This study looks at how safe and effective a new vaccine is for RSV, a virus that causes lung infections, using mRNA technology. mRNA is a type of molecule that helps make proteins in the body. The study is for healthy people aged 18-45. Participants need to visit the clinic for follow-ups and use an eDiary to record their experiences. To join, you must be healthy, not allergic to the vaccine's ingredients, and not have any serious health issues. If you're a woman of childbearing age, you'll need a negative pregnancy test and must use contraception. You can't join if you've had certain vaccines or medications recently, or if you're pregnant or breastfeeding.

• Length of Study: The study involves several visits and requires participants to complete a diary.
• Compensation: Participants might receive compensation for their time and involvement.
• Risks: Possible side effects include reactions to the vaccine ingredients, but serious health problems are excluded.