| Active Not Recruiting | Pancoronavirus Vaccine Study in Healthy Adults NCT06950177 | Duke University | Phase 1 |
| Recruiting | Thymalfasin (Thymosin Alpha 1; Ta1) as an Enhancer of Vaccine Response Among Older Adults Receiving Booster Do NCT06821100 | The Methodist Hospital Research Institute | Phase 1 |
| Active Not Recruiting | Vaccine Hesitancy in Black/African Americans With Rheumatic Diseases NCT05822219 | Northwestern University | N/A |
| Unknown | Safety and Immunogenicity of Recombinant COVID-19 Trivalent Protein Vaccine （CHO Cell）LYB002V14 in Booster Vac NCT06167915 | Guangzhou Patronus Biotech Co., Ltd. | Phase 1 |
| Unknown | Evaluation of Safety, Tolerability, Reactogenicity, Immunogenicity of Baiya SARS-CoV-2 Vax 2 as a Booster for NCT05873374 | Baiya Phytopharm Co., Ltd. | Phase 2 |
| Completed | COVID-19 Vaccination Hesitancy in Adults With Sickle Cell Disease NCT05998824 | Duke University | N/A |
| Active Not Recruiting | SCIVAX: Biomarkers of Immune Dysfunction and Vaccine Responsiveness in Chronic SCI NCT05869968 | Northwell Health | — |
| Completed | ARVAC-A New Recombinant Coronavirus Disease 2019 (COVID-19) Vaccine NCT05752201 | Centro de Educación Medica e Investigaciones Clínicas Norberto Quirno | Phase 2 / Phase 3 |
| Unknown | Safety and Immunogenicity of the RNA MCTI CIMATEC HDT Vaccine NCT05542693 | Azidus Brasil | Phase 2 |
| Unknown | To Explore the Protective Effect of SARS-CoV-2 Vaccination on Cancer Patients Infected With SARS-CoV-2 NCT05774171 | Cancer Institute and Hospital, Chinese Academy of Medical Sciences | — |
| Completed | A Phase II/III Study of PIKA Recombinant SARS-CoV-2 Vaccine as a Booster Dose. NCT05463419 | Yisheng Biopharma (Singapore) Pte. Ltd. | Phase 2 / Phase 3 |
| Unknown | COVID-19 Vaccine and Development of Immune Thrombocytopenic Purpura NCT05455983 | Assiut University | — |
| Completed | A Study to Evaluate Immunogenicity and Safety of MVC-COV1901 Compared With AZD1222 in Adults Aged 18 Years and NCT05198596 | Medigen Vaccine Biologics Corp. | Phase 3 |
| Completed | A Study to Evaluate Immunogenicity and Safety of MVC-COV1901 Vaccine Compared With AZD1222 NCT05426343 | Medigen Vaccine Biologics Corp. | Phase 3 |
| Unknown | Efficacy and Safety of Covid-19 Vaccine in Cardiac Patients NCT05348629 | Mina sobhi said fam | — |
| Completed | A Study to Evaluate the Safety, Tolerability, and Immunogenicity of MVC-COV1901 or MVC-COV1901(Beta) Against C NCT05216601 | Medigen Vaccine Biologics Corp. | Phase 1 |
| Completed | ARVAC - A New Recombinant Coronavirus Disease 2019 (COVID-19) Vaccine NCT05656508 | Laboratorio Pablo Cassara S.R.L. | Phase 1 |
| Unknown | Evaluation of the Safety, Tolerability, and Reactogenicity of the Baiya SARS-CoV-2 Vax 2 Vaccine for COVID-19 NCT05197712 | Baiya Phytopharm Co., Ltd. | Phase 1 |
| Completed | Study to Assess the Safety, Tolerability and Explore the Immunogenicity of EG-COVID and EG-COVARo in Healthy A NCT05188469 | EyeGene Inc. | Phase 1 / Phase 2 |
| Completed | Covid-19 Vaccine Response in Heart Transplant Recipients NCT05268679 | Assistance Publique - Hôpitaux de Paris | — |
| Unknown | Combination Assessment Trial of COVID-19 Vaccines (COMBAT-COVID) NCT05162482 | Aga Khan University Hospital, Pakistan | Phase 2 |
| Completed | A Study to Evaluate the Safety and Immunogenicity of Booster With AZD1222, mRNA-1273, or MVC-COV1901 Against C NCT05197153 | Medigen Vaccine Biologics Corp. | Phase 2 |
| Unknown | SARS-CoV-2 Antibody Response in Children Aged 5-11 Years Following Vaccination Against COVID-19 NCT05175989 | Rabin Medical Center | — |
| Terminated | PROmotion of COvid-19 VA(X)Ccination in the Emergency Department - PROCOVAXED NCT05142332 | University of California, San Francisco | N/A |
| Terminated | Enabling Family Physicians to Reduce Vaccine Hesitancy and Increase Covid-19 Vaccine Uptake NCT04963790 | Hopital Montfort | N/A |
| Completed | Cardiac Manifestation in Adolescent After Pfizer COVID-19 Injection in Thailand NCT05288231 | Mahidol University | — |
| Completed | Evaluation of the Acceptance of the Anti-COVID-19 Vaccine Offer Among Pregnant Women NCT05729191 | Fondazione Policlinico Universitario Agostino Gemelli IRCCS | — |
| Unknown | Third Dose of mRNA Vaccination to Boost COVID-19 Immunity (mBoost Study) NCT05057182 | The University of Hong Kong | Phase 4 |
| Unknown | A Heterologous 3rd COVID-19 Vaccine of MVC-COV1901 to Evaluate Immunogenicity and Safety in Adults With ChAdOx NCT05097053 | Taoyuan General Hospital | Phase 4 |
| Completed | Phase IIB Study of Recombinant Novel Coronavirus Vaccine NCT05293223 | Fundación Huésped | Phase 2 |
| Completed | Third Dose Vaccination With AstraZeneca or Pfizer COVID-19 Vaccine Among Adults Received Sinovac COVID-19 Vacc NCT05049226 | Mahidol University | Phase 2 |
| Completed | Immunogenicity Induced by COVID-19 Vaccines in Mexican Population NCT06597370 | National Polytechnic Institute, Mexico | — |
| Unknown | Collaborative Study to Evaluate Heterologous Vaccination Against Covid-19 in Argentina NCT04988048 | Ministry of Public Health, Argentina | Phase 2 |
| Unknown | Safety and Immunogenicity of COVID-19 Vaccine Administered in Older Adults NCT05012800 | Beijing 302 Hospital | Phase 4 |
| Unknown | The Burden of Lyme Disease (BOLD) in a Pandemic - Insights From an Online Cross-sectional and Prospective Coho NCT05312619 | Dr. Daniel Cameron & Associates | — |
| Unknown | Modulation of Gut Microbiota to Enhance Health and Immunity NCT04884776 | Chinese University of Hong Kong | N/A |
| Completed | Iron and COVID-19 Vaccine Response NCT04915820 | Jomo Kenyatta University of Agriculture and Technology | N/A |
| Completed | ChulaCov19 Vaccine in Healthy Adults NCT04566276 | Chulalongkorn University | Phase 1 / Phase 2 |
| Completed | Assess the Safety and Immunogenicity of NDV-HXP-S Vaccine in Thailand NCT04764422 | Mahidol University | Phase 1 / Phase 2 |
| Unknown | Safety and Immunogenicity of the Inactivated Koçak-19 Inaktif Adjuvanlı COVID-19 Vaccine Compared to Placebo NCT04838080 | Kocak Farma | Phase 1 |
| Completed | A Phase 1/2 Safety and Immunogenicity Trial of COVID-19 Vaccine COVIVAC (Phase 1) NCT04830800 | Institute of Vaccines and Medical Biologicals, Vietnam | Phase 1 |
| Completed | Serological Response to mRNA and Inactivated COVID-19 Vaccine in Health Care Workers in Hong Kong NCT04898946 | Hong Kong Sanatorium & Hospital | — |
| Unknown | Effects of COVID 19 Vaccine on Egyptian Population NCT04809948 | Assiut University | — |
| Completed | Host Immune Response to Novel RNA COVID-19 Vaccination NCT04784689 | The University of Texas Health Science Center at San Antonio | — |
| Unknown | Oxidative Stress Parameters, Trace Element and Quality of Life in Women Before and After Covid-19 Vaccines NCT04751721 | Izmir Bakircay University | N/A |
| Unknown | Oxidative Stress Parameters, Trace Element and Quality of Life in Men Before and After Covid-19 Vaccines NCT04751695 | Izmir Bakircay University | N/A |
| Unknown | Quantification of Binding and Neutralizing Antibody Levels in COVID-19 Vaccinated Health Care Workers Over 1 Y NCT04910971 | LifeBridge Health | — |
| Completed | Is COVID-19 Transmitted Through Human Milk? Implications for Breastfeeding and Human Milk Banking-Study 1c NCT05004740 | Deborah O'Connor | — |
| Completed | Safety and Immunogenicity Trial of Multi-peptide Vaccination to Prevent COVID-19 Infection in Adults NCT04546841 | University Hospital Tuebingen | Phase 1 |
| Completed | Safety and Immunogenicity of Two Different Strengths of the Inactivated COVID-19 Vaccine ERUCOV-VAC NCT04691947 | Health Institutes of Turkey | Phase 1 |
| Unknown | Use of BCG Vaccine as a Preventive Measure for COVID-19 in Health Care Workers NCT04659941 | Universidade Federal do Rio de Janeiro | Phase 2 |
| Recruiting | Researchers At UC San Diego Are Learning About the Benefits of Human Milk and How It Influences Infant and Chi NCT05553743 | University of California, San Diego | — |