TLR agonists as adjuvants for viral vaccines: mechanisms, applications, and future directions

Published: 04/07/2026

Toll-like receptors (TLRs) play a pivotal role in the innate immune system by recognizing pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs), thereby initiating immune responses against viral infections.

Sirard Jean-Claude & al

TLR agonists have emerged as promising adjuvants to enhance the efficacy of viral vaccines by modulating immune responses, improving antigen presentation, and promoting both humoral and cellular immunity. This review comprehensively summarizes the classification, signaling mechanisms, and immunomodulatory functions of cell-surface and intracellular TLRs.

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