Adeno-associated viruses (AAVs) are non-pathogenic, replication-deficient viruses that have gained widespread attention for their application as gene therapy vectors. While these vectors offer high transduction efficiency and long-term gene expression, the host immune response poses a significant challenge to their clinical success. This review focuses on the obstacles to evaluating the humoral response to AAVs. We discuss the problems with the validation of in vitro tests and the possible approaches to overcome them. Using published data on neutralizing titers of AAV serotypes, we built the first antigenic maps of AAVs in order to visualize the antigenic relationships between varying serotypes.
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