This is a phase I study to assess the tolerability and safety of 4 injections of two different doses of AFFITOPE® PD01A formulated with an adjuvant to patients with early Parkinson's disease in male and female patients aged 45 to 65 years (or age between 40 and 45 years if there is no evidence for genetic forms of the disease and the diagnosis of idiopathic Parkinson's disease was confirmed, after approval by Sponsor). One study site in Vienna (Austria) will be involved. Each patient's participation will last 1 year.