| Withdrawn | Direct Topical Lung T3 Treatment to Improve Outcome & Sequelae of COVID-19 Acute Respiratory Distress Syndrome NCT04725110 | University of Minnesota | Phase 2 |
| Recruiting | Mitoquinone/Mitoquinol Mesylate as Oral and Safe Postexposure Prophylaxis for Covid-19 NCT05886816 | University of Texas Southwestern Medical Center | Phase 2 |
| Unknown | Should Palatine Tonsils be Included in the Oropharyngeal Swab for SARS-CoV-2 Molecular Testing? NCT05611203 | Rigshospitalet, Denmark | N/A |
| Terminated | COVID-FIS: Pilot in COVID-19 (SARS-CoV-2) of Fisetin in Older Adults in Nursing Homes NCT04537299 | Mayo Clinic | Phase 2 |
| Withdrawn | '4C' Intervention to Reduce SARS-CoV-2 (Covid-19) Transmission NCT04739449 | University of Michigan | N/A |
| Active Not Recruiting | SARS-Cov-2 (COVID-19) Nasal Pharyngeal and Oral Pharyngeal Wash (SNOW) Trial NCT04802408 | Milton S. Hershey Medical Center | Phase 2 / Phase 3 |
| Completed | Prevention of COVID-19 Complications in High-risk Subjects Infected by SARS-CoV-2 and Eligible for Treatment U NCT04885452 | ANRS, Emerging Infectious Diseases | — |
| Completed | Evaluation of the Safety and Immunogenicity of Influenza and COVID-19 Combination Vaccine NCT04961541 | Novavax | Phase 1 / Phase 2 |
| Suspended | Baromètre Santé Adulte 2021-2022 NCT05218304 | Agence Sanitaire et Sociale de Nouvelle Calédonie | N/A |
| Completed | Rapid Detection of COVID-19 by Portable and Connected Biosensor : Biological Proof of Concept NCT04780334 | University Hospital, Lille | — |
| Withdrawn | Efficacy and Safety of Ozonised Oil (HOO) in COVID-19 Patients NCT04651387 | Neuromed IRCCS | N/A |
| Unknown | Characterization Immunology, Biochemical and Lung Microbiome, Correlated With the Ventilation Associated Pneum NCT04944823 | Universidad de la Sabana | — |
| Completed | Reactogenicity, Safety and Immunogenicity of QazCoVac-P COVID-19 Vaccine NCT04930003 | Research Institute for Biological Safety Problems | Phase 1 / Phase 2 |
| Terminated | The DAWN Antivirals Trial for Ambulatory COVID-19 Patients NCT04730206 | KU Leuven | Phase 3 |
| Unknown | Clinical Study Designed to Evaluate the Effect of CimetrA in Patients Diagnosed With COVID-19 NCT04802382 | MGC Pharmaceuticals d.o.o | Phase 3 |
| Completed | VERU-111 in the Treatment of SARS-Cov-2 Infection by Assessing Its Effect on the Proportion of Patients Who Di NCT04842747 | Veru Inc. | Phase 3 |
| Completed | GLS-1027 for the Prevention of Severe Pneumonitis Caused by SARS-CoV-2 Infection (COVID-19) NCT04590547 | GeneOne Life Science, Inc. | Phase 2 |
| Unknown | Olfactory Training for Olfactory Dysfunction After Coronavirus Disease - 19 (COVID-19) NCT04764981 | Universidade do Estado do Pará | N/A |
| Unknown | Policy Responses Against the COVID-19 Pandemic in Latin America NCT04816318 | University of Chile | — |
| Completed | Sargramostim Use in COVID-19 to Recover Patient Health NCT04707664 | Partner Therapeutics, Inc. | Phase 2 |
| Completed | RECOVAC - Long Term Efficacy and Safety of COVID-19 (SARS-CoV-2) Vaccination in Kidney Disease Patients NCT04841785 | University Medical Center Groningen | — |
| Completed | SARS-CoV-2 (COVID-19) Antibody PrevalencE in an Adult London HIV Cohort NCT05067400 | Royal Free Hospital NHS Foundation Trust | — |
| Recruiting | Imaging Immune Activation in COVID-19 NCT04815096 | CellSight Technologies, Inc. | Phase 2 |
| Completed | Diode Laser 940 nm in Management of Loss of Taste Sensation NCT04821999 | Fayoum University | N/A |
| Completed | COVID19 SARS Vaccinations: Systemic Allergic Reactions to SARS-CoV-2 Vaccinations NCT04761822 | National Institute of Allergy and Infectious Diseases (NIAID) | Phase 2 |
| Completed | Longitudinal Follow-up of Patients With Chronic Inflammatory Rheumatisms (CIRs) Vaccinated Against COVID-19 Co NCT04832022 | University Hospital, Montpellier | — |
| Unknown | Collection of the Thrombo-VaxCov Cohort NCT04889326 | University Hospital, Lille | — |
| Completed | Oral Manifestation in Patients With SARS-CoV2 Infection. NCT04821986 | Fayoum University | — |
| Completed | Infection Control for Severe Acute Respiratory Syndrome Coronavirus 2 NCT04665960 | NMC Specialty Hospital | — |
| Unknown | MIcrovascular Dysfunction in CRitically Ill cOVID-19 Patients NCT04819802 | Assistance Publique - Hôpitaux de Paris | — |
| Active Not Recruiting | SARS-COV-2 Seroprevalence and Seroconversion Among Employees of the Universitair Ziekenhuis Brussel Following NCT04880174 | Universitair Ziekenhuis Brussel | N/A |
| Unknown | Evaluate the Impact, Safety, Tolerability and Immunogenicity of the Coronavac Vaccine in Kidney Transplant Rec NCT04801667 | Hospital do Rim e Hipertensão | Phase 4 |
| Completed | Systematic Offer of Nurse-Driven Screening for COVID-19 in Emergency Departments in the Paris Metropolitan Are NCT04756609 | Assistance Publique - Hôpitaux de Paris | N/A |
| Completed | SARS-CoV-2 Human Challenge Characterisation Study NCT04865237 | Imperial College London | N/A |
| Completed | Initial CT Findings and CO-RADS Stage in COVID-19 NCT04789447 | Sultan Abdulhamid Han Training and Research Hospital, Istanbul, Turkey | — |
| Completed | Effectiveness of a Novel Respirator With Chitosan Nanoparticles NCT04490200 | University of Brasilia | N/A |
| Completed | Safety and Immunogenicity of an Intranasal SARS-CoV-2 Vaccine (BBV154) for COVID-19 NCT04751682 | Bharat Biotech International Limited | Phase 1 |
| Recruiting | KIDney Injury in Times of COVID-19 (KIDCOV) NCT04705766 | University of California, San Francisco | — |
| Completed | Comparison of Strategies Based on RT-PCR or Antigenic Test for the Screening of SARS-CoV-2 Infection (COVID-19 NCT04859023 | Centre Hospitalier Universitaire de Saint Etienne | N/A |
| Completed | Antibody Detection of Vaccine-Induced Secretory Effects NCT04895475 | Children's Hospital Medical Center, Cincinnati | — |
| Unknown | Study of HEarT DiseAse and ImmuNiTy After COVID-19 in Ireland NCT04823182 | Cardiovascular Research Institute Dublin | — |
| Withdrawn | Use of Hypochlorous Acid as Prophylaxis in Health Personnel at High Risk of Infection by SARS-CoV 2 (COVID19) NCT04684550 | Hospital Universitario San Ignacio | Phase 2 / Phase 3 |
| Unknown | COVID-19 Contact Study by Antigen Detection Test NCT04745533 | Juan Fernando Masa Jiménez | — |
| Completed | National Cohort Study of Effectiveness and Safety of SARS-CoV-2/COVID-19 Vaccines (ENFORCE) NCT04760132 | Jens D Lundgren, MD | Phase 4 |
| Unknown | COVID-19 Vaccine Response in Chronic Respiratory Conditions NCT05313087 | National Jewish Health | — |
| Terminated | Camostat With Bicalutamide for COVID-19 NCT04652765 | Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins | Phase 1 |
| Completed | Self-Collected Saliva Samples Without Viral Transport Media for COVID-19 Testing Via RT-PCR NCT04604145 | David Grant U.S. Air Force Medical Center | N/A |
| Suspended | Microbiome Therapy in Covid-19 Primary Care Support NCT04793997 | University Hospital, Antwerp | N/A |
| Unknown | Analysing the French COVID-19 Epidemic Using a National SARS-CoV-2 RT-PCR Database NCT04738331 | University Hospital, Montpellier | — |
| Unknown | Infection Tracking in Travellers. The Project Aims to Identify Profiles of Travel-associated Illness and to Fo NCT04672577 | Patricia Schlagenhauf | — |
| Unknown | SARS-CoV-2 (COVID-19) Longitudinal Study: Understanding Susceptibility, Transmission and Disease Severity (Leg NCT04750356 | University College, London | — |
| Unknown | COVID-19 Induced Telogen Effluvium NCT04834102 | Istanbul Medeniyet University | — |
| Active Not Recruiting | Severe Acute Respiratory Syndrome Corona Virus 2 (SARS-CoV-2) Immune Kidney Transplant Study (COVID-19) NCT04747522 | Oslo University Hospital | — |
| Completed | COVID-19: SARS-CoV-2 Detection in Saliva, Oropharyngeal and Nasopharyngeal Specimens NCT04715607 | Rigshospitalet, Denmark | N/A |
| Terminated | CorONa Virus edoxabaN ColchicinE (CONVINCE) COVID-19 NCT04516941 | Insel Gruppe AG, University Hospital Bern | Phase 3 |
| Terminated | A Trial Evaluating the Safety and Effects of an RNA Vaccine ARCT-021 in Healthy Adults NCT04668339 | Arcturus Therapeutics, Inc. | Phase 2 |
| Withdrawn | Nitric Oxide Releasing Solution to Treat and Prevent Exacerbation of Mild COVID-19 Infection NCT04443868 | Sanotize Research and Development corp. | Phase 2 |
| Completed | COVID-OUT: Early Outpatient Treatment for SARS-CoV-2 Infection (COVID-19) NCT04510194 | University of Minnesota | Phase 3 |
| Unknown | COVID-19 Infection and Fetal-neonatal Outcomes NCT04699578 | University of Campania Luigi Vanvitelli | — |
| Completed | A Study to Evaluate the Efficacy, Immune Response, and Safety of a COVID-19 Vaccine in Adults ≥ 18 Years With NCT04611802 | Novavax | Phase 3 |
| Completed | Immunogenicity, Efficacy and Safety of QazCovid-in® COVID-19 Vaccine NCT04691908 | Research Institute for Biological Safety Problems | Phase 3 |
| Completed | Umbilical Cord Lining Stem Cells (ULSC) in Patients With COVID-19 ARDS NCT04494386 | Restem, LLC. | Phase 1 / Phase 2 |
| Terminated | Efficacy of the Sit to Stand Test in the Decision to Hospitalize a Patient Consulting the Emergency Dept for C NCT04730661 | University Hospital, Rouen | N/A |
| Completed | Glenzocimab in SARS-Cov-2 Acute Respiratory DistrEss syNdrome Related to COVID-19 NCT04659109 | Acticor Biotech | Phase 2 |
| Completed | High Dose Vitamin-D Substitution in Patients With COVID-19: a Randomized Controlled, Multi Center Study NCT04525820 | Prof. Dr. Jörg Leuppi | N/A |
| Completed | Trial of Combination Therapy to Treat COVID-19 Infection NCT04482686 | ProgenaBiome | Phase 1 |
| Completed | Study of Oral Administration of Ribavirin and Nitazoxamide Versus Placebo in COVID-19 NCT04563208 | University of Witwatersrand, South Africa | Phase 2 |
| Completed | COVID-19 Prophylaxis South Africa (COVER HCW) NCT04561063 | University of Witwatersrand, South Africa | Phase 2 |
| Completed | Sero-prevalence COVID-19 Among Belgian Children NCT04613817 | Sciensano | — |
| Terminated | A Triple Combination Antiviral Coronavirus Therapy (TriACT) for COVID-19 NCT04605588 | Rutgers, The State University of New Jersey | Phase 2 |
| Completed | Seroprevalence Study of CoV-2-SARS (COVID-19) Infection in Patients With Chronic Inflammatory Rheumatic Diseas NCT04655612 | University Hospital, Montpellier | — |
| Completed | COVID-19 in Polish Ice Swimmers. NCT04817280 | Wroclaw Medical University | — |
| Completed | The Containing Coronavirus Disease 19 (COVID-19) Trial NCT04552379 | Pontificia Universidad Catolica de Chile | Phase 3 |
| Unknown | A Phase III Clinical Trial of the Immunogenicity and Safety of the Gam-COVID-Vac Vaccine Against COVID-19 in t NCT04656613 | Gamaleya Research Institute of Epidemiology and Microbiology, Health Ministry of the Russian Federation | Phase 3 |
| Completed | Short and Medium-term Effects of Pulmonary Rehabilitation in Mild to Critical Post-acute COVID-19 NCT04649918 | Schön Klinik Berchtesgadener Land | — |
| Completed | Inhaled NO for the Treatment of Viral Pneumonia in Adults NCT04606407 | Beyond Air Inc. | N/A |
| Unknown | Steroids and Unfractionated Heparin in Critically Ill Patients With Pneumonia From COVID-19 Infection NCT04528888 | Massimo Girardis | Phase 3 |
| Unknown | An Efficacy and Safety Clinical Trial of an Investigational COVID-19 Vaccine (BBV152) in Adult Volunteers NCT04641481 | Bharat Biotech International Limited | Phase 3 |
| Completed | Muscle Weakness in COVID-19 Patients NCT04959773 | University of Pavia | — |
| Completed | MOIST Study: Multi-Organ Imaging With Serial Testing in COVID-19 Infected Patients NCT04525404 | University of Alberta | — |
| Completed | A Virtual Prospective Study Exploring Activity Trackers and COVID-19 Infections NCT04623138 | Evidation Health | — |
| Withdrawn | Proxalutamide Treatment for COVID-19 Female Outpatients NCT04853134 | Applied Biology, Inc. | Phase 3 |
| Unknown | IVIG in Patients With Severe COVID-19 Requiring Mechanical Ventilation NCT04616001 | Sharp HealthCare | Phase 4 |
| Unknown | A Phase 3 Randomized Double Blind Efficacy and Safety Study of Oral Polio Vaccine and NA-831 for Covid-19 NCT04540185 | Biomed Industries, Inc. | Phase 3 |
| Unknown | Serological Diagnostics of COVID-19 in Health Care Workers NCT04635592 | University Medical Centre Ljubljana | — |
| Completed | Prognosis and Course of COVID-19 Infection in Hospitalised Patients NCT04752085 | I.M. Sechenov First Moscow State Medical University | — |
| Unknown | Chemoprevention Clinical Trial of COVID-19: Hydroxychloroquine Post Exposure Prophylaxis NCT04597775 | Regional Center for Disease Control and Prevention, Jordan | Phase 2 / Phase 3 |
| Completed | A Feasibility Study Using the CoronaCheck Device to Identify Incident Cases of SARS CoV-2 Covid-19 NCT04742712 | Portsmouth Hospitals NHS Trust | — |
| Completed | Electrical Impedance Tomography: Collapse in Dependent Areas as a Predictor of Response to Prone Position Vent NCT04603755 | Direction Centrale du Service de Santé des Armées | — |
| Completed | Efficacy and Safety of Favipiravir in Covid-19 Patients in Indonesia NCT04613271 | Ina-Respond | Phase 3 |
| Terminated | Host Response Mediators in Coronavirus (COVID-19) Infection - Is There a Protective Effect of Losartan and Oth NCT04606563 | University of British Columbia | Phase 3 |
| Completed | The CHILD Cohort COVID-19 Add-On Study NCT05234359 | University of Manitoba | — |
| Unknown | Recovery of Exertion Ability Following COVID-19 Infection in Military Staff NCT04548505 | Direction Centrale du Service de Santé des Armées | — |
| Completed | The Effect of Melatonin and Vitamin C on COVID-19 NCT04530539 | Lancaster General Hospital | N/A |
| Completed | COVID-19-Related Health and Practices Among Dental Hygienists NCT04542915 | American Dental Association | — |
| Completed | Lung Ultrasound Findings in Patients With COVID-19 in a UK ED NCT05065827 | Chelsea and Westminster NHS Foundation Trust | — |
| Unknown | Home-based Exercise in COVID-19 Survivors NCT04615052 | University of Sao Paulo | N/A |
| Unknown | Adolescents With COVID-19/MIS-C at HCFMUSP NCT04659486 | University of Sao Paulo | N/A |
| Completed | Performance of a Remote Monitoring Program for Patients Diagnosed With COVID-19 NCT05063812 | George Washington University | — |
| Completed | Study of SARS-CoV2 Virus (COVID-19) Seroprevalence Among Lyon-Bron Military Health Schools Personnel NCT04516928 | Direction Centrale du Service de Santé des Armées | — |
| Completed | Reactogenicity, Safety and Immunogenicity of QazCovid-in® COVID-19 Vaccine NCT04530357 | Research Institute for Biological Safety Problems | Phase 1 / Phase 2 |
| Completed | Study of the Analytical Performance of Different Salivary Self-collection Methods for the Detection of COVID-1 NCT04550390 | Direction Centrale du Service de Santé des Armées | — |
| Unknown | Corona Virus Infection Among Liver Transplant Recipients NCT04565782 | Assiut University | — |
| Completed | The Effect of Vitamin D Therapy on Morbidity and Moratlity in Patients With SARS-CoV 2 Infection NCT04733625 | Kasr El Aini Hospital | N/A |
| Unknown | Impact of Perceived Control on Operational Strain: a Study of COVID-19 Pandemic Caregivers and Military Person NCT04517136 | Direction Centrale du Service de Santé des Armées | — |
| Completed | COVID-19 Persistence in Stool NCT04546776 | Quadram Institute Bioscience | — |
| Terminated | Can SARS-CoV-2 Viral Load and COVID-19 Disease Severity be Reduced by Resveratrol-assisted Zinc Therapy NCT04542993 | Swedish Medical Center | Phase 2 |
| Completed | Seroprevalence of SARS-CoV-2 in Unselected Surgical Patients: an Unicentric, Regional Study NCT04839913 | University of Cagliari | — |
| Unknown | Influence of Military Preventive Policy for reCruit Training on COVID-19 Seroconversion NCT04476680 | Royal Centre for Defence Medicine | N/A |
| Completed | Assessment of the Prevalence and the Impact of the COVID-19 Epidemic in the French Flight Crew in 2020 NCT04514874 | Direction Centrale du Service de Santé des Armées | — |
| Unknown | Impact of Severe Acute Respiratory Syndrome (SARS-CoV-2/COVID-19) Related Pneumonia on Lung Function and Struc NCT04916834 | National Institute for Tuberculosis and Lung Diseases, Poland | — |
| Completed | Randomized Phase IIA Clinical Trial to Evaluate the Efficacy of Ivermectin to Obtain Negative PCR Results in P NCT04635943 | Universidad Peruana Cayetano Heredia | Phase 2 |
| Completed | COVID-19 IgG Formation in Physicians at ALGH and Their Household Members NCT04540484 | Wake Forest University Health Sciences | — |
| Completed | Efficacy of L. Plantarum and P. Acidilactici in Adults With SARS-CoV-2 and COVID-19 NCT04517422 | AB Biotics, SA | N/A |
| Terminated | Serology to COVID-19 for Recording Exposures and Evaluating Needs NCT04566965 | Children's Hospital Medical Center, Cincinnati | — |
| Completed | Cross Sectional CFAR HIV/COVID-19 Study NCT04514016 | University of Miami | — |
| Completed | International Registry of Healthcare Workers Exposed to COVID-19 Patients (UNITY Global) NCT04626076 | Certara | — |
| Withdrawn | Tele-health Enabled Clinical Trial for COVID-19 NCT04489628 | University Hospitals Cleveland Medical Center | Phase 1 / Phase 2 |
| Completed | Co-Sér: Serological Analysis and Viral Neutralization in People With a Documented COVID-19 Infection NCT05000307 | University Hospital, Ghent | N/A |
| Completed | Brazilian Registry for Clinical Presentation of Individuals With COVID-19 (SARS-Brazil) NCT04479488 | Hospital Israelita Albert Einstein | — |
| Unknown | Turkish of the SARS-CoV-2 Anxiety Scale NCT04490473 | DILEK SAYIK | N/A |
| Withdrawn | Epidemiologic Assessment of SARS-CoV-2 (COVID-19) Prevalence in Minnesota NCT04473183 | University of Minnesota | — |
| Completed | COVID-19 Sero-prevalence Health Care Workers Kinshasa NCT04699058 | Institute of Tropical Medicine, Belgium | — |
| Completed | COVID-19 Seroprevalence Study in French Guiana NCT04490850 | Institut Pasteur | N/A |
| Completed | Lung Ultrasound Changes in Covid 19 Patients Discharged From Hospital NCT05062603 | Chelsea and Westminster NHS Foundation Trust | — |
| Unknown | Clinical Trial Evaluating the Effect of BCG Vaccination on the Incidence and Severity of SARS-CoV-2 Infections NCT04648800 | Hanna Czajka | Phase 3 |
| Recruiting | Prevalence and Outcome of SARS-CoV-2 Infection & COVID-19 in Transplant Recipients: The COVITRA Study NCT04579471 | Universitaire Ziekenhuizen KU Leuven | — |
| Completed | Treatment of Critically Ill Patients With Covid-19 With Convalescent Plasma NCT04468009 | Hospital de Infecciosas Francisco Javier Muniz | Phase 2 |
| Unknown | Prognostic Value of Flow-mediated Dilation in Hospitalized COVID-19 Patients NCT04714125 | University of Sao Paulo General Hospital | — |
| Unknown | HDL Target of CoViD19 ? Analysis on the Caregivers of the Reunion University Hospital NCT04384705 | Centre Hospitalier Universitaire de la Réunion | — |
| Terminated | Glycine Supplement for Severe COVID-19 NCT04443673 | Instituto Nacional de Enfermedades Respiratorias | N/A |
| Completed | Malaysian COVID-19 Anosmia Study (Phase 1) - A Nationwide Multicentre Cross-Sectional Study NCT04390165 | Hospital Sultanah Bahiyah | — |
| Unknown | Malaysian COVID-19 Anosmia Study (Phase 2) - A Nationwide Multicentre Case-Control Study NCT04384042 | Hospital Sultanah Bahiyah | — |
| Unknown | Hydroxychloroquine and Lopinavir/ Ritonavir to Improve the Health of People With COVID-19: "The Hope Coalition NCT04403100 | Cardresearch | Phase 3 |
| Unknown | Serologic Profile of SARS CoV2 in COVID-19 Patients With Systemic Diseases NCT04530461 | faida agili | — |
| Unknown | Remdesivir in COVID-19 Lahore General Hospital NCT04560231 | Lahore General Hospital | EARLY_Phase 1 |
| Withdrawn | LIBERATE Trial in COVID-19 NCT04334629 | King's College London | Phase 4 |
| Unknown | RT-PCR on Conjunctival Sample for the Detection of SARS-CoV-2 in Patients With Covid-19 NCT04397666 | Versailles Hospital | N/A |
| Withdrawn | A Registry Study of COVID-19 Serologic and Virologic Testing to Accelerate Recovery and Transition NCT04573634 | Jill M Kolesar | — |
| Unknown | Methylprednisolone in COVID-19 Patients (Methyl19LGH) NCT04559113 | Lahore General Hospital | N/A |
| Unknown | Analysis of the Quality and Quantity of Antibiotic Prescriptions for Bacterial Respiratory Tract Superinfectio NCT04544072 | Universitair Ziekenhuis Brussel | — |
| Unknown | Convalescent Plasma Therapy for COVID-19 Patients NCT04565197 | Lahore General Hospital | EARLY_Phase 1 |
| Unknown | High Flow Nasal Cannula HFNC In Covid-19 Patients NCT04560257 | Lahore General Hospital | N/A |
| Unknown | Tocilizumab in COVID-19 Lahore General Hospital NCT04560205 | Lahore General Hospital | Phase 1 |
| Completed | Methylprednisolone in the Treatment of Patients With Signs of Severe Acute Respiratory Syndrome in Covid-19 NCT04343729 | Fundação de Medicina Tropical Dr. Heitor Vieira Dourado | Phase 2 |
| Unknown | Electrocardiogram Analysis in COVID-19 Patients NCT04367129 | University Hospital of Ferrara | — |
| Completed | Losartan for Patients With COVID-19 Requiring Hospitalization NCT04312009 | University of Minnesota | Phase 2 |
| Completed | Italian Web-based Cross-sectional Survey on COVID-19 NCT04471701 | Institute of Biomedical Technologies-National Research Council, Italy | — |
| Completed | Losartan for Patients With COVID-19 Not Requiring Hospitalization NCT04311177 | University of Minnesota | Phase 2 |
| Terminated | Impact of Auricular Vagus Nerve Neuromodulation on COVID-19 Positive Inpatients Outcome NCT04341415 | Fondation Ophtalmologique Adolphe de Rothschild | N/A |
| Completed | Psychological Impact of COVID-19 Pandemic in Healthcare Workers NCT04506515 | Hospital General Universitario de Valencia | — |
| Completed | Chloroquine Diphosphate in the Prevention of SARS in Covid-19 Infection NCT04342650 | Fundação de Medicina Tropical Dr. Heitor Vieira Dourado | Phase 2 |
| Completed | Can the Electronic Nose Smell COVID-19? NCT04475562 | Maastricht University Medical Center | N/A |
| Completed | Can the Electronic Nose Smell COVID-19 Antibodies? NCT04475575 | Maastricht University Medical Center | N/A |
| Completed | Outcomes Related to COVID-19 Treated With Hydroxychloroquine Among In-patients With Symptomatic Disease NCT04332991 | Massachusetts General Hospital | Phase 3 |
| Completed | Risk of Venous Thromboembolism in Critically Ill Patients With Severe COVID-19 NCT04374617 | Hospital Universitari Vall d'Hebron Research Institute | — |
| Unknown | The Efficacy of Different Anti-viral Drugs in COVID 19 Infected Patients NCT04321616 | Oslo University Hospital | Phase 2 / Phase 3 |
| Completed | Cytokine Adsorption in Severe COVID-19 Pneumonia Requiring Extracorporeal Membrane Oxygenation NCT04324528 | Dr. Alexander Supady | N/A |
| Completed | Do Angiotensin Receptor Blockers Mitigate Progression to Acute Respiratory Distress Syndrome With SARS-CoV-2 I NCT04340557 | Sharp HealthCare | Phase 4 |
| Unknown | Pediatric Intensive Care and COVID-19 NCT04544878 | Bicetre Hospital | — |
| Terminated | Preemptive Therapy for SARS-Coronavirus-2 (COVID-19 PEP Canada) NCT04421664 | McGill University Health Centre/Research Institute of the McGill University Health Centre | Phase 3 |
| Completed | A Longitudinal Study of COVID-19 Positive Patients Testing Nasal Swabs and Collecting Blood Samples for Resear NCT04327804 | UnitedHealth Group | — |
| Completed | Chloroquine Diphosphate for the Treatment of Severe Acute Respiratory Syndrome Secondary to SARS-CoV2 NCT04323527 | Fundação de Medicina Tropical Dr. Heitor Vieira Dourado | Phase 2 |
| Completed | Household Transmission Investigation Study for COVID-19 in Tropical Regions NCT04328129 | Institut Pasteur | N/A |
| Completed | Michigan Medicine COVID-19 Cohort: Clinical Characteristics, Inflammatory Markers and Outcomes of Patients Hos NCT04706533 | University of Michigan | — |
| Completed | Post-exposure Prophylaxis / Preemptive Therapy for SARS-Coronavirus-2 NCT04308668 | University of Minnesota | Phase 3 |
| Completed | Characterizing the Immune Response and Neuronal Damage in COVID-19 NCT04510012 | Insel Gruppe AG, University Hospital Bern | — |
| Completed | COVID-19 Testing Sample Acquisition Throughput and Efficiency NCT04532411 | Massachusetts General Hospital | — |
| Completed | Tenofovir-DF Versus Hydroxychloroquine in the Treatment of Hospitalized Patients With COVID-19 (TEDHICOV) NCT04812496 | Hospital Nacional Carlos Alberto Seguin Escobedo - EsSalud | — |
| Unknown | Caracterisation of COVID-19 Patients Hospitalized in Infectious Disease Department NCT04779021 | Centre Hospitalier Universitaire de Nice | — |
| Unknown | RT-PCR Database Analysis for COVID-19 Infections and Re-infection NCT04653844 | University Hospital, Montpellier | — |
| Unknown | Human Epidemiology of Newly Identified Arboviruses NCT04954352 | University Hospital, Montpellier | — |
| Unknown | Outcomes Mandate National Integration With Cannabis as Medicine NCT03944447 | OMNI Medical Services, LLC | Phase 2 |
| No Longer Available | Investigational COVID-19 Convalescent Plasma Infusion for Severely or Life-threateningly Ill COVID-19 Patients NCT04420988 | Rutgers, The State University of New Jersey | — |