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Handley BL, González-Beiras C, Tchatchouang S, Basing LA, Hugues KA, Bakheit M, Becherer L, Ries C, Njih Tabah E, Crucitti T, Borst N, Lüert S, Frischmann S, Haerpfer T, Landmann E, Amanor I, Sylla A, Kouamé-Sina MS, Ndzomo-Ngono JP, Tano A, Arhinful D, Awondo P, Ngazoa Kakou S, Eyangoh S, Addo KK, Harding-Esch EM, Knauf S, Mitjà O, Marks M. LAMP4yaws: Treponema pallidum, Haemophilus ducreyi loop mediated isothermal amplification - protocol for a cross-sectional, observational, diagnostic accuracy study. BMJ Open 2022; 12:e058605. [PMID: 35351731 PMCID: PMC8966536 DOI: 10.1136/bmjopen-2021-058605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
INTRODUCTION Yaws, caused by the bacterium Treponema pallidum subsp. pertenue, is a neglected tropical disease targeted for eradication by 2030. Improved diagnostics will be essential to meet this goal. Diagnosis of yaws has relied heavily on clinical and serological tools. However, the presence of coendemic cutaneous skin ulcer diseases, such as lesions caused by Haemophilus ducreyi (HD), means these techniques do not provide a reliable diagnosis. Thus, new diagnostic tools are needed. Molecular tools such as PCR are ideal, but often expensive as they require trained technicians and laboratory facilities, which are often not available to national yaws programmes. METHODS AND ANALYSIS The LAMP4yaws project is a cross-sectional, observational, diagnostic accuracy study of a combined Treponema pallidum (TP) and HD loop mediated isothermal amplification (TPHD-LAMP) test performed under real world conditions in three endemic countries in West Africa. Individuals with serologically confirmed yaws will be recruited in Cameroon, Côte d'Ivoire and Ghana. Each participant will provide paired swabs, one of which will be sent to the respective national reference laboratory for yaws quantitative PCR and the other will be tested for both TP and HD using the TPHD-LAMP test at local district laboratories. Sensitivity and specificity of the TPHD-LAMP test will be calculated against the reference standard qPCR. We will also assess the acceptability, feasibility and cost-effectiveness of the test. We anticipate that results from this study will support the adoption of the TPHD-LAMP test for use in global yaws eradication efforts. ETHICS AND DISSEMINATION We have received ethical approval from all relevant institutional and national ethical committees. All participants, or their parents or guardians, must provide written informed consent prior to study enrolment. Study results will be published in an open access journal and disseminated with partners and the World Health Organization. TRIAL REGISTRATION NUMBER NCT04753788.
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Affiliation(s)
- Becca Louise Handley
- Clinical Research Department, London School of Hygiene and Tropical Medicine Faculty of Infectious and Tropical Diseases, London, UK
| | - Camila González-Beiras
- Department of Infectious Diseases, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
| | | | - Laud Antony Basing
- University of Ghana Noguchi Memorial Institute for Medical Research, Accra, Greater Accra, Ghana
| | - Kouadio Aboh Hugues
- National Program of African Trypanosomiasis Elimination, Abidjan, Côte d'Ivoire
- Institut Pasteur de Cote d'Ivoire, Abidjan, Lagunes, Côte d'Ivoire
| | | | - Lisa Becherer
- IMTEK - Department of Microsystems Engineering, University of Freiburg, Freiburg im Breisgau, Germany
| | - Christina Ries
- Institute of International Animal Health/One Health, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald - Insel Riems, Germany
| | - Earnest Njih Tabah
- National Buruli Ulcer, Leprosy, Yaws and Leishmaniasis Control Program, Ministry of Public Health, Yaounde, Centre Region, Cameroon
- Public Health & Epidemiology, University of Dschang, Yaounde, West Region, Cameroon
| | - Tania Crucitti
- Experimental Bacteriology Unit, Institut Pasteur de Madagascar, Antananarivo, Madagascar
| | - Nadine Borst
- IMTEK - Department of Microsystems Engineering, University of Freiburg, Freiburg im Breisgau, Germany
| | - Simone Lüert
- Institute of International Animal Health/One Health, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald - Insel Riems, Germany
| | | | - Tamara Haerpfer
- IMTEK - Department of Microsystems Engineering, University of Freiburg, Freiburg im Breisgau, Germany
| | | | - Ivy Amanor
- University of Ghana Noguchi Memorial Institute for Medical Research, Accra, Greater Accra, Ghana
| | - Aboubacar Sylla
- Institut Pasteur de Cote d'Ivoire, Abidjan, Lagunes, Côte d'Ivoire
| | | | | | - Adingra Tano
- Institut Pasteur de Cote d'Ivoire, Abidjan, Lagunes, Côte d'Ivoire
| | - Daniel Arhinful
- University of Ghana Noguchi Memorial Institute for Medical Research, Accra, Greater Accra, Ghana
| | | | | | | | - Kennedy Kwasi Addo
- Noguchi Memorial Institute for Medical Research, University of Ghana, Legon, Ghana
| | - Emma Michele Harding-Esch
- Clinical Research Department, London School of Hygiene and Tropical Medicine Faculty of Infectious and Tropical Diseases, London, UK
| | - Sascha Knauf
- Institute of International Animal Health/One Health, Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Greifswald - Insel Riems, Germany
| | - Oriol Mitjà
- Department of Infectious Diseases, Hospital Universitari Germans Trias i Pujol, Badalona, Spain
| | - Michael Marks
- Clinical Research Department, London School of Hygiene and Tropical Medicine Faculty of Infectious and Tropical Diseases, London, UK
- Hospital for Tropical Diseases, London, UK
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