Clinical Trial Finder

Inclusion Criteria:

• - Subject is aged 18 to 65 years at the day of screening (Visit 0) - Subject is of good general health, including subjects with pharmacologically controlled chronic conditions; - Subject has an understanding of the study and its procedures, agrees to its provisions,and gives written informed consent prior to any study-related procedures; - If subject is of childbearing potential: - Subject has a negative serum pregnancy test at screening (Visit 0); - Subject agrees to employ adequate birth control measures for the duration of the study.

Exclusion Criteria:

• - Subject has a chronic illness related to Lyme borreliosis (LB), an active symptomatic LB as suspected or diagnosed by a physician, or received treatment for LB within the last 3 months prior to Visit 0; - Subject received previous vaccination against LB.

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• - Subject had a tick bite within 4 weeks prior to Visit 1; - Subject has a medical history of or currently has a clinically relevant disease (e.g. cardiovascular, respiratory, neurologic, psychiatric conditions) which poses a risk for participation in the study, based on investigators judgement, such as individuals with poorly controlled or unstable disease, ongoing suspected or active inflammation, or poor compliance with pharmacologic treatment.

Subjects with pharmacologically controlled conditions like osteoarthritis, depression, or asthma are eligible;

• - Subject has a medical history of or currently has a neuroinflammatory or autoimmune disease, including Guillain Barré Syndrome; - Subject has a known thrombocytopenia, bleeding disorder, or received anticoagulants in the three weeks prior to each study vaccination, contraindicating I.

M. vaccination as judged by the investigator;

• - Subject has received an active or passive immunization within 28 days before or after any vaccination; except for influenza (seasonal or pandemic) vaccines which may be administered outside a 7-days interval before or after any trial vaccination; - Subject has received any other non-registered medicinal product in another clinical Trial within 28 days prior to VLA15 vaccination at Visit 1 (Day 1) and throughout the entire study period or has received a registered medicinal product in another clinical Trial within 28 days prior to VLA15 vaccination at Visit 1 (Day 1) and up to Day 208; - Subject has a known or suspected defect of the immune system that would prevent an immune response to the vaccine, such as subjects with congenital or acquired immunodeficiency, including infection with human immunodeficiency virus (HIV), Status post organ transplantation or immuno-suppressive therapy within 30 days prior to Visit 1.

Immuno-suppressive therapy is defined as administration of chronic (longer than 14 days) prednisone or equivalent 0.05 mg/kg/day. Topical and inhaled steroids are allowed;

• - Subject has a history of anaphylaxis or severe allergic reactions or a known hypersensitivity or allergic reactions to one of the components of the vaccine; Subject had any malignancy in the past 5 years.

If treatment for cancer was successfully completed more than 5 years ago and the malignancy is considered to be cured, the subject may be enrolled;

• - Subject had acute febrile infections within 10 days prior to first vaccination; - Subject is pregnant (positive serum pregnancy test at screening), has plans to become pregnant during the course of the study or is lactating at the time of enrollment.

Women of childbearing potential that are unwilling or unable to employ an adequate birth Control measure for the duration of the study.

• - Subject has donated blood or blood-derived products (e.g. plasma) within 30 days or received blood or blood-derived products (e.g. plasma) within 90 days prior to first vaccination in this study or plans to donate or use blood or blood products during the course of the study; - Subject has any condition that, in the opinion of the investigator, may compromise the subject's well-being, might interfere with evaluation of study endpoints, or would Limit the subject's ability to complete the study; - Subject is committed to an institution (by virtue of an order issued either by the judicial or the administrative authorities); - Subject is in a dependent relationship with the sponsor, an investigator or other study team member, or the study center.

Dependent relationships include close relatives and household members (i.e. children, partner/spouse, siblings, parents) as well as employees of the investigator or study center personnel.

This is a randomized, observer-blind (subject, Sponsor and investigator/site staff involved in Clinical Evaluation of subjects are blinded), Placebo controlled, multicenter Phase 2 study. A total of 250 healthy subjects,aged 18 to 65 years, will be randomized 2:2:1 to receive either VLA15 with Alum (two different dose levels) or Placebo. Vaccinations will be administered as intramuscular injections on Day 1 (Month 0), Day 57 (Month 2) and Day 180 (Month 6).

Arms

Experimental: VLA15 Dose 1

VLA15 with Alum lower selected Dose

Experimental: VLA15 Dose 2

VLA15 with Alum higher selected Dose

Placebo Comparator: Placebo

Interventions

Biological: - VLA15

a multivalent recombinant Outer Surface Protein A (OspA) based vaccine candidate

Biological: - Placebo

PBS (Phosphate Buffered Saline)