Could a pill replace the COVID-19 booster shot?
NCT ID NCT06672055
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tests an experimental oral COVID-19 vaccine tablet (VXA-CoV2-3.3) against approved mRNA booster shots in about 5,500 adults who have already been vaccinated. The goal is to see if the tablet can prevent symptomatic COVID-19 as well as or better than the injectable vaccine. Participants will be randomly assigned to receive either the oral tablet or an mRNA booster, and researchers will track infections and side effects for up to a year.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- oral SARS-CoV-2 vaccine tablet (VXA-CoV2-3.3, KP.2 strain)
- What this could lead to
- If successful, this could offer a needle-free, easier-to-store COVID-19 booster option that may be more acceptable to people who avoid injections.
- What could go wrong
- This is a mid-stage trial, so the oral vaccine may not prove as effective as mRNA shots. Side effects or immune response differences could limit its use.
Why investors are watching
Vaxart is testing an oral COVID-19 vaccine tablet against a standard mRNA booster in a 5,485-person phase 2b trial. For a micro-cap company with no approved products, this readout is the main event: a positive result would show its tablet can protect against a current variant, while a negative one would leave the company without a clear path forward.
If it works: If the oral vaccine matches or beats the mRNA booster, Vaxart could have a product that is easier to store and administer, which might attract partners or buyers. That outcome would validate its technology and give the company a real asset.
If it fails: Trials fail often, and this one compares directly against a proven vaccine, so the bar is high. A failure or delay could leave Vaxart with no approved product and little reason for investors to stay.
AI-written from the trial record. Speculative, and not investment advice.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 2
Tests whether the treatment actually works, and watches for side effects, in a larger group.
- Participants
-
About 5,485 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Oct 2024
- Expected to finish
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May 2027
An estimate. End dates often move.
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. Adults 18 years of age and above, at time of screening. 2. Completed primary approved/authorized COVID-19 vaccination series and have received ≥ 2 mRNA vaccine doses. 3. Last COVID-19 vaccine received ≥6 months prior to study vaccination. 4. Male and female participants of childbearing potential must agree to consistently use a highly effective method of contraception from at least 30 days prior to enrollment and through 3 months after the last study vaccination. 5. Male participants must refrain from sperm donation from the day of study vaccination through the end of the study. Female participants must refrain from egg donation at least 30 days prior to study vaccination through the end of the study. 6. Is medically stable, as determined by the site investigator (based on review of health status, vital signs, medical history, and physical examination) with screening lab values within normal limits or abnormalities assessed as not clinically significant. Screening platelet count must be \>140,000/μL. 7. Agree to not participate in any other SARS-CoV-2 infection prevention trials (vaccine, drug, biologic, PReP) during participation in the study. 8. Willing and able to provide informed consent prior to initiation of study procedures. 9. Available for all study visits, willing to participate in all study procedures, and not planning to relocate from the area for the duration of the study. 10. Negative rapid antigen Covid test at the screening visit and on Day 1 prior to vaccine dosing. An indeterminate should be considered as positive for the purposes of screen-failing participants. Exclusion Criteria: 1. Participant has an acute illness as defined by any of the following (note: assessment may be repeated once during screening period) as determined by the site investigator, within 72 hours prior to vaccination: 1. An acute illness that is nearly resolved, with only minor residual symptoms remaining, is allowable if, in the opinion of the site investigator, the residual symptoms will not interfere with the ability of study staff to assess safety parameters as required by the protocol. 2. Presence of a fever ≥ 38.0°C (100.4°F) measured orally at baseline, on Day 1 prior to vaccination. 3. Receipt of antipyretic/analgesic medications within 24 hours prior to vaccine administration. 2. Participant has had a positive COVID test within 90 days prior to screening. 3. Current or planned participation in any other interventional clinical trial. 4. Participation in research involving any investigational product within 45 days prior to study vaccination. 5. Receipt of any approved or authorized products intended to prevent SARS-CoV2 infection within 6 months prior to study vaccination. 6. Receipt or donation of blood products or immunoglobulins within 60 days prior to enrollment or planned administration during the study. 7. Received influenza vaccination within 14 days prior to study vaccination, or any other vaccine within 30 days prior to study vaccination. 8. Any autoimmune or immunodeficiency disease/condition (including and not limited to untreated or advanced HIV infection with CD4 counts \<200 cells/mm\^3, history of AIDS defining illness without immune reconstitution, or clinical manifestations of symptomatic HIV, severe combined immunodeficiency (SCID), hypogammaglobulinemia, asplenia or functional asplenia). Gout managed only for elevated uric acid without gout flares would not be exclusionary, provided no prohibited medications were used. 9. Unstable medical or psychiatric illness (acute or chronic illness) requiring significant medical monitoring and intervention during the 90 days prior to enrollment. Note: diabetes mellitus (Types 1 \& 2) are not excluded if assessed by the principal investigator (PI) as well-controlled. 10. Administration of immunosuppressants, systemic glucocorticoids, or other immune-modifying drugs within the following timeframes: 1. B-cell therapies within the 6 months prior to first study vaccination 2. Prednisone, ≥20 mg for more than 2 weeks, within the 30 days prior to study vaccination 3. Other medications in this category, including but not limited to high-dose inhaled corticosteroids (\>800 mcg/day of beclomethasone dipropionate or equivalent); antimetabolites; transplant immunosuppressive agents; alkylating agents; cell-depleting agents; or cancer chemotherapeutics, within the 90 days prior to study vaccination. 4. Any medication for any period of time that, in the opinion of the site investigator, could impede immune response to vaccination. 5. Use of any dose montelukast OR inhaled, intranasal, intra-articular, or systemic corticosteroids within 2 weeks prior to study vaccination. 6. Planned use of any of the above medications during the study. 7. Concomitant allergen immunotherapy (AIT) will be allowed only if the participant is stable in the maintenance phase of AIT. Maintenance AIT should not be dosed for at least 7 days before and 7 days after study vaccine dosing, and the PI must document the treating allergist's approval. 11. Known contraindication to IM injection or blood draws (e.g. bleeding diathesis, acquired coagulopathy, significant bleeding or bruising) or to oral route of administration (unable to swallow tablets). 12. Any known allergies to components contained in the investigational product or comparator or latex allergy (including polyethylene glycol \[PEG\] allergies) and/or history of serious reactions to vaccination such as anaphylaxis, respiratory problems, hives, or abdominal pain. 13. Women who are pregnant (pregnancy tests will be performed at screening and prior to dosing), breastfeeding, or who plan to become pregnant during the study. 14. History of irritable bowel disease or other inflammatory digestive or gastrointestinal condition that could affect the distribution/safety evaluation of an orally administered vaccine targeting the mucosa of the small intestine. Such conditions may include but are not limited to: 1. Any history of: * GI malignancy * malabsorption * pancreatobiliary disorders * inflammatory bowel disease * irritable bowel disease * hiatal hernia * surgical resection 2. History of diagnosis or treatment in past 5 years of: * esophageal or gastric motility disorder * gastroesophageal reflux disorder if any of the following is met: History of severe or uncontrolled gastroesophageal reflux disease (GERD) at any point during this period History of complicated GERD at any point during this period Was on treatment for 12 continuous weeks at any point during this period Has been with chronic or frequent GERD symptoms (e.g., more than twice per week) in the past year * peptic ulcer if any of the following is met: History of severe or uncontrolled peptic ulcer at any point during this period History of complicated peptic ulcer at any point during this period Was on treatment for 12 continuous weeks at any point during this period Has been with chronic or frequent peptic ulcer symptoms (e.g., more than twice per week) in the past year * cholecystectomy, if any of the following is met: Procedure was performed within 1 year of dosing, or The participant has ongoing/unresolved post-cholecystectomy digestive symptoms within 30 days prior to dosing 15. Use of oral or parenterally administered antibiotics, proton pump inhibitors, H2 blockers, or antacids within 7 days prior to study drug administration or planned use from dosing through Day 31. 16. Use of drugs known to affect gastrointestinal motility including glucagon-like peptide 1 (GLP-1) receptor agonists including tirzepatide (Mounjaro) and semaglutide (Wegovy, Ozempic) within 30 days prior to drug administration. The participant may resume GLP-1 receptor agonists only if all solicited symptoms have completely resolved, with the earliest restart date being Day 9. 17. Daily use (2 or more consecutive days) of nonsteroidal anti-inflammatory drugs within 7 days prior to study drug administration through Day 8 (7 days post-vaccination). Low dose daily ASA ≤ 100 mg for cardio-protection is not exclusionary. 18. Personal or familial history of hypercoagulable states to include personal past history of deep vein thrombosis (DVT). 19. Personal history of myocarditis or pericarditis. 20. Positive Hepatitis B surface antigen (HBsAg), or hepatitis C virus (HCV) antibody at the screening visit. Confirmation of positive results with molecular testing is not required. 21. History of drug, alcohol, or chemical abuse within 1 year of screening. 22. Positive urine drug screen for drugs of abuse at screening, except in case of occasional marijuana use. Chronic marijuana use (as determined by the investigator's discretion) or a known history of marijuana abuse in the setting of a positive test is exclusionary. Concurrent or planned use of marijuana from dosing through Day 31 is prohibited. Positive urine drug screen (UDS) at screening due to prescribed stimulants will be reviewed on a case by case basis with the Medical Monitor's approval. 23. Cancer, or treatment for cancer, within the past 3 years (excluding fully treated and resolved basal cell carcinoma or squamous cell carcinoma). 24. History of any form of angioedema. 25. History of GI bleeding including hematochezia (blood in stool) or melena (black stool) of unknown etiology or that has not been evaluated. 26. Any history or conditions that may lead to a higher risk of clotting events and/or thrombocytopenia, including: 1. Familial coagulopathy or personal history of bleeding disorder or thrombosis. A personal history of stroke, myocardial infarction, or similar condition may not be exclusionary if the participant is medically stable and not receiving a prohibited medication such as an anticoagulant or thrombolytic (low dose prophylactic aspirin is permitted) 2. History of heparin-related thrombotic events, and/or receiving heparin treatments 3. History of autoimmune or inflammatory disease 4. Presence of any of the following conditions known to increase the risk of thrombosis within 6 months prior to screening: * Recent surgery other than fully healed cesarean delivery, excision/ biopsy of cutaneous lesions or other procedures that do not require general anesthetic and/or prolonged immobility * Immobility (confined to bed or wheelchair for 3 or more successive days) * Head trauma with loss of consciousness or documented brain injury * Receipt of anticoagulants for prophylaxis of thrombosis (low dose aspirin is permitted) * Recent clinically significant infection including hospitalization for COVID-19 related illness. 27. Any other condition that, in the opinion of the investigator, would pose a health risk to the participant if enrolled or could interfere with evaluation of the investigational product or interpretation of study results. 28. Study team member or first-degree relative of any study team member (inclusive of sponsor and site personnel involved in the study).
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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AMR - El Dorado - Heartland Research Associates
El Dorado, Kansas, 67042, United States
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AMR - Fort Myers - Clinical Physiology Associates
Fort Myers, Florida, 33912, United States
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AMR - Lexington (Central Kentucky Research Associates)
Lexington, Kentucky, 40509, United States
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AMR - Miami (Clinical Research of South Florida)
Coral Gables, Florida, 33134, United States
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AMR - New Orleans - Center for Clinical Research
New Orleans, Louisiana, 70119, United States
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AMR - Newton (Heartland Research Associates)
Newton, Kansas, 67114, United States
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AMR - Norfolk (Clinical Research Associates of Tidewater)
Norfolk, Virginia, 23502, United States
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AMR - Wichita East - Heartland Research Associates
Wichita, Kansas, 67207, United States
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AMR - Wichita West - Heartland Research Associates
Wichita, Kansas, 67205, United States
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AXCES Research & Health - Santa Fe
Santa Fe, New Mexico, 87505, United States
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Accel Research Sites (ARS) - St. Petersburg - Largo
Largo, Florida, 33777, United States
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Accel Research Sites - Lakeland
Lakeland, Florida, 33803, United States
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Accel Research Sites - Maitland
Maitland, Florida, 32751, United States
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Accellacare - Charleston
Mt. Pleasant, South Carolina, 29464, United States
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Accellacare - Duly Health and Care
Lombard, Illinois, 60148, United States
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Accellacare - Hickory
Hickory, North Carolina, 28601, United States
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Accellacare - McFarland Clinic
Ames, Iowa, 50010, United States
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Accellacare - PMG Research of Bristol
Bristol, Tennessee, 37620, United States
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Accellacare - Piedmont Healthcare
Statesville, North Carolina, 28625, United States
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Accellacare - Raleigh
Raleigh, North Carolina, 27609, United States
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Accellacare - Rocky Mount
Rocky Mount, North Carolina, 27804, United States
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Accellacare - Salisbury
Salisbury, North Carolina, 28144, United States
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Accellacare - Tradd Court
Wilmington, North Carolina, 28401, United States
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Accellacare - Winston-Salem
Winston-Salem, North Carolina, 27103, United States
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Accellacare of Knoxville
Knoxville, Tennessee, 37912, United States
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Alliance for Multispecialty Research (AMR) - Corporate
Knoxville, Tennessee, 37909, United States
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Altasciences Los Angeles (Formerly WCCT Global)
Cypress, California, 90630, United States
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Ark Clinical Research - Fountain Valley, CA
Fountain Valley, California, 92708, United States
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Ark Clinical Research - Long Beach, CA
Long Beach, California, 90815, United States
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Atlas Clinical Research - Rochester Clinical Research
Rochester, New York, 14609, United States
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Atlas Clinical Research - Suburban Research Associates - Media Office
Media, Pennsylvania, 19063, United States
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Atlas Clinical Research - Suncoast Clinical Research - Pasco County
New Port Richey, Florida, 34652, United States
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Atrium Health Wake Forest Baptist - Comprehensive Cancer Center
Winston-Salem, North Carolina, 27157, United States
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Avacare (CCT) - Advanced Primary and Geriatric Care
Rockville, Maryland, 20850, United States
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Avacare (CCT) - Clay Platte Family Medicine Clinic
Kansas City, Missouri, 64151, United States
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Avacare (CCT) - Fiel Family & Sports Medicine
Tempe, Arizona, 85283, United States
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Avacare (CCT) - Hatboro Medical Associates
Hatboro, Pennsylvania, 19040, United States
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Avacare (CCT) - Lifeline Primary Care
Lilburn, Georgia, 30047, United States
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Avacare (CCT) - Ogden Clinic - Grand View
Roy, Utah, 84067, United States
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Avacare (CCT) - Olympus Family Medicine
Salt Lake City, Utah, 84117, United States
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Avacare (CCT) - Skyline Medical Center
Elkhorn, Nebraska, 68022, United States
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Avacare - Benchmark Research - Metairie
Metairie, Louisiana, 70006, United States
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Avacare - Benchmark Research - New Orleans-North Shore
Covington, Louisiana, 70433, United States
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Avacare - Benchmark Research - SOCAL-Colton
Colton, California, 92324, United States
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Avacare - Benchmark Research - Sacramento
Sacramento, California, 95864, United States
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Avacare - Benchmark Research Fort Worth
Fort Worth, Texas, 76135, United States
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Avacare - Critical Care, Pulmonary and Sleep Associates
Lakewood, Colorado, 80228, United States
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Avacare - Lenzmeier Family Medicine
Glendale, Arizona, 85308, United States
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Baptist Health Center for Clinical Research - Little Rock
Little Rock, Arkansas, 72205, United States
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Be Well Clinical Studies - Nebraska
Lincoln, Nebraska, 68516, United States
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Biscayne Clinical Research
North Miami Beach, Florida, 33169, United States
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Boca Raton Clinical Research (BRCR) Global - Weston
Plantation, Florida, 33322, United States
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Boca Raton Clinical Research (BRCR) Global USA - New Orleans
Gretna, Louisiana, 70053, United States
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CTI Clinical Research Center
Cincinnati, Ohio, 45212, United States
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Cary Medical Group
Cary, North Carolina, 27518, United States
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Cedar Health Research - Arlington/Euless
Euless, Texas, 76040, United States
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Centricity Research (IACT Health) - Suffolk Primary Care
Suffolk, Virginia, 23435, United States
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Chase Medical Research
Waterbury, Connecticut, 06708, United States
-
Coastal Clinical Research
Mobile, Alabama, 36608, United States
-
Core Clinical Trials - Central Alabama Research LLC
Birmingham, Alabama, 35209-8401, United States
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DM Clinical Research - CyFair Clinical Research Center
Houston, Texas, 77065, United States
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DM Clinical Research - Jersey City
Jersey City, New Jersey, 07306, United States
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DM Clinical Research - Tomball - Multiple Specialties
Tomball, Texas, 77375, United States
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Desert Clinical Research
Mesa, Arizona, 85213, United States
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ENCORE - Nature Coast Clinical Research Inverness
Inverness, Florida, 34452, United States
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ENCORE - St. Johns Center for Clinical Research
Saint Augustine, Florida, 32086, United States
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ENCORE - Westside Center for Clinical Research
Jacksonville, Florida, 32205, United States
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Elite Research Network (ERN) - Legacy Clinical Trials
Colorado Springs, Colorado, 80909, United States
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Elligo Health Research (BTC/ClinEdge) - Core Healthcare Group
Cerritos, California, 90703, United States
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EmVenio Research - Fort Worth, TX
Fort Worth, Texas, 76134, United States
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Fleming Island Center For Clinical Research
Fleming Island, Florida, 32003, United States
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Foothills Research Center
Phoenix, Arizona, 85044, United States
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Headlands Research - JEM Research - Lake Worth
Lake Worth, Florida, 33462, United States
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Health Research of Hampton Roads
Newport News, Virginia, 23606, United States
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IMA Clinical Research - Albany, Suite 202
Albany, New York, 12205, United States
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IMA Clinical Research - Austin
Austin, Texas, 78745, United States
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IMA Clinical Research - Chicago
Chicago, Illinois, 60602, United States
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IMA Clinical Research - Manhattan
New York, New York, 10036, United States
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IMA Clinical Research - St. Petersburg
St. Petersburg, Florida, 33704, United States
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Jacksonville Center for Clinical Research
Jacksonville, Florida, 32216, United States
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Javara Research - Mankato Clinic
Mankato, Minnesota, 56001, United States
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Javara Research - Privia Medical Group Georgia
Fayetteville, Georgia, 30214, United States
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Javara Research - Privia Medical Group Mid-Atlantic - Annapolis
Annapolis, Maryland, 21401, United States
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Johnson County Clin-Trials
Lenexa, Kansas, 66219, United States
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K2 Medical Research - Maitland
Maitland, Florida, 32751, United States
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K2 Medical Research - South Orlando
Orlando, Florida, 32806, United States
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Northern California Research
Sacramento, California, 95821, United States
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Orion Clinical Research
Austin, Texas, 78759, United States
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PanAmerican Clinical Research - Brownsville, Levee Street
Brownsville, Texas, 78520, United States
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Paradigm Clinical Research - Wheat Ridge
Wheat Ridge, Colorado, 80033, United States
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Pharmaron
Baltimore, Maryland, 21201, United States
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Pinnacle Research Group
Anniston, Alabama, 36207, United States
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Privia Health - SouthCoast Health
Fayetteville, Georgia, 30214, United States
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SRA Trials LLC - Miami Clinical Trials at Suncoast Research Associates
Miami, Florida, 33173, United States
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South Ogden Family Medicine
South Ogden, Utah, 84405, United States
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Stamford Therapeutics Consortium
Stamford, Connecticut, 06905, United States
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Tekton Research - Austin
Austin, Texas, 78745, United States
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Tekton Research - Beaumont
Beaumont, Texas, 77706, United States
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Tekton Research - Colorado - Longmont
Longmont, Colorado, 80501, United States
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Tekton Research - Delaware Pointe
Tulsa, Oklahoma, 74137, United States
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Tekton Research - Fort Collins
Fort Collins, Colorado, 80528, United States
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Tekton Research - Fredericksburg Road
San Antonio, Texas, 78229, United States
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Tekton Research - Oklahoma - Magnolia Court
Moore, Oklahoma, 73160, United States
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Tekton Research - Oklahoma - Primary Health Partners
Yukon, Oklahoma, 73099, United States
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Trial Management Associates - Myrtle Beach
Myrtle Beach, South Carolina, 29572, United States
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Universal Axon Clinical Research
Doral, Florida, 33166, United States
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Velocity (Meridian) Clinical Research - Baton Rouge
Baton Rouge, Louisiana, 70809, United States
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Velocity (Meridian) Clinical Research - Grand Island
Grand Island, Nebraska, 68803, United States
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Velocity (Meridian) Clinical Research - Omaha
Omaha, Nebraska, 68134, United States
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Velocity (Meridian) Clinical Research - Rockville
Rockville, Maryland, 20854, United States
-
Velocity (Meridian) Clinical Research - Sioux City
Sioux City, Iowa, 51106, United States
-
Velocity Clinical Research (National Research Institute) - Panorama City
Los Angeles, California, 90057, United States
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Velocity Clinical Research - Abilene
Abilene, Texas, 79606, United States
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Velocity Clinical Research - Alburquerque
Albuquerque, New Mexico, 87107, United States
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Velocity Clinical Research - Anderson
Anderson, South Carolina, 29621, United States
-
Velocity Clinical Research - Austin
Austin, Texas, 78759, United States
-
Velocity Clinical Research - Boise (Meridian)
Meridian, Idaho, 83642, United States
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Velocity Clinical Research - Charleston
Charleston, South Carolina, 29414, United States
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Velocity Clinical Research - Chula Vista (eStudySite - Chula Vista)
Chula Vista, California, 91911, United States
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Velocity Clinical Research - Cincinnati (New Horizons Clinical Research - Blue Ash)
Cincinnati, Ohio, 45242, United States
-
Velocity Clinical Research - Cleveland (Rapid Medical Research)
Beachwood, Ohio, 44122, United States
-
Velocity Clinical Research - Columbia (VitaLink)
Columbia, South Carolina, 29204, United States
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Velocity Clinical Research - Durham
Durham, North Carolina, 27701, United States
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Velocity Clinical Research - Gardena
Santa Ana, California, 92704, United States
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Velocity Clinical Research - Grants Pass
Grants Pass, Oregon, 97527, United States
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Velocity Clinical Research - Hallandale Beach (MD Clinical)
Hallandale, Florida, 33009, United States
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Velocity Clinical Research - MedPharmics - Covington
Covington, Louisiana, 70433, United States
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Velocity Clinical Research - MedPharmics - Gulfport
Gulfport, Mississippi, 39503, United States
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Velocity Clinical Research - MedPharmics - Lafayette
Lafayette, Louisiana, 70508, United States
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Velocity Clinical Research - MedPharmics - Phoenix
Phoenix, Arizona, 85020, United States
-
Velocity Clinical Research - Medford
Spokane, Washington, 99204, United States
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Velocity Clinical Research - New Smyrna Beach
Edgewater, Florida, 32132, United States
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Velocity Clinical Research - Providence (East Greenwich)
East Greenwich, Rhode Island, 02818, United States
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Velocity Clinical Research - San Diego (eStudySite - La Mesa)
La Mesa, California, 91942, United States
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Velocity Clinical Research - Savannah
Savannah, Georgia, 31406, United States
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Velocity Clinical Research - Spokane
Spokane, Washington, 99204, United States
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Velocity Clinical Research - Syracuse
East Syracuse, New York, 13057, United States
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Velocity Clinical Research - Union (Vitalink)
Union, South Carolina, 29379, United States
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Velocity Clinical Research - Valparaiso (Buynak Clinical Research)
Valparaiso, Indiana, 46383, United States
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Velocity Clinical Research - Waco (formerly: Impact Research Institute)
Waco, Texas, 76710, United States
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Velocity Clinical Research - Washington DC
Washington D.C., District of Columbia, 20016, United States
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hyperCORE - ActivMed Practices and Research - Portsmouth
Portsmouth, New Hampshire, 03801, United States
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hyperCORE - Centricity Research (IACT Health) - Rincon
Rincon, Georgia, 31326, United States
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hyperCORE - Centricity Research Columbus
Columbus, Georgia, 31904, United States
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hyperCORE International - Coastal Carolina Research Center
North Charleston, South Carolina, 29405, United States
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