Anyone with COVID antibodies - due to vaccination or previous exposure to the virus - is at increased risk due to antibody-dependent enhancement:
"Data from the study of SARS-CoV and other respiratory viruses suggest that anti-SARS-CoV-2 antibodies could exacerbate COVID-19 through antibody-dependent enhancement (ADE)."
https://www.nature.com/articles/s41564-020-00789-5