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We recently demonstrated that vaccinated rhesus macaques controlled viral replication of a heterologous SIV challenge. Here, we analyzed anamnestic SIV-specific CD4+ T-cell responses expanding immediately after challenge and show that successful vaccinees consistently targeted a short region of the Gag-p27 Capsid (amino acids 249-291). We have also defined the major histocompatibility complex class II (MHC-II) restricting alleles for several of these responses and show that DQ-restricted CD4+ T-cells depend on unique combinations of both the DQA and DQB alleles. Analysis of SIV-specific CD4+ T-cell responses elicited by a successful vaccine may have important implications in the understanding of vaccine design.

Simian immunodeficiency virus-specific CD4+ T cells from successful vaccinees target the SIV Gag capsid