Comparison of one single-antigen assay and three multi-antigen SARS-CoV-2 IgG assays in Nigeria.
Nnaemeka C Iriemenam, Fehintola A Ige, Stacie M Greby, Olumide O Okunoye, Mabel Uwandu, Maureen Aniedobe, Stephnie O Nwaiwu, Nwando Mba, Mary Okoli, Nwachukwu E William, Akipu Ehoche, Augustine Mpamugo, Andrew Mitchell, Kristen A Stafford, Andrew N Thomas, Temitope Olaleye, Oluwaseun O Akinmulero, Ndidi P Agala, Ado G Abubakar, Ajile Owens, Sarah E Gwyn, Eric Rogier, Venkatachalam Udhayakumar, Laura C Steinhardt, Diana L Martin, McPaul I Okoye, Rosemary Audu
Author Information
Nnaemeka C Iriemenam: Division of Global HIV and TB, Center for Global Health, Centers for Disease Control and Prevention, Abuja, Nigeria.
Fehintola A Ige: Center for Human Virology and Genomics, Microbiology Department, Nigerian Institute of Medical Research, Yaba, Lagos, Nigeria.
Stacie M Greby: Division of Global HIV and TB, Center for Global Health, Centers for Disease Control and Prevention, Abuja, Nigeria.
Olumide O Okunoye: Division of Global HIV and TB, Center for Global Health, Centers for Disease Control and Prevention, Abuja, Nigeria.
Mabel Uwandu: Center for Human Virology and Genomics, Microbiology Department, Nigerian Institute of Medical Research, Yaba, Lagos, Nigeria.
Maureen Aniedobe: Center for Human Virology and Genomics, Microbiology Department, Nigerian Institute of Medical Research, Yaba, Lagos, Nigeria.
Stephnie O Nwaiwu: Center for Human Virology and Genomics, Microbiology Department, Nigerian Institute of Medical Research, Yaba, Lagos, Nigeria.
Nwando Mba: Nigeria Centre for Disease Control (NCDC), Gaduwa, FCT, Nigeria.
Mary Okoli: Nigeria Centre for Disease Control (NCDC), Gaduwa, FCT, Nigeria.
Nwachukwu E William: Nigeria Centre for Disease Control (NCDC), Gaduwa, FCT, Nigeria.
Akipu Ehoche: University of Maryland Center for International Health, Education, and Biosecurity (CIHEB), Maryland Global Initiatives Corporation (MGIC), FCT, Nigeria.
Augustine Mpamugo: University of Maryland Center for International Health, Education, and Biosecurity (CIHEB), Maryland Global Initiatives Corporation (MGIC), FCT, Nigeria.
Andrew Mitchell: Center for International Health, Education, and Biosecurity, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, USA.
Kristen A Stafford: Center for International Health, Education, and Biosecurity, Institute of Human Virology, University of Maryland School of Medicine, Baltimore, USA.
Andrew N Thomas: International Research Center of Excellence, Institute of Human Virology, Abuja, Nigeria.
Temitope Olaleye: International Research Center of Excellence, Institute of Human Virology, Abuja, Nigeria.
Oluwaseun O Akinmulero: International Research Center of Excellence, Institute of Human Virology, Abuja, Nigeria.
Ndidi P Agala: International Research Center of Excellence, Institute of Human Virology, Abuja, Nigeria.
Ado G Abubakar: International Research Center of Excellence, Institute of Human Virology, Abuja, Nigeria.
Ajile Owens: Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Sarah E Gwyn: Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Eric Rogier: Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Venkatachalam Udhayakumar: Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Laura C Steinhardt: Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Diana L Martin: Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA.
McPaul I Okoye: Division of Global HIV and TB, Center for Global Health, Centers for Disease Control and Prevention, Abuja, Nigeria.
Rosemary Audu: Center for Human Virology and Genomics, Microbiology Department, Nigerian Institute of Medical Research, Yaba, Lagos, Nigeria.
Objectives: Determining an accurate estimate of SARS-CoV-2 seroprevalence has been challenging in African countries where malaria and other pathogens are endemic. We compared the performance of one single-antigen assay and three multi-antigen SARS-CoV-2 IgG assays in a Nigerian population endemic for malaria. Methods: De-identified plasma specimens from SARS-CoV-2 RT-PCR positive, dried blood spot (DBS) SARS-CoV-2 RT-PCR positive, and pre-pandemic negatives were used to evaluate the performance of the four SARS-CoV-2 assays (Tetracore, SARS2MBA, RightSign, xMAP). Results: Results showed higher sensitivity with the multi-antigen (81% (Tetracore), 96% (SARS2MBA), 85% (xMAP)) versus the single-antigen (RightSign (64%)) SARS-CoV-2 assay. The overall specificities were 98% (Tetracore), 100% (SARS2MBA and RightSign), and 99% (xMAP). When stratified based on <15 days to ≥15 days post-RT-PCR confirmation, the sensitivities increased from 75% to 88.2% for Tetracore; from 93% to 100% for the SARS2MBA; from 58% to 73% for RightSign; and from 83% to 88% for xMAP. With DBS, there was no positive increase after 15-28 days for the three assays (Tetracore, SARS2MBA, and xMAP). Conclusion: Multi-antigen assays performed well in Nigeria, even with samples with known malaria reactivity, and might provide more accurate measures of COVID-19 seroprevalence and vaccine efficacy.