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Springer DN, Daller S, Knappik M, Prüger K, Hartl S, Breyer-Kohansal R, Puchhammer-Stöckl E, Aberle JH, Weseslindtner L, Breyer MK. A Multivariant Surrogate Virus Neutralization Test Demonstrates Distinct SARS-CoV-2-Specific Antibody Responses in People Living with HIV after a Fourth Monovalent mRNA Vaccination or an Omicron Breakthrough Infection. Diagnostics (Basel) 2024; 14:822. [PMID: 38667468 PMCID: PMC11049121 DOI: 10.3390/diagnostics14080822] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Revised: 03/30/2024] [Accepted: 04/11/2024] [Indexed: 04/28/2024] Open
Abstract
While neutralizing antibodies (nAbs) induced by monovalent severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccinations are primarily directed against the wildtype (WT), subsequent exposure to the Omicron variants may increase the breadth of the antibodies' cross-neutralizing activity. Here, we analyzed the impact of an Omicron breakthrough infection (BTI) or a fourth monovalent mRNA vaccination on nAb profiles in people living with human immunodeficiency virus (PLWH). Using a multivariant surrogate virus neutralization test (sVNT), we quantified nAbs in 36 three-times vaccinated PLWH, of whom 9 acquired a serologically confirmed Omicron BTI, 8 received a fourth vaccine dose, and 19 were neither infected nor additionally vaccinated. While nAbs against WT and Delta increased after the BTI and a fourth vaccination, a significant increase against BA.1, BA.2, and BA.5 was only observed after the BTI. However, there was no significant difference in nAb concentrations between the samples obtained after the BTI and fourth vaccination. In contrast, nAb levels were significantly lower in PLWH, who were neither infected nor additionally vaccinated after three vaccinations. Thus, our study demonstrates the suitability of a multivariant sVNT to assess hybrid humoral immunity after Omicron BTIs in PLWH vaccinated against SARS-CoV-2.
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Affiliation(s)
- David Niklas Springer
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria; (D.N.S.); (K.P.); (E.P.-S.); (J.H.A.)
| | - Simon Daller
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, 1140 Vienna, Austria; (S.D.); (M.K.); (S.H.); (R.B.-K.); (M.K.B.)
| | - Michael Knappik
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, 1140 Vienna, Austria; (S.D.); (M.K.); (S.H.); (R.B.-K.); (M.K.B.)
| | - Katja Prüger
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria; (D.N.S.); (K.P.); (E.P.-S.); (J.H.A.)
| | - Sylvia Hartl
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, 1140 Vienna, Austria; (S.D.); (M.K.); (S.H.); (R.B.-K.); (M.K.B.)
- Ludwig Boltzmann Institute for Lung Health, 1140 Vienna, Austria
- Faculty of Medicine, Sigmund Freud University, 1020 Vienna, Austria
| | - Robab Breyer-Kohansal
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, 1140 Vienna, Austria; (S.D.); (M.K.); (S.H.); (R.B.-K.); (M.K.B.)
- Ludwig Boltzmann Institute for Lung Health, 1140 Vienna, Austria
| | - Elisabeth Puchhammer-Stöckl
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria; (D.N.S.); (K.P.); (E.P.-S.); (J.H.A.)
| | - Judith Helene Aberle
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria; (D.N.S.); (K.P.); (E.P.-S.); (J.H.A.)
| | - Lukas Weseslindtner
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria; (D.N.S.); (K.P.); (E.P.-S.); (J.H.A.)
| | - Marie Kathrin Breyer
- Department of Respiratory and Pulmonary Diseases, Vienna Healthcare Group, Clinic Penzing, 1140 Vienna, Austria; (S.D.); (M.K.); (S.H.); (R.B.-K.); (M.K.B.)
- Ludwig Boltzmann Institute for Lung Health, 1140 Vienna, Austria
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Lavell AHA, Schramade AE, Sikkens JJ, van der Straten K, van Dort KA, Slim MA, Appelman B, van Vught LA, Vlaar APJ, Kootstra NA, van Gils MJ, Smulders YM, de Jongh RT, Bomers MK. 25-Hydroxyvitamin D concentrations do not affect the humoral or cellular immune response following SARS-CoV-2 mRNA vaccinations. Vaccine 2024; 42:1478-1486. [PMID: 37775466 DOI: 10.1016/j.vaccine.2023.08.025] [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] [Received: 03/10/2023] [Revised: 08/04/2023] [Accepted: 08/10/2023] [Indexed: 10/01/2023]
Abstract
BACKGROUND To improve effectiveness of vaccination against SARS-CoV-2, it is important to identify factors that influence the immune response induced by vaccination. Evidence for the role of vitamin D in immune response against SARS-CoV-2 is contradictory. It is therefore of interest whether 25-hydroxyvitamin D (25[OH]D) concentrations affect the humoral and/or cellular response following SARS-CoV-2 vaccination. METHODS In this prospective cohort study, blood samples were collected from 98 SARS-CoV-2 naive health care workers (HCW) receiving the first two doses of either BNT162b2 or mRNA-1273 in 2021. Wild-type spike (S) protein binding and neutralizing antibodies were determined approximately three weeks after the first dose and four to five weeks after the second dose. Antigen specific T-cells and functionality (proliferative response and interferon gamma [IFN-γ] release) were determined in 18 participants four weeks after the second dose of BNT162b2. We studied the association between 25(OH)D concentrations, which were determined prior to vaccination, and humoral and cellular immune responses following vaccination. RESULTS We found no association between 25(OH)D concentrations (median 55.9 nmol/L [IQR 40.5-69.8]) and binding or neutralizing antibody titers after complete vaccination (fold change of antibody titers per 10 nmol/L 25(OH)D increase: 0.98 [95% CI 0.93-1.04] and 1.03 [95% CI: 0.96-1.11], respectively), adjusted for age, sex and type of mRNA vaccine. Subsequently, continuous 25(OH)D concentrations were divided into commonly used clinical categories (<25 nmol/L [n = 6, 6%], 25-49 nmol/L [n = 33, 34%], 50-75 nmol/L [n = 37, 38%] and ≥75 nmol/L [n = 22, 22%]), but no association with the humoral immune response following vaccination was found. Also, 25(OH)D concentrations were not associated with the SARS-CoV-2 specific T cell response. CONCLUSION No association was found between 25(OH)D concentrations and the humoral or cellular immune response following mRNA vaccination against SARS-CoV-2. Based on our findings there is no rationale to advise vitamin D optimization preceding SARS-CoV-2 vaccination in HCW with moderate vitamin D status.
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Affiliation(s)
- A H A Lavell
- Amsterdam UMC Location Vrije Universiteit Amsterdam, Department of Internal Medicine, Department of Infectious Diseases and Department of Endocrinology and Metabolism, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands; Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands
| | - A E Schramade
- Amsterdam UMC Location Vrije Universiteit Amsterdam, Department of Internal Medicine, Department of Infectious Diseases and Department of Endocrinology and Metabolism, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands; Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands
| | - J J Sikkens
- Amsterdam UMC Location Vrije Universiteit Amsterdam, Department of Internal Medicine, Department of Infectious Diseases and Department of Endocrinology and Metabolism, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands; Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands
| | - K van der Straten
- Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Medical Microbiology and Infection Prevention, Laboratory of Experimental Virology, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Internal Medicine, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands
| | - K A van Dort
- Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Experimental Immunology, 1105 AZ, the Netherlands
| | - M A Slim
- Amsterdam UMC Location University of Amsterdam, Center for Experimental and Molecular Medicine, Meibergdreef 9, Amsterdam 1105 AZ, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Intensive Care, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands
| | - B Appelman
- Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Center for Experimental and Molecular Medicine, Meibergdreef 9, Amsterdam 1105 AZ, the Netherlands
| | - L A van Vught
- Amsterdam UMC Location University of Amsterdam, Center for Experimental and Molecular Medicine, Meibergdreef 9, Amsterdam 1105 AZ, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Intensive Care, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands
| | - A P J Vlaar
- Amsterdam UMC Location University of Amsterdam, Department of Intensive Care, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Laboratory of Experimental Intensive Care and Anesthesiology (L.E.I.C.A.), Meibergdreef 9, Amsterdam 1105 AZ, the Netherlands
| | - N A Kootstra
- Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Experimental Immunology, 1105 AZ, the Netherlands
| | - M J van Gils
- Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands; Amsterdam UMC Location University of Amsterdam, Department of Medical Microbiology and Infection Prevention, Laboratory of Experimental Virology, Meibergdreef 9, 1105 AZ Amsterdam, the Netherlands
| | - Y M Smulders
- Amsterdam UMC Location Vrije Universiteit Amsterdam, Department of Internal Medicine, Department of Infectious Diseases and Department of Endocrinology and Metabolism, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands; Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands
| | - R T de Jongh
- Amsterdam UMC Location Vrije Universiteit Amsterdam, Department of Internal Medicine, Department of Infectious Diseases and Department of Endocrinology and Metabolism, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands; Amsterdam Gastroenterology Endocrinology Metabolism Research Institute, Amsterdam, the Netherlands
| | - M K Bomers
- Amsterdam UMC Location Vrije Universiteit Amsterdam, Department of Internal Medicine, Department of Infectious Diseases and Department of Endocrinology and Metabolism, De Boelelaan 1117, 1081 HV Amsterdam, the Netherlands; Amsterdam Institute for Infection & Immunity, Amsterdam, the Netherlands.
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Chammartin F, Griessbach A, Kusejko K, Audigé A, Epp S, Stoeckle MP, Eichenberger AL, Amstutz A, Schoenenberger CM, Hasse B, Braun DL, Rauch A, Trkola A, Briel M, Bucher HC, Günthard HF, Speich B, Abela IA. Bridging the gap: identifying factors impacting mRNA severe acute respiratory syndrome coronavirus 2 vaccine booster response in people with HIV-1. AIDS 2024; 38:217-222. [PMID: 37830908 DOI: 10.1097/qad.0000000000003751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2023]
Abstract
OBJECTIVES This study aimed to investigate the association of demographic and clinical characteristics, including HIV-specific parameters with the antibody response to a third dose of a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) mRNA vaccine in people with HIV-1 (PWH). DESIGN Post hoc analysis of data collected during the observational extension of the COrona VaccinE tRiAL pLatform trial (COVERALL-2) nested into the Swiss HIV Cohort Study (SHCS). METHODS Serological measurements were conducted on a total of 439 PWH who had received a third dose of either mRNA-1273 (Moderna) or BNT162b2 (Pfizer-BioNTech) SARS-CoV-2 vaccine. Antibody reactivity was assessed using the multifactorial ABCORA immunoassay that defines SARS-CoV-2 seroconversion and predicts neutralization activity. The association between log transformed antibody reactivity and various baseline factors, including vaccine type, demographics, immune and viral status, smoking status, comorbidities, infection history, and co-medication with chemotherapy and immunosuppressive drugs, was investigated using a multivariable linear regression model. RESULTS Antibody response to third SARS-CoV-2 vaccination was significantly lower among PWH with CD4 + cell count less than 350 cells/μl [ratio of means 0.79; 95% confidence interval (CI) 0.65-0.95]. Having a detectable HIV-1 viral load at least 50 copies/ml and being on concurrent chemotherapy was associated with an overall lower humoral immune response (ratio of means 0.75; 95% CI 0.57-1.00 and 0.34; 95% CI 0.22-0.52, respectively). CONCLUSION The study highlights the importance of optimal antiretroviral treatment for PWH, emphasizing the need for timely intervention to enhance the vaccine immunogenicity in this population. Moreover, it underscores the significance of sequential mRNA vaccination and provides important evidence for informing vaccine guidelines.
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Affiliation(s)
- Frédérique Chammartin
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Alexandra Griessbach
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Katharina Kusejko
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Annette Audigé
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Selina Epp
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Marcel P Stoeckle
- Division of Infectious Diseases and Hospital Epidemiology, University Hospital Basel, University of Basel, Basel, Switzerland
| | - Anna L Eichenberger
- Department of Infectious Diseases, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Alain Amstutz
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Christof M Schoenenberger
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Barbara Hasse
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
| | - Dominique L Braun
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Andri Rauch
- Department of Infectious Diseases, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Alexandra Trkola
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Matthias Briel
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Heiner C Bucher
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Huldrych F Günthard
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
| | - Benjamin Speich
- Division of Clinical Epidemiology, Department of Clinical Research, University Hospital of Basel and University of Basel, Basel, Switzerland
| | - Irene A Abela
- Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, Zurich, Switzerland
- Institute of Medical Virology, University of Zurich, Zurich, Switzerland
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4
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Costiniuk CT, Singer J, Lee T, Galipeau Y, McCluskie PS, Arnold C, Langlois MA, Needham J, Jenabian MA, Burchell AN, Samji H, Chambers C, Walmsley S, Ostrowski M, Kovacs C, Tan DH, Harris M, Hull M, Brumme ZL, Lapointe HR, Brockman MA, Margolese S, Mandarino E, Samarani S, Vulesevic B, Lebouché B, Angel JB, Routy JP, Cooper CL, Anis AH. Antibody neutralization capacity after coronavirus disease 2019 vaccination in people with HIV in Canada. AIDS 2023; 37:F25-F35. [PMID: 37534695 PMCID: PMC10481923 DOI: 10.1097/qad.0000000000003680] [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] [Received: 07/07/2023] [Accepted: 07/15/2023] [Indexed: 08/04/2023]
Abstract
OBJECTIVES Many vaccines require higher/additional doses or adjuvants to provide adequate protection for people with HIV (PWH). Here, we compare coronavirus disease 2019 (COVID-19) vaccine-induced antibody neutralization capacity in PWH vs. HIV-negative individuals following two vaccine doses. DESIGN In Canadian prospective observational cohorts, including a multicentre study of PWH receiving at least two COVID-19 vaccinations (mRNA or ChAdOx1-S), and a parallel study of HIV-negative controls (Stop the Spread Ottawa Cohort), we measured vaccine-induced neutralization capacity 3 months post dose 2 (±1 month). METHODS COVID-19 neutralization efficiency was measured by calculating the half maximal inhibitory dilution (ID50) using a high-throughput protein-based neutralization assay for Ancestral (Wuhan), Delta and Omicron (BA.1) spike variants. Univariable and multivariable quantile regression were used to compare COVID-19-specific antibody neutralization capacity by HIV status. RESULTS Neutralization assays were performed on 256 PWH and 256 controls based on specimen availability at the timepoint of interest, having received two vaccines and known date of vaccination. There was a significant interaction between HIV status and previous COVID-19 infection status in median ID50. There were no differences in median ID50 for HIV+ vs. HIV-negative persons without past COVID-19 infection. For participants with past COVID-19 infection, median ICD50 was significantly higher in controls than in PWH for ancestral SARS-CoV-2 and Omicron variants, with a trend for the Delta variant in the same direction. CONCLUSION Vaccine-induced SARS-CoV-2 neutralization capacity was similar between PWH vs. HIV-negative persons without past COVID-19 infection, demonstrating favourable humoral-mediated immunogenicity. Both HIV+ and HIV-negative persons demonstrated hybrid immunity. TRIAL REGISTRATION clinicaltrials.gov NCT04894448.
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Affiliation(s)
- Cecilia T. Costiniuk
- Division of Infectious Diseases/Chronic Viral Illness Service, McGill University Health Centre, Royal Victoria Hospital
- Infectious Diseases and Immunity in Global Health Research Program, Research Institute of McGill University Health Centre
- Department of Experimental Medicine, McGill University, Montreal, Québec
| | - Joel Singer
- School of Population and Public Health, University of British Columbia
- CIHR Canadian HIV Trials Network (CTN)
- Centre for Health Evaluation and Outcome Sciences, St. Paul's Hospital, Vancouver, British Columbia
| | - Terry Lee
- CIHR Canadian HIV Trials Network (CTN)
- Centre for Health Evaluation and Outcome Sciences, St. Paul's Hospital, Vancouver, British Columbia
| | - Yannick Galipeau
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario
| | - Pauline S. McCluskie
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario
| | - Corey Arnold
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario
| | - Marc-André Langlois
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario
| | - Judy Needham
- CIHR Canadian HIV Trials Network (CTN)
- Centre for Health Evaluation and Outcome Sciences, St. Paul's Hospital, Vancouver, British Columbia
| | - Mohammad-Ali Jenabian
- Department of Biological Sciences, Université du Québec à Montréal, Montreal, Québec
| | - Ann N. Burchell
- Department of Family and Community Medicine, St Michael's Hospital, Unity Health Toronto
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario
| | - Hasina Samji
- Faculty of Health Sciences, Simon Fraser University, Burnaby
- British Columbia Centre for Disease Control, Vancouver, British Columbia
| | - Catharine Chambers
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario
- MAP Centre for Urban Health Solutions, St Michael's Hospital
| | - Sharon Walmsley
- Division of Infectious Diseases, Department of Medicine, University of Toronto
| | - Mario Ostrowski
- Clinical Sciences Division and Department of Immunology, University of Toronto, Li Ka Shing Knowledge Institute, St. Michael's Hospital
| | | | - Darrell H.S. Tan
- MAP Centre for Urban Health Solutions, St Michael's Hospital
- Division of Infectious Diseases, Department of Medicine, University of Toronto
- Institute of Public Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario
| | - Marianne Harris
- British Columbia Centre for Excellence in HIV/AIDS, Vancouver
| | - Mark Hull
- British Columbia Centre for Excellence in HIV/AIDS, Vancouver
| | - Zabrina L. Brumme
- Faculty of Health Sciences, Simon Fraser University, Burnaby
- British Columbia Centre for Excellence in HIV/AIDS, Vancouver
| | | | - Mark A. Brockman
- Faculty of Health Sciences, Simon Fraser University, Burnaby
- British Columbia Centre for Excellence in HIV/AIDS, Vancouver
- Department of Molecular Biology and Biochemistry, Faculty of Science, Simon Fraser University, Burnaby, British Columbia
| | | | | | - Suzanne Samarani
- Division of Infectious Diseases/Chronic Viral Illness Service, McGill University Health Centre, Royal Victoria Hospital
| | - Branka Vulesevic
- CIHR Canadian HIV Trials Network (CTN)
- Division of Infectious Diseases, Department of Medicine, University of Ottawa and the Ottawa Hospital Research Institute, Ottawa, Ontario
| | - Bertrand Lebouché
- Division of Infectious Diseases/Chronic Viral Illness Service, McGill University Health Centre, Royal Victoria Hospital
- Infectious Diseases and Immunity in Global Health Research Program, Research Institute of McGill University Health Centre
- Department of Family Medicine, Faculty of Medicine and Health Sciences, McGill University
- Canadian Institutes of Health Research Strategy for Patient-Oriented Research Mentorship Chair in Innovative Clinical Trials
| | - Jonathan B. Angel
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario
- Division of Infectious Diseases, Department of Medicine, University of Ottawa and the Ottawa Hospital Research Institute, Ottawa, Ontario
| | - Jean-Pierre Routy
- Division of Infectious Diseases/Chronic Viral Illness Service, McGill University Health Centre, Royal Victoria Hospital
- Infectious Diseases and Immunity in Global Health Research Program, Research Institute of McGill University Health Centre
- Division of Hematology, Department of Medicine, McGill University Health Centre, Montreal, Québec, Canada
| | - Curtis L. Cooper
- Division of Infectious Diseases, Department of Medicine, University of Ottawa and the Ottawa Hospital Research Institute, Ottawa, Ontario
| | - Aslam H. Anis
- School of Population and Public Health, University of British Columbia
- CIHR Canadian HIV Trials Network (CTN)
- Centre for Health Evaluation and Outcome Sciences, St. Paul's Hospital, Vancouver, British Columbia
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