Tandem Use of OvMANE1 and Ov-16 ELISA Tests Increases the Sensitivity for the Diagnosis of Human Onchocerciasis

Cabirou Mounchili Shintouo, Stephen Mbigha Ghogomu, Robert Adamu Shey, An Hotterbeekx , Emel Yagmur , Tony Mets, Luc Vanhamme, Robert Colebunders, Jacob Souopgui, Rose Njemini

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Abstract

The current serological test for human onchocerciasis relies on IgG4 reactivity against the parasite Ov-16 antigen, with reported sensitivities of only 60–80%. As control programs move from control to elimination, it is imperative to identify novel molecules that could improve the serodiagnosis reliability of this disease. In this study we compared the sensitivity of total IgG against OvMANE1—a chimeric antigen previously identified as a potential biomarker of human onchocerciasis—with that of an Ov-16 antibody test to detect an Onchocerca volvulus infection in persons presenting with microfilaria in skin snips. One hundred and ninety serum samples were obtained from persons with epilepsy in an onchocerciasis-endemic area at Ituri in the Democratic Republic of Congo where ivermectin has never been distributed. Fifty-nine (31.1%) samples were from individuals with a positive skin snip test; 41 (69.5%) of these 59 samples were positive with the OvMANE1 test and 41 (69.5%) with the Ov-16 test; 30 (50.8%) samples were positive for both tests and in 52 (88.1%) at least one of the tests was positive. Testing the 131 sera from persons with a negative skin snip result revealed that 63 (48.1%) were positive exclusively with the OvMANE1 test, 13 (9.9%) exclusively with the Ov-16 test and 25 (19.1%) with both tests. Nine European samples from individuals without past travel history in onchocerciasis endemic zones and 15 samples from Rwanda, a hypoendemic country for onchocerciasis were all negative for the OvMANE1 and Ov-16 tests. However, the specificity of both tests was difficult to determine due to the lack of a gold standard for antibody tests. In conclusion, the tandem use of OvMANE1 and Ov-16 tests improves the sensitivity of detecting Onchocerca volvulus seropositive individuals but, the OvMANE1 test needs to be further evaluated on samples from a population infected with other helminths to cautiously address its specificity.
Original languageEnglish
Article number1284
Number of pages10
JournalLife
Volume11
Issue number12
DOIs
Publication statusPublished - Dec 2021

Bibliographical note

Funding Information:
This research was funded by ERC grant 671055 and VLIR-UOS through the Global Minds Joint PhD between Vrije Universiteit Brussel, Belgium and University of Buea, Cameroon. The “Académie de Recherche et d’Enseignement Supérieur (ARES)”, grant number “ARES-PRD2013& 2020Cameroun” to J.S. The United States Agency for International Development (USAID) and UK FCDO from the British people (UK FCDO) through the Coalition for Operational Research on Neglected Tropical Diseases (COR-NTD) and administered by the African Research Network for Neglected Tropical Diseases (ARNTD). Its contents are solely the responsibility of the authors and do not necessarily represent the views of USAID, UK FCDO, COR-NTD or the ARNTD.Acknowledgments: Luc Vanhamme is the Director of Research of the Belgian National Fund for Scientific Research (FNRS).

Funding Information:
Funding: This research was funded by ERC grant 671055 and VLIR-UOS through the Global Minds Joint PhD between Vrije Universiteit Brussel, Belgium and University of Buea, Cameroon. The “Académie de Recherche et d’Enseignement Supérieur (ARES)”, grant number “ARES-PRD2013& 2020Cameroun” to J.S. The United States Agency for International Development (USAID) and UK FCDO from the British people (UK FCDO) through the Coalition for Operational Research on Neglected Tropical Diseases (COR-NTD) and administered by the African Research Network for Neglected Tropical Diseases (ARNTD). Its contents are solely the responsibility of the authors and do not necessarily represent the views of USAID, UK FCDO, COR-NTD or the ARNTD.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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