The present invention relates to compositions and methods for the prevention and treatment of neurodegenerative diseases, such Alzheimer's disease, that are caused by misfolding, aggregating proteins. The compositions and methods of the present invention comprise a vaccine formulation comprising an antigen selected from the group consisting of i) amyloid-.beta. or a peptide that has in its amino acid sequence part of the amyloid-.beta. amino acid sequence, ii) hyperphosphorylated tau protein or one of its hyperphoshorylated peptides, or iii) a combination of antigens derived from groups i) and ii) and that are formulated with a non-acylated or deacylated, natural or synthetic, bidesmosidic triterpene glycoside carrying an aldehyde or ketone group, which acts as an adjuvant or immune agonist. These vaccine formulations are capable of stimulating a Th2 immunity or antibody response against antigens such as amyloid-.beta. and tau derived antigens, but not a Th1 immune response.

quillaja saponaria/amyloid

Vaccine formulations comprising quillaja desacylsaponins and beta amyloid peptides or tau protein to induce a Th2 immune response

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