Abstract
Circulating antibody titers can be increased when the antigen is administered in an aqueous medium with N-acetylmuramyl-L-alanyl-D-isoglutamine (muramyl dipeptide). Results reported here show that cell-mediated immunity can be demonstrated when this synthetic adjuvant or an active analog is injected with an antigen (ovalbumin) in metabolizable squalane emulsion. Under these conditions a lipophilic derivative of muramyl dipeptide was shown to be even more active and to enhance long-lasting immune responses.

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