Abstract Vaccines against SARS-CoV-2 are urgently required, but early development of vaccines SARS-CoV-1 resulted in enhanced disease after vaccination. Careful assessment this phenomena is warranted for vaccine SARS CoV-2. Here we report detailed immune profiling ChAdOx1 nCoV-19 (AZD1222) and subsequent high dose challenge two animal models mediated disease. We demonstrate rhesus macaques the ...