Study Assessing Tolerability and Safety of AFFITOPE® PD03A in Patients With Early Parkinson's Disease

Inclusion Criteria: * Individuals with IPS diagnosed for less than 4 years and who present in Hoehn \& Yahr Stages I/II and fulfill the United Kingdom Parkinson's Disease Society Brain Bank Criteria * The result of a DAT-SPECT and MRI examination of the patient's brain has to be consistent with the diagnosis of PD * Written Informed Consent Form signed and dated by the patient * Age between 45 and 70 * Female patients of childbearing potential are eligible if they use a medically accepted contraceptive method * A potential participant treated with conventional PD therapies must be on stable doses for at least 3 months prior to Visit 0 and during the entire trial period and must be a stable responder * Accepted PD medications include the following: levodopa (alone or in combination with benserazide, carbidopa), Catechol-O-methyltransferase inhibitors (entacapone, tolcapone), amantadine, non-ergot dopamine agonists (pramipexol, ropinirol, rotigotine), monoamine oxidase-B inhibitors (rasagiline, selegiline) and anticholinergic medication * A potential participant has to be on stable doses of all medications he/she is taking because of consisting illnesses according to medical history (except PD therapies, these will be recorded separately) for at least 30 days prior to Visit 0, if considered relevant by the PI * Upon PI's opinion, no visual or auditory impairments that would reduce the patients' ability to complete study questionnaires or be unable to receive instructions for these Exclusion Criteria: * Pregnant women * Sexually active women of childbearing potential who are not using a medically accepted birth control method throughout the study * Participation in another clinical trial within 3 months before Visit 0 * History of questionable compliance to visit schedule; patients not expected to complete the clinical trial * Presence or history of allergy to components of the vaccine, if considered relevant by the PI * Contraindication for MRI imaging such as metallic endoprosthesis or stent implantation in the last 6 months or allergy to MRI contrast agent * Contraindication for DAT-SPECT * Contraindication for lumbar puncture such as anticoagulation * Dementia * History and/or presence of autoimmune disease, if considered relevant by the PI * Recent (≤3 years since last specific treatment) history of cancer (Exceptions: basal cell carcinoma, intraepithelial cervical neoplasia) * Active infectious disease (e.g., Hepatitis B, C) * Presence and/or history of Immunodeficiency (e.g., HIV) * Significant systemic illness (e.g., chronic renal failure, chronic liver disease, poorly controlled diabetes, poorly controlled congestive heart failure, other deficiencies), if considered relevant by the PI * History of significant psychiatric illness such as schizophrenia, bipolar affective disorder or psychotic depression * Parkinson-like disease secondary to drug therapy side effects (e.g., due to exposure to medications that deplete dopamine \[reserpine, tetrabenazine\] or block dopamine receptors \[neuroleptics, antiemetics\] * Parkinson-plus syndromes (e.g. MSA, PSP) * Heredodegenerative disorders * Alcoholism or substance abuse within the past year (alcohol or drug intoxication) * Prior and/or current treatment with experimental immunotherapeutics including intravenous immunoglobulin * Prior and/or current treatment with immunosuppressive drugs * Change in dose of standard treatments for PD within 3 months prior to Visit 0 * Change in dose of previous and current medications which the patient is taking because of consisting illnesses according medical history (except PD therapies, these will be recorded separately) within the last 30 days prior to Visit 0, if clinically relevant * Treatment with deep brain stimulation * Venous status rendering it impossible to place an i.v. access * L-Dopa related motor complications (response fluctuations and/or dyskinesia) * Evidence for genetic forms of PD: leucine-rich repeat kinase 2 and Parkin