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

VLA15-221 is a Phase 2 study, which will be conducted in two parts: Main Study Phase (Part A) and Booster Phase (Part B). The study will compare the safety and immunogenicity of two different primary immunization schedules applying three (Month 0-2-6) or two (Month 0- 6) vaccinations. Within the study, 600 healthy subjects aged 5-65 years will be included. Subjects with a history of Lyme borreliosis (previous infection with Borrelia) as well as Borrelia naïve subjects will be enrolled. Study duration per subject will be a maximum of 50 months per subject.

VLA15-221 is a randomized, observer-blind, placebo controlled, multicenter Phase 2 study, which is set up in two parts: Main Study Phase (Part A) and Booster Phase (Part B). In Part A 600 subjects aged 5-65 years will be enrolled 1:1:1 into three groups: Group 1 will be vaccinated with VLA15 at Month 0-2-6, Group 2 will be vaccinated with VLA15 at Month 0-6 and with placebo at Month 2 and Group 3 will be vaccinated with placebo at Month 0-2-6. In Part B all eligible subjects will receive booster injections with VLA15 or placebo at Month 18, 30 and 42.

Eligibility Criteria:
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 history of or currently has a clinically relevant disease;
* Subject has a medical history of or currently has a neuro- inflammatory or autoimmune disease;
* Subject has a known thrombocytopenia, bleeding disorder, or received anticoagulants in the 3 weeks prior to Day 1;
* Subject has received an active or passive immunization within 4 weeks prior to Day 1;
* Subject has received any other registered or non-registered medicinal product in another clinical trial within 4 weeks prior to vaccination at Day 1;
* Subject has a known or suspected defect of the immune system or received immuno-suppressive therapy within 4 weeks prior to Day 1;
* Subject has a history of anaphylaxis of unknown cause or severe allergic reactions of unknown cause or has a known hypersensitivity or allergic reactions to one of the components of the vaccine;
* Subject had any malignancy in the past 5 years;
* Subject is pregnant, has plans to become pregnant during the course of the study or is lactating at the time of enrollment;
* Subject has donated or plans to donate blood or blood-derived products 4 weeks prior to Day 1;
* Subject has any condition that may compromise its well-being, might interfere with evaluation of study endpoints, or would limit the subject's ability to complete the study;
* Subject is in a dependent relationship with the sponsor/investigator