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A Safety, Tolerability, and Immunogenicity Study of mRNA-1345 and mRNA-1365 in Participants Aged 5 Months to <24 Months
EU CTIS ID: 2022-502022-41-00
What this study is testing
To evaluate the safety and reactogenicity of study injections
- Human Pharmacology (Phase I)- Other
A plain-language read of the study's public EU CTIS listing. The study team confirms the details.
Who can take part
You may be able to join if
- The participant is male or female, 8 months to <24 months (Part A) or, 5 months to <8 months (Part B), 8 months to <12 months (Part C), or 5 months to <24 months (Part D) of age at the time of randomization (Day 1/Baseline visit), who is in good general health, in the opinion of the Investigator, based on review of medical history and screening physical examination. Common benign infant conditions (eg, mild to moderate GERD or atopic dermatitis not interfering with injection-site assessment) are allowed.
- In the Investigator’s opinion, the parent(s)/LAR(s) understand and are willing and physically able to comply with protocol-mandated follow up, including all procedures, and provide written informed consent.
- The participant is growing normally for age in the opinion of the site clinician in the months prior to enrollment.
- The participant was born at full-term (≥37 weeks gestation) with a minimum birth weight of 2.5 kg.
- Participant’s parent(s)/LAR(s) must have access to a consistent means of contact either by telephone contact or email/computer.
- Part C Cohort 7 and Part D Cohorts 11 and 12: participant must have received nirsevimab ≥6 months prior to Day 1 Visit.
You likely can't join if
- Has a known history of symptomatic RSV (Part A: within 3 months; Part B, Part C, and Part D: since birth) or hMPV infection (Part A: within 3 months; Part B: since birth) prior to administration of the first dose of IP or has a known close contact with anyone with laboratory-confirmed RSV (Parts A, B, C, and D) or hMPV infection (Parts A or B) within 14 days prior to administration of the first dose of IP.
- Is an immediate family member, or household contact, of an employee of the study site or the Sponsor or someone otherwise directly involved with the conduct of the study. As applicable, family members/household contacts of employees of the larger institution or affiliated private practice not part of the study site may be enrolled if the Investigator does not have any influence over their employment status.
- A child who has been placed under the control or protection of an agency, organization, institution, or entity by the courts, the government, or a government body acting in accordance with powers conferred on them by laws and regulation (eg, foster care). This does not include a child who is adopted or has an appointed legal guardian.
- Is acutely ill or febrile 24 hours prior to or at the Screening Visit. Fever is defined as a body temperature ≥38.0°C/ ≥100.4°F. Participants who meet this criterion may have visits rescheduled within the relevant study visit windows. Participants who are afebrile with minor illnesses can be enrolled at the discretion of the Investigator.
- Has previously been administered an investigational or approved vaccine for prevention of RSV (Parts A, B, C, and D) or hMPV (Parts A and B) infection or if the participant’s mother received an investigational or approved vaccine for the prevention of RSV (Part A, B, C, and D) or hMPV (Parts A and B) infection during pregnancy. a. Part D (Cohorts 9 and 10): Use of approved vaccine during pregnancy for the prevention of RSV infection is allowed.
- Has received investigational or approved agents for prophylaxis against RSV or hMPV (eg, monoclonal antibodies), or is intending to receive these during the course of the study. a. Part C (Cohort 7 only) and Part D (Cohorts 11 and 12 only): Use of nirsevimab ≥6 months before Day 1 Visit is allowed.
See the full eligibility criteria
Who can join
- The participant is male or female, 8 months to <24 months (Part A) or, 5 months to <8 months (Part B), 8 months to <12 months (Part C), or 5 months to <24 months (Part D) of age at the time of randomization (Day 1/Baseline visit), who is in good general health, in the opinion of the Investigator, based on review of medical history and screening physical examination. Common benign infant conditions (eg, mild to moderate GERD or atopic dermatitis not interfering with injection-site assessment) are allowed.
- In the Investigator’s opinion, the parent(s)/LAR(s) understand and are willing and physically able to comply with protocol-mandated follow up, including all procedures, and provide written informed consent.
- The participant is growing normally for age in the opinion of the site clinician in the months prior to enrollment.
- The participant was born at full-term (≥37 weeks gestation) with a minimum birth weight of 2.5 kg.
- Participant’s parent(s)/LAR(s) must have access to a consistent means of contact either by telephone contact or email/computer.
- Part C Cohort 7 and Part D Cohorts 11 and 12: participant must have received nirsevimab ≥6 months prior to Day 1 Visit.
- Part C Cohort 8: participant was eligible at any time since birth, according to national guidelines, to receive nirsevimab prior to Day 1 Visit but did not do so.
What rules you out
- Has a known history of symptomatic RSV (Part A: within 3 months; Part B, Part C, and Part D: since birth) or hMPV infection (Part A: within 3 months; Part B: since birth) prior to administration of the first dose of IP or has a known close contact with anyone with laboratory-confirmed RSV (Parts A, B, C, and D) or hMPV infection (Parts A or B) within 14 days prior to administration of the first dose of IP.
- Is an immediate family member, or household contact, of an employee of the study site or the Sponsor or someone otherwise directly involved with the conduct of the study. As applicable, family members/household contacts of employees of the larger institution or affiliated private practice not part of the study site may be enrolled if the Investigator does not have any influence over their employment status.
- A child who has been placed under the control or protection of an agency, organization, institution, or entity by the courts, the government, or a government body acting in accordance with powers conferred on them by laws and regulation (eg, foster care). This does not include a child who is adopted or has an appointed legal guardian.
- Is acutely ill or febrile 24 hours prior to or at the Screening Visit. Fever is defined as a body temperature ≥38.0°C/ ≥100.4°F. Participants who meet this criterion may have visits rescheduled within the relevant study visit windows. Participants who are afebrile with minor illnesses can be enrolled at the discretion of the Investigator.
- Has previously been administered an investigational or approved vaccine for prevention of RSV (Parts A, B, C, and D) or hMPV (Parts A and B) infection or if the participant’s mother received an investigational or approved vaccine for the prevention of RSV (Part A, B, C, and D) or hMPV (Parts A and B) infection during pregnancy. a. Part D (Cohorts 9 and 10): Use of approved vaccine during pregnancy for the prevention of RSV infection is allowed.
- Has received investigational or approved agents for prophylaxis against RSV or hMPV (eg, monoclonal antibodies), or is intending to receive these during the course of the study. a. Part C (Cohort 7 only) and Part D (Cohorts 11 and 12 only): Use of nirsevimab ≥6 months before Day 1 Visit is allowed.
- Has a known hypersensitivity to a component of the vaccine or its excipients. Hypersensitivity includes, but is not limited to, anaphylaxis or immediate allergic reaction of any severity to a previous dose of an mRNA vaccine or any of its components (including polyethylene glycol or immediate allergic reaction of any severity to polysorbate).
- Has a medical condition that, according to the Investigator’s judgment, may pose additional risk as a result of participation, interfere with safety assessments, or interfere with interpretation of results.
- Has a history of diagnosis or condition that, in the judgment of the Investigator, may affect study endpoint assessment or compromise participant safety, specifically the following: a. Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination. b. Serious chronic illness c. Major congenital defects d. History of any neurological disorders or seizures e. History of or current autoimmune disease f. History of recurrent wheezing (wheezing should have been verified on auscultation by a doctor) g. History of chronic cough (8 weeks or more duration) h. Previous hospitalization for respiratory illnesses i. History of thrombocytopenia j. History of anemia k. Neurological complications following any prior vaccination l. Born to a mother known or suspected to be HIV positive or Hepatitis C positive (no laboratory testing required) m. Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history and physical examination (no laboratory testing required) n. Chronic hepatitis or suspected active hepatitis o. A bleeding disorder that is considered a contraindication to IM injection or phlebotomy p. Dermatologic conditions that could affect local solicited AR assessments q. Family history of congenital or hereditary immunodeficiency
- Has received the following: a. Planned administration/administration of a vaccine not foreseen by the study protocol in the period starting 14 days prior through 7 days after IP administration. b. Systemic immunosuppressants or immune-modifying drugs for >14 days in total within 6 months prior to the day of enrollment (for corticosteroids, ≥1 mg/kg/day or ≥10 mg/day prednisone equivalent, if participant weighs >10 kg). Participants may have visits rescheduled for enrollment if they no longer meet this criterion within the Screening Visit window. Inhaled, nasal, and topical steroids are allowed. c. Intravenous or subcutaneous blood products (red cells, platelets, immunoglobulins) within 3 months prior to enrollment.
- Has participated in an interventional clinical study within 28 days prior to the Screening Visit or plans to do so while participating in this study.
The study team makes the final eligibility decision.
Where it's taking place
- Canada
- United Kingdom
- Australia
- South Africa
- United States
- Panama
Questions & answers
Do participants get paid in this trial?
This listing doesn't specify compensation. Many trials still reimburse travel or offer a stipend, so it's worth asking the study team when you connect.
Is it free to join, and do I need insurance?
Searching and applying through BridgeMD is free. In clinical trials the study-related treatment and visits are generally provided at no cost to you. You usually don't need insurance to take part - confirm specifics with the study team.
How long does this study last?
The listing doesn't state an exact length. The study team walks you through the schedule and number of visits before you decide to enroll.
Who can join this trial?
This study is enrolling all sexes, 0-17 years. The study team makes the final eligibility decision.
Where is this trial taking place?
Study sites include Canada; United Kingdom; Australia; South Africa; United States; Panama. Enter your location above to see the nearest site and check your eligibility.
Explore other conditions
BridgeMD is an information and trial-matching tool - not medical advice, and not the study sponsor. Details come from EU CTIS; the study team decides eligibility.