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SARS-CoV-2 nucleocapsid (N) protein has been proposed as a good vaccine target. N-specific T cells were observed in SARS-CoV-2 N immunized mice and COVID-19 convalescents. It is of importance to identify the T cell responses triggered by SARS-CoV-2 N protein. Intradermal immunization with SARS-CoV N protein was demonstrated to elicit non-protective T cell responses which may be avoided by intranasal vaccination. Therefore, we conducted intranasal vaccination of BALB/c mice with recombinant adenovirus type-5 expressing SARS-CoV-2 N protein. Such procedure induced CD8 T cell responses in the lung. Meanwhile CD4 T cell responses were observed in the spleen, which was associated with robust antibody production. Our study further supports the notion that SARS-CoV-2 N protein can work as a target for vaccine development.
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SARS-CoV-2 nucleocapsid protein intranasal inoculation induces local and systemic T cell responses in mice
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