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Evaluation of Loopamp™ Leishmania Detection Kit and Leishmania Antigen ELISA for Post-Elimination Detection and Management of Visceral Leishmaniasis in Bangladesh

Hossain, Faria, Picado, Albert, Owen, Sophie ORCID: https://orcid.org/0000-0002-0458-2357, Ghosh, Prakash, Chowdhury, Rajashree, Maruf, Shomik, Khan, Md. Anik Ashfaq, Rashid, Md. Utba, Nath, Rupen, Baker, James, Ghosh, Debashis, Adams, Emily ORCID: https://orcid.org/0000-0002-0816-2835, Duthie, Malcolm S., Hossain, Md. Sakhawat, Basher, Ariful, Nath, Proggananda, Aktar, Fatima, Cruz, Israel and Mondal, Dinesh (2021) 'Evaluation of Loopamp™ Leishmania Detection Kit and Leishmania Antigen ELISA for Post-Elimination Detection and Management of Visceral Leishmaniasis in Bangladesh'. Frontiers in Cellular and Infection Microbiology, Vol 11, p. 670759.

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Abstract

With reduced prevalence of visceral leishmaniasis (VL) in the Indian subcontinent (ISC), direct and field deployable diagnostic tests are needed to implement an effective diagnostic and surveillance algorithm for post-elimination VL control. In this regard, here we investigated the diagnostic efficacies of a loop-mediated isothermal amplification (LAMP) assay (Loopamp™ Leishmania Detection Kit, Eiken Chemical CO., Ltd, Japan), a real-time quantitative PCR assay (qPCR) and the Leishmania antigen ELISA (CLIN-TECH, UK) with different sampling techniques and evaluated their prospect to incorporate into post-elimination VL control strategies. Eighty clinically and rK39 rapid diagnostic test confirmed VL cases and 80 endemic healthy controls were enrolled in the study. Peripheral blood and dried blood spots (DBS) were collected from all the participants at the time of diagnosis. DNA was extracted from whole blood (WB) and DBS via silica columns (QIAGEN) and boil & spin (B&S) methods and tested with qPCR and Loopamp. Urine was collected from all participants at the time of diagnosis and was directly subjected to the Leishmania antigen ELISA. 41 patients were followed up and urine samples were collected at day 30 and day 180 after treatment and ELISA was performed. The sensitivities of the Loopamp-WB(B&S) and Loopamp-WB(QIA) were 96.2% (95% CI 89·43-99·22) and 95% (95% CI 87·69-98·62) respectively. The sensitivity of Loopamp-DBS(QIA) was 85% (95% CI 75·26- 92·00). The sensitivities of the qPCR-WB(QIA) and qPCR-DBS(QIA) were 93.8% (95% CI 86·01-97·94) and 72.5% (95% CI 61·38-81·90) respectively. The specificity of all molecular assays was 100%. The sensitivity and specificity of the Leishmania antigen ELISA were 97.5% (95% CI 91·47-99·70) and 91.95% (95% CI 84·12-96·70) respectively. The Leishmania antigen ELISA depicted clinical cure at day 180 in all the followed-up cases. Efficacy and sustainability identify the Loopamp-WB(B&S) and the Leishmania antigen ELISA as promising and minimally invasive VL diagnostic tools to support VL diagnostic and surveillance activities respectively in the post-elimination era.

Item Type: Article
Subjects: QU Biochemistry > Genetics > QU 550 Genetic techniques. PCR. Chromosome mapping
WA Public Health > Health Problems of Special Population Groups > WA 395 Health in developing countries
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 680 Tropical diseases (General)
WC Communicable Diseases > Tropical and Parasitic Diseases > WC 715 Visceral leishmaniasis
Faculty: Department: Biological Sciences > Department of Tropical Disease Biology
Digital Object Identifer (DOI): https://doi.org/10.3389/fcimb.2021.670759
Depositing User: Marie Hatton
Date Deposited: 14 May 2021 13:29
Last Modified: 14 May 2021 13:29
URI: https://archive.lstmed.ac.uk/id/eprint/17854

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