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.Cette invention concerne les utilisations des conjugués phospholipidiques d'agonistes de TLR pour améliorer une réponse immunitaire innée.