A Study to Evaluate the Safety and Efficacy of mRNA-1345 Vaccine Targeting Respiratory Syncytial Virus (RSV) in Adults ≥60 Years of Age

  • End date
    Nov 30, 2024
  • participants needed
  • sponsor
    ModernaTX, Inc.
Updated on 22 March 2022
Accepts healthy volunteers


The main purpose of this study is to evaluate the safety and tolerability of mRNA-1345 vaccine and to demonstrate the efficacy of a single dose of mRNA-1345 vaccine in the prevention of a first episode of RSV-associated lower respiratory tract disease (RSV-LRTD) as compared with placebo from 14 days postinjection through 12 months.


The study will be conducted in 2 phases: Phase 2 and Phase 3. In the Phase 2 segment, between 400 and 2,000 participants will be randomly assigned to receive a single injection of either mRNA-1345 vaccine at the selected dose or placebo in a 1:1 randomization ratio.

In the Phase 3 segment, between 32,000 and 33,600 participants will be randomly assigned to receive a single injection of either mRNA-1345 vaccine at the selected dose or placebo in a 1:1 randomization ratio.

Condition Respiratory Syncytial Virus
Treatment Placebo, mRNA-1345
Clinical Study IdentifierNCT05127434
SponsorModernaTX, Inc.
Last Modified on22 March 2022


Yes No Not Sure

Inclusion Criteria

Adults ≥ 60 years of age who are primarily responsible for self-care and activities of daily living. Participants may have one or more chronic medical diagnoses (specifically chronic heart failure [CHF] and chronic obstructive pulmonary disease [COPD]), but should be medically stable as assessed by the following criteria: absence of changes in medical therapy within 1 month due to treatment failure or toxicity; absence of medical events qualifying as SAEs within 1 month of the planned study injection on Day 1; and absence of known, current, and life-limiting diagnoses, which could continue for the duration of the primary efficacy period (12 months from study injection on Day 1) and which, in the opinion of the investigator, would make completion of the protocol unlikely
Body mass index from ≥18 kilograms (kg)/square meter (m^2) to ≤35 kg/m^2

Exclusion Criteria

Participation in another clinical research study where participant has received an investigational product (drug/biologic/device) within 45 days before the planned date of the Day 1 vaccination
Prior participation in research involving receipt of any investigational RSV product (drug/biologic/device)
History of a serious reaction to any prior vaccination or Guillain-Barré syndrome within 6 weeks of any prior influenza immunization
Received or plans to receive any non-study vaccine within 28 days before or after the Day 1 study injection. The exceptions are seasonal influenza vaccines, pneumococcal vaccines, or authorized or approved vaccines for the prevention of COVID-19 (regardless of type of vaccine), which are not permitted within 14 days before or after the Day 1 study injection. Efforts should be made to space study injection and COVID-19 vaccination by at least 7 and preferably 14 days, but COVID-19 vaccination should not be delayed
Other inclusion and/or exclusion criteria may apply
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Additional screening procedures may be conducted by the study team before you can be confirmed eligible to participate.

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If you are confirmed eligible after full screening, you will be required to understand and sign the informed consent if you decide to enroll in the study. Once enrolled you may be asked to make scheduled visits over a period of time.

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Complete your scheduled study participation activities and then you are done. You may receive summary of study results if provided by the sponsor.

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