**Study Overview:** This study tests a vaccine called **MVA-BN-WEV** to prevent diseases caused by viruses called VEEV and EEEV in healthy adults aged 18-50. The vaccine aims to boost the body's immune system to protect against these viruses. It is a Phase 2 trial, meaning it's not the first time the vaccine is being tested, but it's still early in research. **Key Points:** - **Study Length:** Participants will be involved for a certain period to monitor safety and effectiveness. - **Eligibility:** Must be healthy adults aged 18-50, agree to use effective birth control if applicable, and have no major health issues. - **Exclusions:** Pregnant or breastfeeding women, those with immune system problems, recent live vaccinations, or specific health conditions are not eligible. Participants will need to read and sign a consent form to join. The study ensures privacy and has been explained in a language that participants understand. Compensation details, number of visits, and any risks will be clarified during the consent process.