New DNA vaccine shows promise against deadly MERS virus
NCT ID NCT04588428
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This Phase 2 trial tested a new DNA vaccine called INO-4700 in 192 healthy adults to see if it is safe and can trigger an immune response against MERS, a serious coronavirus. The vaccine is given as a shot under the skin followed by a quick electric pulse to help cells take up the DNA. The study looked at side effects and measured antibodies and T-cell responses.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- INO-4700 (DNA vaccine given under the skin followed by a mild electric pulse to boost uptake)
- What this could lead to
- If successful, this could lead to a vaccine that protects people from MERS, a serious respiratory virus.
- What could go wrong
- This is a Phase 2 trial with only 192 healthy volunteers, so it is still early. The vaccine may not produce strong enough immunity or could cause side effects like injection site reactions.
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
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192 people
The number who actually took part.
- Started
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Jun 2021
- Finished
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Jan 2023
- 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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Accepted
You do not need to have the condition being studied to take part.
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.
Key Inclusion Criteria: * Judged to be healthy by the Investigator on the basis of medical history, physical examination and vital signs performed at Screening; * Able and willing to comply with all study procedures; * Screening laboratory results within normal limits; * Negative tests for Hepatitis B surface antigen (HBsAg), Hepatitis C antibody and Human Immunodeficiency Virus (HIV) antibody; * Screening electrocardiogram (ECG) deemed by the Investigator as having no clinically significant findings (e.g. Wolff-Parkinson-White syndrome); * Be post-menopausal or be surgically sterile or have a partner who is sterile or use medically effective contraception with a failure rate of \< 1% per year when used consistently and correctly from screening until 3 months following last dose. Key Exclusion Criteria: * Pregnant or breastfeeding, or intending to become pregnant or father children within the projected duration of the trial starting with the screening visit until 3 months following last dose; * History of respiratory diseases such as asthma, chronic obstructive pulmonary disease (COPD) or chronic bronchitis; * Currently participating in or has participated in a study with an investigational product within 30 days preceding Day 0; * Previous receipt of any vaccine within 30 days preceding Day 0 or planning to receive any vaccine during the timeframe restricted per the protocol; * Previous receipt of an investigational vaccine product for the prevention of MERS; * Prior exposure to MERS-CoV or camels; * Participants who participate in MERS-201 Part 1 cannot participate in MERS-201 Part 2; * Fewer than two acceptable sites available for ID injection and EP considering the deltoid and anterolateral quadriceps muscles; * Prisoner or participants who are compulsorily detained (involuntary incarceration); * Current or anticipated concomitant immunosuppressive therapy (excluding inhaled, topical skin and/or eye drop-containing corticosteroids) prior to dosing. Systemic corticosteroids must be discontinued at least 3 months prior to first dose; * Reported active drug or alcohol or substance abuse or dependence.
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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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Ahero Clincal Trials Unit
Kisumu, 40100, Kenya
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American University of Beirut Medical Center
Beirut, Lebanon
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Clinical Research Center, Irbid Specialty Hospital (CRC/ISH)
Irbid, 21110, Jordan
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Hammoud Hospital University Medical Center
Saida, Lebanon
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Kenya Medical Research Institute (KEMRI)/Walter Reed Project (WRP)
Kericho, 20200, Kenya
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Pharmaceutical Research Center / Jordan University of Science and Technology
Irbid, 22110, Jordan