A Phase II clinical research study to evaluate the efficacy and safety of two different dose levels of an injectable investigational treatment (ACC-001) in subjects with Mild-to-Moderate Alzheimer's disease. ACC-001 (vanutide cridificar) is a beta amyloid fragment attached to a carrier protein. It is intended to help induce an antibody response against beta amyloid and is administered as an intramuscular injection.

Inclusion Criteria:

• Diagnosis of probable AD
• Age from 50 to 89
• Mini-Mental Status Exam score of 18-26 inclusive
• Brain magnetic resonance imaging (MRI) scan consistent with the diagnosis of AD
• Stable doses of medications (cholinesterase inhibitors and memantine allowed)
• Caregiver able to attend all clinic visits with patient
• Amyloid burden on screening PET scan consistent with diagnosis of AD

Exclusion Criteria:

• Significant neurological disease other than AD
• Major psychiatric disorder
• Significant systemic illness
• History of stroke, seizure or autoimmune disease
• History of myocardial infarction within the last 2 years
• Smoking greater than 20 cigarettes per day
• Anticonvulsants, anti-Parkinson's, anticoagulant, or narcotic medications (anticonvulsants used for non-seizure reasons are allowed)
• Prior treatment experimental immunotherapeutics or vaccines for AD
• Women of childbearing potential
• Presence of pacemakers, CSF shunts, or foreign metal objects in the eyes, skin or body