DETAILED DESCRIPTION What is claimed is: 1.
An adjuvant composition comprising a QS21 and an immunostimulatory oligonucleotide containing an unmethylated CG dinucleotide.
2.
An adjuvant composition according to claim 1 further comprising a carrier.
3.
An adjuvant composition as claimed in claim 1, wherein said immunostimulatory oligonucleotide comprises a Purine, Purine, C, G, pyrimidine, pyrimidine sequence.
4.
An adjuvant composition as claimed in claim 1, wherein said immunostimulatory oligonucleotide is selected from the group comprising: TCC ATG ACG TTC CTG ACG TT (SEQ ID NO:1); TCT CCC AGC GTG CGC CAT (SEQ ID NO:2); ACC GAT GAC GTC GCC GGT GAC GGC ACC ACG (SEQ ID NO:3); TCG TCG TTT TGT CGT TTT GTC GTT (SEQ ID NO:4); TCC ATG ACG TTC CTG ATG CT (SEQ ID NO:5).
5.
An adjuvant composition as claimed in claim 1, wherein the immunostimulatory oligonucleotide contains at least two unmethylated CG repeats being separated at least by 3 nucleotides.
6.
An adjuvant composition according to claim 5, wherein the immunostimulatory oligonucleotide contains at least two unmethylated CG repeats being separated by 6 nucleotides.
7.
An adjuvant composition as claimed in claim 2, wherein said carrier is a particulate carrier selected from the group comprising metallic salt particles, emulsions, polymers, liposomes, ISCOMs.
8.
An immunogenic composition comprising an adjuvant composition as claimed in claims 1 or 2, further comprising an antigen.
9.
An immunogenic composition as claimed in claim 8, wherein said antigen is derived from an organism selected from the group comprising: Human Immunodeficiency Virus, Varicella Zoster virus, Herpes Simplex Virus type 1, Herpes Simplex virus type 2, Human cytomegalovirus, Dengue virus, Hepatitis A, B, C or E, Respiratory Syncytial virus, human papilloma virus, Influenza virus, Hib, Meningitis virus, Salmonella, Neisseria, Borrelia, Chlamydia, Bordetella, Streptococcus, Mycoplasma, Mycobacteria, Haemophilus, Plasmodium or Toxoplasma, stanworth decapeptide; or the N terminal 39-43 amino acid fragment (Abeta) of the amyloid precursor protein or antigens associated with atheroschlerosis
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Drugs 
