturt University, NSW 2678, Australia.
| | - Jade K Forwood
- School of Biomedical Sciences, Faculty of Science, Charles Sturt University, Wagga Wagga, NSW 2650, Australia.
| | - Shane R Raidal
- School of Animal and Veterinary Sciences, Faculty of Science, Charles Sturt University, NSW 2678, Australia.
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Boots AW, Bos LD, van der Schee MP, van Schooten FJ, Sterk PJ. Exhaled Molecular Fingerprinting in Diagnosis and Monitoring: Validating Volatile Promises. Trends Mol Med 2016; 21:633-644. [PMID: 26432020 DOI: 10.1016/j.molmed.2015.08.001] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 07/23/2015] [Accepted: 08/04/2015] [Indexed: 12/19/2022]
Abstract
Medical diagnosis and phenotyping increasingly incorporate information from complex biological samples. This has promoted the development and clinical application of non-invasive metabolomics in exhaled air (breathomics). In respiratory medicine, expired volatile organic compounds (VOCs) are associated with inflammatory, oxidative, microbial, and neoplastic processes. After recent proof of concept studies demonstrating moderate to good diagnostic accuracies, the latest efforts in breathomics are focused on optimization of sensor technologies and analytical algorithms, as well as on independent validation of clinical classification and prediction. Current research strategies are revealing the underlying pathophysiological pathways as well as clinically-acceptable levels of diagnostic accuracy. Implementing recent guidelines on validating molecular signatures in medicine will enhance the clinical potential of breathomics and the development of point-of-care technologies.
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Affiliation(s)
- Agnes W Boots
- Department of Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands.
| | - Lieuwe D Bos
- Department of Respiratory Medicine, Academic Medical Centre, University of Medical Centre Amsterdam, The Netherlands
| | - Marc P van der Schee
- Department of Respiratory Medicine, Academic Medical Centre, University of Medical Centre Amsterdam, The Netherlands; Department of Pediatric Pulmonology, Emma's Children's Hospital, Academic Medical Centre Amsterdam, The Netherlands
| | - Frederik-Jan van Schooten
- Department of Toxicology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University, Maastricht, The Netherlands
| | - Peter J Sterk
- Department of Respiratory Medicine, Academic Medical Centre, University of Medical Centre Amsterdam, The Netherlands
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Optimal Cutoff and Accuracy of an IgM Enzyme-Linked Immunosorbent Assay for Diagnosis of Acute Scrub Typhus in Northern Thailand: an Alternative Reference Method to the IgM Immunofluorescence Assay. J Clin Microbiol 2016; 54:1472-1478. [PMID: 27008880 PMCID: PMC4879268 DOI: 10.1128/jcm.02744-15] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 03/08/2016] [Indexed: 01/03/2023] Open
Abstract
The enzyme-linked immunosorbent assay (ELISA) has been proposed as an alternative serologic diagnostic test to the indirect immunofluorescence assay (IFA) for scrub typhus. Here, we systematically determine the optimal sample dilution and cutoff optical density (OD) and estimate the accuracy of IgM ELISA using Bayesian latent class models (LCMs). Data from 135 patients with undifferentiated fever were reevaluated using Bayesian LCMs. Every patient was evaluated for the presence of an eschar and tested with a blood culture for Orientia tsutsugamushi, three different PCR assays, and an IgM IFA. The IgM ELISA was performed for every sample at sample dilutions from 1:100 to 1:102,400 using crude whole-cell antigens of the Karp, Kato, and Gilliam strains of O. tsutsugamushi developed by the Naval Medical Research Center. We used Bayesian LCMs to generate unbiased receiver operating characteristic curves and found that the sample dilution of 1:400 was optimal for the IgM ELISA. With the optimal cutoff OD of 1.474 at a sample dilution of 1:400, the IgM ELISA had a sensitivity of 85.7% (95% credible interval [CrI], 77.4% to 86.7%) and a specificity of 98.1% (95% CrI, 97.2% to 100%) using paired samples. For the ELISA, the OD could be determined objectively and quickly, in contrast to the reading of IFA slides, which was both subjective and labor-intensive. The IgM ELISA for scrub typhus has high diagnostic accuracy and is less subjective than the IgM IFA. We suggest that the IgM ELISA may be used as an alternative reference test to the IgM IFA for the serological diagnosis of scrub typhus.
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Hoffmaster AR, AuCoin D, Baccam P, Baggett HC, Baird R, Bhengsri S, Blaney DD, Brett PJ, Brooks TJG, Brown KA, Chantratita N, Cheng AC, Dance DAB, Decuypere S, Defenbaugh D, Gee JE, Houghton R, Jorakate P, Lertmemongkolchai G, Limmathurotsakul D, Merlin TL, Mukhopadhyay C, Norton R, Peacock SJ, Rolim DB, Simpson AJ, Steinmetz I, Stoddard RA, Stokes MM, Sue D, Tuanyok A, Whistler T, Wuthiekanun V, Walke HT. Melioidosis diagnostic workshop, 2013. Emerg Infect Dis 2015; 21. [PMID: 25626057 PMCID: PMC4313648 DOI: 10.3201/eid2102.141045] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Melioidosis is a severe disease that can be difficult to diagnose because of its diverse clinical manifestations and a lack of adequate diagnostic capabilities for suspected cases. There is broad interest in improving detection and diagnosis of this disease not only in melioidosis-endemic regions but also outside these regions because melioidosis may be underreported and poses a potential bioterrorism challenge for public health authorities. Therefore, a workshop of academic, government, and private sector personnel from around the world was convened to discuss the current state of melioidosis diagnostics, diagnostic needs, and future directions.
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Niloofa R, Fernando N, de Silva NL, Karunanayake L, Wickramasinghe H, Dikmadugoda N, Premawansa G, Wickramasinghe R, de Silva HJ, Premawansa S, Rajapakse S, Handunnetti S. Diagnosis of Leptospirosis: Comparison between Microscopic Agglutination Test, IgM-ELISA and IgM Rapid Immunochromatography Test. PLoS One 2015; 10:e0129236. [PMID: 26086800 PMCID: PMC4472754 DOI: 10.1371/journal.pone.0129236] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Accepted: 05/06/2015] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Leptospirosis is diagnosed on clinical grounds, and confirmed by microscopic agglutination test (MAT). IgM-ELISA (Serion-Virion) and immunochromatography test (Leptocheck-WB) are two immunodiagnostic assays for leptospirosis. Their sensitivity, specificity and applicability in Sri Lanka have not been systematically evaluated. METHODS Clinically diagnosed leptospirosis patients (n = 919) were recruited from three hospitals in the Western Province of Sri Lanka, during June 2012 to December 2013. MAT, IgM-ELISA and Leptocheck-WB were performed on all patient sera. MAT titer of ≥ 400 in single sample, four-fold rise or seroconversion ≥ 100 in paired samples were considered as positive for MAT. For diagnostic confirmation, MAT was performed during both acute and convalescent phases. Anti-leptospiral IgM ≥ 20 IU/ml and appearance of a band in the test window were considered as positive for IgM-ELISA and Leptocheck-WB test respectively. Patients with an alternative diagnosis (n = 31) were excluded. Data analysis was performed using two methods, i) considering MAT as reference standard and ii) using Bayesian latent class model analysis (BLCM) which considers each test as imperfect. RESULTS MAT, IgM-ELISA and Leptocheck-WB positivity were 39.8%, 45.8% and 38.7% respectively during the acute phase. Acute-phase MAT had specificity and sensitivity of 95.7% and 55.3% respectively, when compared to overall MAT positivity. IgM-ELISA and Leptocheck-WB had similar diagnostic sensitivity when compared with acute-phase MAT as the gold standard, although IgM-ELISA showed higher specificity (84.5%) than Leptocheck-WB (73.3%). BLCM analysis showed that IgM-ELISA and Leptocheck-WB had similar sensitivities (86.0% and 87.4%), while acute-phase MAT had the lowest sensitivity (77.4%). However, acute-phase MAT had high specificity (97.6%), while IgM-ELISA and Leptocheck-WB showed similar but lower specificity (84.5% and 82.9%). CONCLUSIONS Both IgM-ELISA and Leptocheck-WB shows similar sensitivities and specificities. IgM-ELISA may be superior to MAT during the acute phase and suitable for early diagnosis of leptospirosis. Leptocheck-WB is suitable as a rapid immunodiagnostic screening test for resource limited settings.
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Affiliation(s)
- Roshan Niloofa
- Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Colombo, Sri Lanka
| | - Narmada Fernando
- Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Colombo, Sri Lanka
| | | | - Lilani Karunanayake
- National Reference Laboratory for Leptospira, Medical Research Institute, Colombo, Sri Lanka
| | | | | | | | | | | | | | - Senaka Rajapakse
- Tropical Medicine Research Unit, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka
| | - Shiroma Handunnetti
- Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Colombo, Sri Lanka
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30
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Lim C, Paris DH, Blacksell SD, Laongnualpanich A, Kantipong P, Chierakul W, Wuthiekanun V, Day NPJ, Cooper BS, Limmathurotsakul D. How to Determine the Accuracy of an Alternative Diagnostic Test when It Is Actually Better than the Reference Tests: A Re-Evaluation of Diagnostic Tests for Scrub Typhus Using Bayesian LCMs. PLoS One 2015; 10:e0114930. [PMID: 26024375 PMCID: PMC4449177 DOI: 10.1371/journal.pone.0114930] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 11/18/2014] [Indexed: 11/18/2022] Open
Abstract
Background The indirect immunofluorescence assay (IFA) is considered a reference test for scrub typhus. Recently, the Scrub Typhus Infection Criteria (STIC; a combination of culture, PCR assays and IFA IgM) were proposed as a reference standard for evaluating alternative diagnostic tests. Here, we use Bayesian latent class models (LCMs) to estimate the true accuracy of each diagnostic test, and of STIC, for diagnosing scrub typhus. Methods/Principal Findings Data from 161 patients with undifferentiated fever were re-evaluated using Bayesian LCMs. Every patient was evaluated for the presence of an eschar, and tested with blood culture for Orientia tsutsugamushi, three different PCR assays, IFA IgM, and the Panbio IgM immunochromatographic test (ICT). True sensitivity and specificity of culture (24.4% and 100%), 56kDa PCR assay (56.8% and 98.4%), 47kDa PCR assay (63.2% and 96.1%), groEL PCR assay (71.4% and 93.0%), IFA IgM (70.0% and 83.8%), PanBio IgM ICT (72.8% and 96.8%), presence of eschar (42.7% and 98.9%) and STIC (90.5% and 82.5%) estimated by Bayesian LCM were considerably different from those obtained when using STIC as a reference standard. The IgM ICT had comparable sensitivity and significantly higher specificity compared to IFA (p=0.34 and p<0.001, respectively). Conclusions The low specificity of STIC was caused by the low specificity of IFA IgM. Neither STIC nor IFA IgM can be used as reference standards against which to evaluate alternative diagnostic tests. Further evaluation of new diagnostic tests should be done with a carefully selected set of diagnostic tests and appropriate statistical models.
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Affiliation(s)
- Cherry Lim
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Daniel H. Paris
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Stuart D. Blacksell
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | | | | | - Wirongrong Chierakul
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Vanaporn Wuthiekanun
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
| | - Nicholas P. J. Day
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Ben S. Cooper
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Centre for Tropical Medicine and Global Health, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
| | - Direk Limmathurotsakul
- Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- Department of Tropical Hygiene, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
- * E-mail:
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