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Li NS, Hsu YP, Pang HH, Wang SF, Pang ST, Lin CY, Tsai RY, Huang CY, Wei KC, Yang HW. Lab-in-a-Vial Rapid Test for Internet of Things-Embedded Point-of-Healthcare Protein Biomarker Detection in Bodily Fluids. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2400878. [PMID: 39105375 DOI: 10.1002/smll.202400878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 06/25/2024] [Indexed: 08/07/2024]
Abstract
Amateurs often struggle with detecting and quantifying protein biomarkers in body fluids due to the high expertise required. This study introduces a Lab-in-a-Vial (LV) rapid diagnostic platform, featuring hydrangea-like platinum nanozymes (PtNH), for rapid, accurate detection and quantification of protein biomarkers on-site within 15 min. This method significantly enhances detection sensitivity for various biomarkers in body fluids, surpassing traditional methods such as enzyme-linked immunosorbent assays (ELISA) and lateral flow assays (LFA) by ≈250 to 1300 times. The LV platform uses a glass vial coated with specific bioreceptors such as antigens or antibodies, enabling rapid in vitro evaluation of disease risk from small fluid samples, similar to a personal ELISA-like point-of-care test (POCT). It overcomes challenges in on-site biomarker detection, allowing both detection and quantification through a portable wireless spectrometer for healthcare internet of things (H-IoT). The platform's effectiveness and adaptability are confirmed using IgG/IgM antibodies from SARS-CoV-2 infected patients and nuclear matrix protein (NMP22) from urothelial carcinoma (UC) patients as biomarkers. These tests demonstrated its accuracy and flexibility. This approach offers vast potential for diverse disease applications, provided that the relevant protein biomarkers in bodily fluids are identified.
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Affiliation(s)
- Nan-Si Li
- Department of Biomedical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Ying-Pei Hsu
- Department of Materials and Optoelectronic Science, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
| | - Hao-Han Pang
- Department of Biomedical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Sheng-Fan Wang
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan
- Center for Tropical Medicine and Infectious Diseases Research, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan
| | - See-Tong Pang
- Division of Urology, Department of Surgery, Chang Gung Memorial Hospital Linkou, Taoyuan, 33305, Taiwan
- Department of Medicine, College of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan
| | - Chih-Yen Lin
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, 80708, Taiwan
| | | | - Chiung-Yin Huang
- Department of Neurosurgery, Neuroscience Research Center, Chang Gung Memorial Hospital Linkou, Taoyuan, 33305, Taiwan
- Department of Neurosurgery, New Taipei Municipal TuCheng Hospital, Taoyuan, 23652, Taiwan
| | - Kuo-Chen Wei
- Department of Medicine, College of Medicine, Chang Gung University, Taoyuan, 33302, Taiwan
- Department of Neurosurgery, Neuroscience Research Center, Chang Gung Memorial Hospital Linkou, Taoyuan, 33305, Taiwan
- Department of Neurosurgery, New Taipei Municipal TuCheng Hospital, Taoyuan, 23652, Taiwan
| | - Hung-Wei Yang
- Department of Biomedical Engineering, National Cheng Kung University, Tainan, 70101, Taiwan
- Medical Device Innovation Center, National Cheng Kung University, No. 1, University Rd., Tainan City, 70101, Taiwan
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Serwanga J, Oluka GK, Baine C, Ankunda V, Sembera J, Kato L, Katende JS, Odoch G, Auma BO, Gombe B, Musenero M, Kaleebu P. Persistent and robust antibody responses to ChAdOx1-S Oxford-AstraZeneca (ChAdOx1-S, Covishield) SARS-CoV-2 vaccine observed in Ugandans across varied baseline immune profiles. PLoS One 2024; 19:e0303113. [PMID: 39074077 DOI: 10.1371/journal.pone.0303113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Accepted: 04/18/2024] [Indexed: 07/31/2024] Open
Abstract
Understanding SARS-CoV-2 vaccine-induced antibody responses in varied antigenic and serological prior exposures can guide optimal vaccination strategies for enhanced immunogenicity. We evaluated spike (S)-directed IgG, IgM, and IgA antibody optical densities (ODs) and concentrations to the two-dose ChAdOx1-S Oxford-AstraZeneca (ChAdOx1-S, Covishield) SARS-CoV-2 vaccine in 67 Ugandans, categorised by prior infection and baseline S-IgG histories: uninfected and S-IgG-negative (n = 12); previously infected yet S-IgG-negative (n = 17); and previously infected with S-IgG-positive status (n = 38). Antibody dynamics were compared across eight timepoints from baseline till nine months. S-IgG antibodies remained consistently potent across all groups. Individuals with prior infections maintained robust S-IgG levels, underscoring the endurance of hybrid immunity. In contrast, those without prior exposure experienced an initial surge in S-IgG after the primary dose but no subsequent significant increase post-boost. However, they reached levels parallel to the previously exposed groups. S-IgM levels remained moderate, while S-IgA persisted in individuals with prior antigen exposure. ChAdOx1-S, Covishield vaccine elicited robust and sustained antibody responses in recipients, irrespective of their initial immune profiles. Hybrid immunity showed higher responses, aligning with global observations. Early post-vaccination antibody levels could predict long-term immunity, particularly in individuals without virus exposure. These findings can inform vaccine strategies and pandemic management.
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Affiliation(s)
- Jennifer Serwanga
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jackson Sembera
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Laban Kato
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Geoffrey Odoch
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Betty Oliver Auma
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Ben Gombe
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Monica Musenero
- Science, Technology, and Innovation Secretariat, Office of the President, Government of Uganda, Kampala, Uganda
| | - Pontiano Kaleebu
- Viral Pathogens Theme, MRC/UVRI & London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
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Zhuang Y, Ouyang Y, Ding L, Xu M, Shi F, Shan D, Cao D, Cao X. Source Tracing of Kidney Injury via the Multispectral Fingerprint Identified by Machine Learning-Driven Surface-Enhanced Raman Spectroscopic Analysis. ACS Sens 2024; 9:2622-2633. [PMID: 38700898 DOI: 10.1021/acssensors.4c00407] [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] [Indexed: 05/25/2024]
Abstract
Early diagnosis of drug-induced kidney injury (DIKI) is essential for clinical treatment and intervention. However, developing a reliable method to trace kidney injury origins through retrospective studies remains a challenge. In this study, we designed ordered fried-bun-shaped Au nanocone arrays (FBS NCAs) to create microarray chips as a surface-enhanced Raman scattering (SERS) analysis platform. Subsequently, the principal component analysis (PCA)-two-layer nearest neighbor (TLNN) model was constructed to identify and analyze the SERS spectra of exosomes from renal injury induced by cisplatin and gentamycin. The established PCA-TLNN model successfully differentiated the SERS spectra of exosomes from renal injury at different stages and causes, capturing the most significant spectral features for distinguishing these variations. For the SERS spectra of exosomes from renal injury at different induction times, the accuracy of PCA-TLNN reached 97.8% (cisplatin) and 93.3% (gentamicin). For the SERS spectra of exosomes from renal injury caused by different agents, the accuracy of PCA-TLNN reached 100% (7 days) and 96.7% (14 days). This study demonstrates that the combination of label-free exosome SERS and machine learning could serve as an innovative strategy for medical diagnosis and therapeutic intervention.
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Affiliation(s)
- Yanwen Zhuang
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou 225001, P. R. China
| | - Yu Ouyang
- Department of Clinical Laboratory, The Affiliated Taizhou Second People's Hospital of Yangzhou University, Taizhou 225300, P. R. China
| | - Li Ding
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou 225001, P. R. China
| | - Miaowen Xu
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou 225001, P. R. China
| | - Fanfeng Shi
- Yangzhou Polytechnic Institute, Yangzhou 225002, P. R. China
| | - Dan Shan
- School of Information Engineering/Carbon Based Low Dimensional Semiconductor Materials and Device Engineering Research Center of Jiangsu Province, Yangzhou Polytechnic Institute, Yangzhou 225127, P. R. China
| | - Dawei Cao
- Yangzhou Polytechnic Institute, Yangzhou 225002, P. R. China
- School of Information Engineering/Carbon Based Low Dimensional Semiconductor Materials and Device Engineering Research Center of Jiangsu Province, Yangzhou Polytechnic Institute, Yangzhou 225127, P. R. China
| | - Xiaowei Cao
- Institute of Translational Medicine, Medical College, Yangzhou University, Yangzhou 225001, P. R. China
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Medical College, Yangzhou University, Yangzhou 225001, P. R. China
- Jiangsu Key Laboratory of Experimental & Translational Non-coding RNA Research, Medical College, Yangzhou University, Yangzhou 225001, P. R. China
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Serwanga J, Kato L, Oluka GK, Ankunda V, Sembera J, Baine C, Kitabye I, Namuyanja A, Opio S, Katende JS, Ejou P, Kaleebu P. The single-dose Janssen Ad26.COV2.S COVID-19 vaccine elicited robust and persistent anti-spike IgG antibody responses in a 12-month Ugandan cohort. Front Immunol 2024; 15:1384668. [PMID: 38779677 PMCID: PMC11109398 DOI: 10.3389/fimmu.2024.1384668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Accepted: 04/22/2024] [Indexed: 05/25/2024] Open
Abstract
Introduction The study investigation examined the immune response to the Janssen Ad26.COV2.S COVID-19 vaccine within a Ugandan cohort, specifically targeting antibodies directed against spike (S) and nucleocapsid (N) proteins. We aimed to examine the durability and robustness of the induced antibody response while also assessing occurrences of breakthrough infections and previous anti-Spike seropositivity to SARS-CoV-2. Methods The study included 319 specimens collected over 12 months from 60 vaccinees aged 18 to 64. Binding antibodies were quantified using a validated ELISA method to measure SARS-CoV-2-specific IgG, IgM, and IgA levels against the S and N proteins. Results The results showed that baseline seropositivity for S-IgG was high at 67%, increasing to 98% by day 14 and consistently stayed above 95% for up to 12 months. However, S-IgM responses remained suboptimal. A raised S-IgA seropositivity rate was seen that doubled from 40% at baseline to 86% just two weeks following the initial vaccine dose, indicating sustained and robust peripheral immunity. An increase in N-IgG levels at nine months post-vaccination suggested breakthrough infections in eight cases. Baseline cross-reactivity influenced spike-directed antibody responses, with individuals harbouring S-IgG antibodies showing notably higher responses. Discussion Robust and long lasting vaccine and infection-induced immune responses were observed, with significant implications for regions where administering subsequent doses poses logistical challenges.
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Affiliation(s)
- Jennifer Serwanga
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Laban Kato
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Violet Ankunda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Jackson Sembera
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Claire Baine
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Isaac Kitabye
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Angela Namuyanja
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Solomon Opio
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Peter Ejou
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - The COVID-19 Immunoprofiling Team
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Pontiano Kaleebu
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
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Ankunda V, Katende JS, Oluka GK, Sembera J, Baine C, Odoch G, Ejou P, Kato L, Kaleebu P, Serwanga J. The subdued post-boost spike-directed secondary IgG antibody response in Ugandan recipients of the Pfizer-BioNTech BNT162b2 vaccine has implications for local vaccination policies. Front Immunol 2024; 15:1325387. [PMID: 38469296 PMCID: PMC10926532 DOI: 10.3389/fimmu.2024.1325387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Accepted: 01/31/2024] [Indexed: 03/13/2024] Open
Abstract
Introduction This study aimed to delineate longitudinal antibody responses to the Pfizer-BioNTech BNT162b2 COVID-19 vaccine within the Ugandan subset of the Sub-Saharan African (SSA) demographic, filling a significant gap in global datasets. Methods We enrolled 48 participants and collected 320 specimens over 12 months after the primary vaccination dose. A validated enzyme-linked immunosorbent assay (ELISA) was used to quantify SARS-CoV-2-specific IgG, IgM, and IgA antibody concentrations (ng/ml) and optical densities (ODs). Statistical analyses included box plots, diverging bar graphs, and the Wilcoxon test with Bonferroni correction. Results We noted a robust S-IgG response within 14 days of the primary vaccine dose, which was consistent with global data. There was no significant surge in S-IgG levels after the booster dose, contrasting trends in other global populations. The S-IgM response was transient and predominantly below established thresholds for this population, which reflects its typical early emergence and rapid decline. S-IgA levels rose after the initial dose then decreased after six months, aligning with the temporal patterns of mucosal immunity. Eleven breakthrough infections were noted, and all were asymptomatic, regardless of the participants' initial S-IgG serostatus, which suggests a protective effect from vaccination. Discussion The Pfizer-BioNTech BNT162b2 COVID-19 vaccine elicited strong S-IgG responses in the SSA demographic. The antibody dynamics distinctly differed from global data highlighting the significance of region-specific research and the necessity for customised vaccination strategies.
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Affiliation(s)
- Violet Ankunda
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jackson Sembera
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Claire Baine
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Geoffrey Odoch
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Peter Ejou
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Laban Kato
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Pontiano Kaleebu
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jennifer Serwanga
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
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Serwanga J, Ankunda V, Katende JS, Baine C, Oluka GK, Odoch G, Nantambi H, Mugaba S, Namuyanja A, Ssali I, Ejou P, Kato L, Musenero M, Kaleebu P. Sustained S-IgG and S-IgA antibodies to Moderna's mRNA-1273 vaccine in a Sub-Saharan African cohort suggests need for booster timing reconsiderations. Front Immunol 2024; 15:1348905. [PMID: 38357547 PMCID: PMC10864610 DOI: 10.3389/fimmu.2024.1348905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2023] [Accepted: 01/12/2024] [Indexed: 02/16/2024] Open
Abstract
Introduction This study sought to elucidate the long-term antibody responses to the Moderna mRNA-1273 COVID-19 vaccine within a Ugandan cohort, aiming to contribute to the sparse data on m-RNA vaccine immunogenicity in Sub-Saharan Africa. Methods We tracked the development and persistence of the elicited antibodies in 19 participants aged 18 to 67, who received two doses of the mRNA-1273 vaccine. A validated enzyme-linked immunosorbent assay (ELISA) was used to quantify SARS-CoV-2-specific IgG, IgM, and IgA antibodies against the spike (S) and nucleoproteins (N). The study's temporal scope extended from the baseline to one year, capturing immediate and long-term immune responses. Statistical analyses were performed using the Wilcoxon test to evaluate changes in antibody levels across predetermined intervals with the Hochberg correction for multiple comparisons. Results Our results showed a significant initial rise in spike-directed IgG (S-IgG) and spike-directed IgA (S-IgA) levels, which remained elevated for the duration of the study. The S-IgG concentrations peaked 14 days afterboosting, while spike-directed IgM (S-IgM) levels were transient, aligning with their early response role. Notably, post-booster antibody concentrations did not significantly change. Prior S-IgG status influenced the post-priming S-IgA dynamics, with baseline S-IgG positive individuals maintaining higher S-IgA responses, a difference that did not reach statistical difference post-boost. Three instances of breakthrough infections: two among participants who exhibited baseline seropositivity for S-IgG, and one in a participant initially seronegative for S-IgG. Discussion In conclusion, the mRNA-1273 vaccine elicited robust and persistent S-IgG and S-IgA antibody responses, particularly after the first dose, indicating potential for long-term immunity. Prior viral exposure enhances post-vaccination S-IgA responses compared to naive individuals, which aligned with the prior-naïve, post-boost. The stable antibody levels observed post-booster dose, remaining high over an extended period, with no significant secondary rise, and no difference by baseline exposure, suggest that initial vaccination may sufficiently prime the immune system for prolonged protection in this population, allowing for potential to delay booster schedules as antibody responses remained high at the time of boosting. This finding calls for a reassessment of the booster dose scheduling in this demographic.
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Affiliation(s)
- Jennifer Serwanga
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Geoffrey Odoch
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Hellen Nantambi
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Susan Mugaba
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Angella Namuyanja
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Ivan Ssali
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Peter Ejou
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Laban Kato
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Monica Musenero
- Science, Technology, and Innovation Secretariat, Office of the President, Government of Uganda, Kampala, Uganda
| | - Pontiano Kaleebu
- Viral Pathogens Research Theme, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
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Baine C, Sembera J, Kevin Oluka G, Katende JS, Ankunda V, Serwanga J. An Optimised Indirect ELISA Protocol for Detection and Quantification of Anti-viral Antibodies in Human Plasma or Serum: A Case Study Using SARS-CoV-2. Bio Protoc 2023; 13:e4905. [PMID: 38156036 PMCID: PMC10751243 DOI: 10.21769/bioprotoc.4905] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/31/2023] [Accepted: 11/03/2023] [Indexed: 12/30/2023] Open
Abstract
Advanced immunoassays are crucial in assessing antibody responses, serving immune surveillance goals, characterising immunological responses to evolving viral variants, and guiding subsequent vaccination initiatives. This protocol outlines an indirect ELISA protocol to detect and quantify virus-specific antibodies in plasma or serum after exposure to viral antigens. The assay enables the measurement of IgG, IgA, and IgM antibodies specific to the virus of interest, providing qualitative and quantitative optical densities and concentration data. Although this protocol refers to SARS-CoV-2, its methodology is versatile and can be modified to assess antibody responses for various viral infections and to evaluate vaccine trial outcomes. Key features • This protocol builds upon previously described methodology [1] explicitly tailored for SARS-CoV-2 and broadens its applicability to other viral infections. • The protocol outlines establishing antibody responses to SARS-CoV-2 infections by determining optical densities and concentrations from blood plasma or serum.
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Affiliation(s)
- Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jackson Sembera
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Jennifer Serwanga
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
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Sembera J, Baine C, Ankunda V, Katende JS, Oluka GK, Akoli CH, Kato L, Odoch G, Ejou P, Opio S, Musenero M, Kaleebu P, Serwanga J. Sustained spike-specific IgG antibodies following CoronaVac (Sinovac) vaccination in sub-Saharan Africa, but increased breakthrough infections in baseline spike-naive individuals. Front Immunol 2023; 14:1255676. [PMID: 38098482 PMCID: PMC10720323 DOI: 10.3389/fimmu.2023.1255676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Accepted: 11/14/2023] [Indexed: 12/17/2023] Open
Abstract
Introduction This study investigated the antibody responses to the inactivated COVID-19 vaccine, CoronaVac (Sinovac Biotech) in the African population to provide valuable insights into long-term immunity and breakthrough infections against SARS-CoV-2 in individuals with varying prior IgG seropositivity. Methods Real-life cohorts were used to longitudinally track antibody levels against the SARS-CoV-2 spike and nucleoprotein in 60 participants over 12 months to examine the levels of multiple antibody isotypes (S-IgG, S-IgM, S-IgA, N-IgG, and N-IgM). Results Throughout the 12 months, we observed consistently high and stable seropositivity rates for spike-IgG antibodies, spike-IgM antibodies showed a decline in frequencies over time, and spike-IgA levels remained moderate and stable. Vaccinated individuals previously positive for spike-IgG antibodies demonstrated strong and persistent seropositivity, while those initially negative experienced a gradual and delayed increase in seropositivity rates. The fold change analysis of S- and N- antibody responses demonstrated a consistently stable and comparable profile over time, indicating that vaccine-induced antibody responses remain constant and lack significant fluctuations beyond the initial boost. The study emphasized that individuals lacking previous IgG positivity showed reduced vaccine-induced spike-IgG antibodies and were more susceptible to breakthrough infections, highlighting their higher vulnerability. All cases of breakthrough infections were asymptomatic, indicating the conferred protection to the vaccinated individuals. Discussion The findings corroborated earlier studies on the effectiveness of the CoronaVac vaccine and emphasized the significance of accounting for pre-existing seropositivity in vaccine assessments. This study effectively demonstrated durable antibody responses against SARS-CoV-2 in the African population following the CoronaVac vaccination, providing crucial insights for informing vaccination strategies and safeguarding vulnerable populations. Continuous surveillance is imperative for tracking breakthrough infections and monitoring waning immunity. The insights gained offer crucial direction for public health strategies and enhance comprehension of vaccine effectiveness in sub-Saharan Africa. Further research should explore functional outcomes, cellular immune responses, and the vaccine's effectiveness against different variants to enhance our understanding and optimize vaccine strategies.
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Affiliation(s)
- Jackson Sembera
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Christine Hermilia Akoli
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Laban Kato
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Geoffrey Odoch
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Peter Ejou
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Solomon Opio
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Monica Musenero
- Science, Technology, and Innovation Secretariat, Office of the President, Government of Uganda, Kampala, Uganda
| | - The COVID-19 Immunoprofiling Team
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Pontiano Kaleebu
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Jennifer Serwanga
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
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9
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Ssali I, Mugaba S, Watelo AK, Bemanzi J, Katende JS, Oluka GK, Ankunda V, Baine C, Kato L, Onyachi N, Muwanga M, Jjuuko M, Kayiwa J, Nsereko C, Auma BO, Weiskopf D, Sette A, Lutalo T, Musenero M, Kaleebu P, Serwanga J. Spike protein is a key target for stronger and more persistent T-cell responses-a study of mild and asymptomatic SARS-CoV-2 infection. Int J Infect Dis 2023; 136:49-56. [PMID: 37683720 DOI: 10.1016/j.ijid.2023.09.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 08/08/2023] [Accepted: 09/02/2023] [Indexed: 09/10/2023] Open
Abstract
OBJECTIVES Understanding the immune response in very mild and asymptomatic COVID-19 is crucial for developing effective vaccines and immunotherapies, yet remains poorly characterized. This longitudinal study examined the evolution of interferon (IFN)-γ responses to SARS-CoV-2 peptides in 109 asymptomatic or mildly symptomatic Ugandan COVID-19 patients across 365 days and explored their association with antibody generation. METHODS T-cell responses to spike-containing clusters of differentiation (CD4)-S and CD8 nCoV-A (CD8-A) megapools, and the non-spike CD4-R and CD8 nCoV-B (CD8-B) megapools, were assessed and correlated with demographic and temporal variables. RESULTS SARS-CoV-2-specific IFN-γ responses were consistently detected in all peptide pools and time points, with the spike-targeted response exhibiting higher potency and durability than the non-spike responses. Throughout the entire 365-day infection timeline, a robust positive correlation was observed between CD4 T-cell responses to the spike-derived peptides and anti-spike immunoglobulin G antibody levels, underscoring their interdependent dynamics in the immune response against SARS-CoV-2; in contrast, CD8 T-cell responses exhibited no such correlation, highlighting their distinctive, autonomous role in defense. No meaningful variations in complete blood count parameters were observed between individuals with COVID-19 infection and those without, indicating clinical insignificance. CONCLUSIONS This study highlights the dominant role of spike-directed T-cell responses in mild and asymptomatic disease and provides crucial longitudinal data from Sub-Saharan African settings. The findings provide valuable insights into the dynamics of T-cell responses and their potential significance in developing effective strategies for combating COVID-19.
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Affiliation(s)
- Ivan Ssali
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Susan Mugaba
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | | | - Juliana Bemanzi
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda; Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda; Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Violet Ankunda
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Laban Kato
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Nathan Onyachi
- Department of Internal Medicine, Masaka Regional Referral Hospital, Masaka, Uganda
| | - Moses Muwanga
- Department of Internal Medicine, Entebbe Regional Referral Hospital, Entebbe, Uganda
| | - Mark Jjuuko
- Department of Internal Medicine, Masaka Regional Referral Hospital, Masaka, Uganda
| | - John Kayiwa
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Christopher Nsereko
- Department of Internal Medicine, Entebbe Regional Referral Hospital, Entebbe, Uganda
| | - Betty Oliver Auma
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Daniela Weiskopf
- Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology, La Jolla, USA
| | - Alessandro Sette
- Center for Infectious Disease and Vaccine Research, La Jolla Institute for Immunology, La Jolla, USA; Department of Medicine, Division of Infectious Diseases and Global Public Health, University of California, San Diego (UCSD), La Jolla, USA
| | - Tom Lutalo
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Monica Musenero
- Science, Technology, and Innovation Secretariat, Office of the President, Government of Uganda, Kampala, Uganda
| | - Pontiano Kaleebu
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda; Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jennifer Serwanga
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda; Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda.
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10
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Serwanga J, Baine C, Mugaba S, Ankunda V, Auma BO, Oluka GK, Kato L, Kitabye I, Sembera J, Odoch G, Ejou P, Nalumansi A, Gombe B, Musenero M, Kaleebu P. Seroprevalence and durability of antibody responses to AstraZeneca vaccination in Ugandans with prior mild or asymptomatic COVID-19: implications for vaccine policy. Front Immunol 2023; 14:1183983. [PMID: 37205095 PMCID: PMC10187141 DOI: 10.3389/fimmu.2023.1183983] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 04/06/2023] [Indexed: 05/21/2023] Open
Abstract
Introduction The duration and timing of immunity conferred by COVID-19 vaccination in sub-Saharan Africa are crucial for guiding pandemic policy interventions, but systematic data for this region is scarce. This study investigated the antibody response after AstraZeneca vaccination in COVID-19 convalescent Ugandans. Methods We recruited 86 participants with a previous rt-PCR-confirmed mild or asymptomatic COVID-19 infection and measured the prevalence and levels of spike-directed IgG, IgM, and IgA antibodies at baseline, 14 and 28 days after the first dose (priming), 14 days after the second dose (boosting), and at six- and nine-months post-priming. We also measured the prevalence and levels of nucleoprotein-directed antibodies to assess breakthrough infections. Results Within two weeks of priming, vaccination substantially increased the prevalence and concentrations of spike-directed antibodies (p < 0.0001, Wilcoxon signed rank test), with 97.0% and 66% of vaccinated individuals possessing S-IgG and S-IgA antibodies before administering the booster dose. S-IgM prevalence changed marginally after the initial vaccination and barely after the booster, consistent with an already primed immune system. However, we also observed a rise in nucleoprotein seroprevalence, indicative of breakthroughs six months after the initial vaccination. Discussion Our results suggest that vaccination of COVID-19 convalescent individuals with the AstraZeneca vaccine induces a robust and differential spike-directed antibody response. The data highlights the value of vaccination as an effective method for inducing immunity in previously infected individuals and the importance of administering two doses to maintain protective immunity. Monitoring anti-spike IgG and IgA when assessing vaccine-induced antibody responses is suggested for this population; assessing S-IgM will underestimate the response. The AstraZeneca vaccine is a valuable tool in the fight against COVID-19. Further research is needed to determine the durability of vaccine-induced immunity and the potential need for booster doses.
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Affiliation(s)
- Jennifer Serwanga
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Susan Mugaba
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Betty Oliver Auma
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Laban Kato
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Isaac Kitabye
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Jackson Sembera
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Geoffrey Odoch
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Peter Ejou
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Amina Nalumansi
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Ben Gombe
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Monica Musenero
- Science, Technology, and Innovation Secretariat, Office of the President, Government of Uganda, Kampala, Uganda
| | - Pontiano Kaleebu
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
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11
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Nantambi H, Sembera J, Ankunda V, Ssali I, Kalyebi AW, Oluka GK, Kato L, Ubaldo B, Kibengo F, Katende JS, Gombe B, Baine C, Odoch G, Mugaba S, Sande OJ, Kaleebu P, Serwanga J. Pre-pandemic SARS-CoV-2-specific IFN-γ and antibody responses were low in Ugandan samples and significantly reduced in HIV-positive specimens. Front Immunol 2023; 14:1148877. [PMID: 37153598 PMCID: PMC10154590 DOI: 10.3389/fimmu.2023.1148877] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 04/04/2023] [Indexed: 05/09/2023] Open
Abstract
Introduction We investigated whether prior SARS-CoV-2-specific IFN-γ and antibody responses in Ugandan COVID-19 pre-pandemic specimens aligned to this population's low disease severity. Methods We used nucleoprotein (N), spike (S), NTD, RBD, envelope, membrane, SD1/2-directed IFN-γ ELISpots, and an S- and N-IgG antibody ELISA to screen for SARS-CoV-2-specific cross-reactivity. Results HCoV-OC43-, HCoV-229E-, and SARS-CoV-2-specific IFN-γ occurred in 23, 15, and 17 of 104 specimens, respectively. Cross-reactive IgG was more common against the nucleoprotein (7/110, 15.5%; p = 0.0016, Fishers' Exact) than the spike (3/110, 2.72%). Specimens lacking anti-HuCoV antibodies had higher rates of pre-epidemic SARS-CoV-2-specific IFN-γ cross-reactivity (p-value = 0.00001, Fishers' exact test), suggesting that exposure to additional factors not examined here might play a role. SARS-CoV-2-specific cross-reactive antibodies were significantly less common in HIV-positive specimens (p=0.017; Fishers' Exact test). Correlations between SARS-CoV-2- and HuCoV-specific IFN-γ responses were consistently weak in both HIV negative and positive specimens. Discussion These findings support the existence of pre-epidemic SARS-CoV-2-specific cellular and humoral cross-reactivity in this population. The data do not establish that these virus-specific IFN-γ and antibody responses are entirely specific to SARS-CoV-2. Inability of the antibodies to neutralise SARS-CoV-2 implies that prior exposure did not result in immunity. Correlations between SARS-CoV-2 and HuCoV-specific responses were consistently weak, suggesting that additional variables likely contributed to the pre-epidemic cross-reactivity patterns. The data suggests that surveillance efforts based on the nucleoprotein might overestimate the exposure to SARS-CoV-2 compared to inclusion of additional targets, like the spike protein. This study, while limited in scope, suggests that HIV-positive people are less likely than HIV-negative people to produce protective antibodies against SARS-CoV-2.
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Affiliation(s)
- Hellen Nantambi
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Department of Immunology and Molecular Biology, College of Health Sciences, Makerere University, Kampala, Uganda
| | - Jackson Sembera
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Ivan Ssali
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Arthur Watelo Kalyebi
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
- Department of Immunology and Molecular Biology, College of Health Sciences, Makerere University, Kampala, Uganda
| | - Gerald Kevin Oluka
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Laban Kato
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Bahemuka Ubaldo
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Freddie Kibengo
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Joseph Ssebwana Katende
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Ben Gombe
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Geoffrey Odoch
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Susan Mugaba
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
| | - Obondo James Sande
- Department of Immunology and Molecular Biology, College of Health Sciences, Makerere University, Kampala, Uganda
| | - The COVID-19 Immunoprofiling Team
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Pontiano Kaleebu
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jennifer Serwanga
- Medical Research Council (MRC), Uganda Virus Research Institute (UVRI) and London School of Hygiene and Tropical Medicine (LSHTM), Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
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12
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Serwanga J, Ankunda V, Sembera J, Kato L, Oluka GK, Baine C, Odoch G, Kayiwa J, Auma BO, Jjuuko M, Nsereko C, Cotten M, Onyachi N, Muwanga M, Lutalo T, Fox J, Musenero M, Kaleebu P. Rapid, early, and potent Spike-directed IgG, IgM, and IgA distinguish asymptomatic from mildly symptomatic COVID-19 in Uganda, with IgG persisting for 28 months. Front Immunol 2023; 14:1152522. [PMID: 37006272 PMCID: PMC10060567 DOI: 10.3389/fimmu.2023.1152522] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 02/28/2023] [Indexed: 04/04/2023] Open
Abstract
Introduction Understanding how spike (S)-, nucleoprotein (N)-, and RBD-directed antibody responses evolved in mild and asymptomatic COVID-19 in Africa and their interactions with SARS-CoV-2 might inform development of targeted treatments and vaccines. Methods Here, we used a validated indirect in-house ELISA to characterise development and persistence of S- and N-directed IgG, IgM, and IgA antibody responses for 2430 SARS-CoV-2 rt-PCR-diagnosed Ugandan specimens from 320 mild and asymptomatic COVID-19 cases, 50 uninfected contacts, and 54 uninfected non-contacts collected weekly for one month, then monthly for 28 months. Results During acute infection, asymptomatic patients mounted a faster and more robust spike-directed IgG, IgM, and IgA response than those with mild symptoms (Wilcoxon rank test, p-values 0.046, 0.053, and 0.057); this was more pronounced in males than females. Spike IgG antibodies peaked between 25 and 37 days (86.46; IQR 29.47-242.56 BAU/ml), were significantly higher and more durable than N- and RBD IgG antibodies and lasted for 28 months. Anti-spike seroconversion rates consistently exceeded RBD and nucleoprotein rates. Spike- and RBD-directed IgG antibodies were positively correlated until 14 months (Spearman's rank correlation test, p-values 0.0001 to 0.05), although RBD diminished faster. Significant anti-spike immunity persisted without RBD. 64% and 59% of PCR-negative, non-infected non-contacts and suspects, exhibited baseline SARS-CoV-2 N-IgM serological cross-reactivity, suggesting undetected exposure or abortive infection. N-IgG levels waned after 787 days, while N-IgM levels remained undetectable throughout. Discussion Lower N-IgG seroconversion rates and the absence of N-IgM indicate that these markers substantially underestimate the prior exposure rates. Our findings provide insights into the development of S-directed antibody responses in mild and asymptomatic infections, with varying degrees of symptoms eliciting distinct immune responses, suggesting distinct pathogenic pathways. These longer-lasting data inform vaccine design, boosting strategies, and surveillance efforts in this and comparable settings.
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Affiliation(s)
- Jennifer Serwanga
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Violet Ankunda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Jackson Sembera
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Laban Kato
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Gerald Kevin Oluka
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Claire Baine
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Geoffrey Odoch
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - John Kayiwa
- Department of Virology, Uganda Virus Research Institute, Entebbe, Uganda
| | - Betty Oliver Auma
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
| | - Mark Jjuuko
- Department of Internal Medicine, Masaka Regional Referral Hospital, Masaka, Uganda
| | - Christopher Nsereko
- Department of Internal Medicine, Entebbe Regional Referral Hospital, Entebbe, Uganda
| | - Matthew Cotten
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Medical Research Council, University of Glasgow Centre for Virus Research, Glasgow, United Kingdom
| | - Nathan Onyachi
- Department of Internal Medicine, Masaka Regional Referral Hospital, Masaka, Uganda
| | - Moses Muwanga
- Department of Internal Medicine, Entebbe Regional Referral Hospital, Entebbe, Uganda
| | - Tom Lutalo
- Department of Epidemiology and Data Management, Uganda Virus Research Institute, Entebbe, Uganda
| | - Julie Fox
- Guy’s and St Thomas’ National Health Services Foundation Trust, King’s College London, London, United Kingdom
| | - Monica Musenero
- Science, Technology, and Innovation Secretariat, Office of the President, Government of Uganda, Kampala, Uganda
| | - Pontiano Kaleebu
- Pathogen Genomics, Phenotype, and Immunity Program, Medical Research Council, Uganda Virus Research Institute and London School of Hygiene and Tropical Medicine, Uganda Research Unit, Entebbe, Uganda
- Department of Immunology, Uganda Virus Research Institute, Entebbe, Uganda
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