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The authors very recently described a method to engineer exosomes in vivo with the E7 protein of Human Papilloma Virus (HPV). This technique consists in the intramuscular injection of a DNA vector expressing HPV\u2010E7 fused at the C\u2010terminus of an exosome\u2010anchoring protein, that is, Nef<jats:sup>mut<\/jats:sup>, the authors previously characterized for its high levels of incorporation in exosomes. In this configuration, the \u224811\u2009kDa E7 protein elicited a both strong and effective antigen\u2010specific cytotoxic T lymphocyte (CTL) immunity. Attempting to establish whether this method could have general applicability, the authors expanded the immunogenicity studies toward an array of viral products of various origin and size including Ebola Virus VP24, VP40 and NP, Influenza Virus NP, Crimean\u2013Congo Hemorrhagic Fever NP, West Nile Virus NS3, and Hepatitis C Virus NS3. All antigens appeared stable upon fusion with Nef<jats:sup>mut<\/jats:sup>, and are uploaded in exosomes at levels comparable to Nef<jats:sup>mut<\/jats:sup>. When injected in mice, DNA vectors expressing the diverse fusion products elicited a well detectable antigen\u2010specific CD8<jats:sup>+<\/jats:sup> T cell response associating with a cytotoxic activity potent enough to kill peptide\u2010loaded and\/or antigen\u2010expressing syngeneic cells. 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