adenovirus vector Animals 2 Disease Models, Animal 2 SARS-CoV-2 2 animal 2 disease model 2 genetics 2 Ad5-S-nb2 vaccine 1 Antibodies, Neutralizing 1 Antibodies, Viral 1 Antibody 1 Article 1 BCG vaccine 1 Behavior, Animal 1 CD4+ T lymphocyte 1 CD8+ T lymphocyte 1 COVID-19 1 COVID-19 Vaccines 1 ChAdOx1 nCoV-19 vaccine 1 Clinical Trials as Topic 1 Conditioning, Classical 1 Contextual fear conditioning 1 CoroVaxG.3 vaccine 1 Fear 1 GRAd-COV2 vaccine 1 Gene Knockdown Techniques 1 Genetic Vectors 1 Hippocampus 1 Homer Scaffolding Proteins 1 Homer1c 1