Phase 2 Study Of VLA15, A Vaccine Candidate Against Lyme Borreliosis, In A Healthy Pediatric And Adult Study Population

Inclusion Criteria: * Subject is aged 5 to 65 years at the day of screening (Visit 0) * Subject is of good general health * Parent(s)/legal representative(s) and subject understand the study and its procedures, agree to its provisions * for subjects aged 18-65 years: written informed consent prior to any study related procedures * for subjects aged 5-17 years: written informed consent by the subject's legal representative(s), according to local requirements, and written informed assent of the subject, if applicable, prior to any study related procedures. * If subject is of childbearing potential: Subject has a negative serum pregnancy test at screening (Visit 0) and agrees to employ adequate birth control measures according to following timelines: * Main Study Phase: duration of entire study * Booster Phase: until 5 months after each booster vaccination (Booster 1 until Month 23, Booster 2 until Month 35 and Booster 3 until Month 47) * Subject is willing and able to comply with scheduled visits, treatment plan, and other study procedures * Subject is available for the duration of the study and can be contacted by telephone during study participation Exclusion Criteria: * Subject has a chronic illness related to Lyme borreliosis (LB), an active symptomatic LB, or received treatment for LB within the last 3 months prior to Day 1; * Subject received previous vaccination against LB; * Subject had a tick bite within 4 weeks prior to Day 1; * Subject has a medical hist…