The invention provides uses for phospholipid conjugates of TLR agonists as enhancers of an innate immune response. Specifically, purine derivatives which are conjugated to a phospholipid or an analog thereof are disclosed as having activity as TLR7 agonists, capable of inducing an innate immune response upon administration in an effective amount to a subject. The phospholipid moiety of the TLR7 agonist contains one or more alkyl ether or ester moieties.
