The immune response induced following administration of the anti-COVID-19 vaccine is not only humoral (with the production of neutralizing antibodies directed against the S protein of the viral capsid), but also cellular (with the activation and proliferation of various lymphocyte populations, in particular CD 8 + cytotoxic T lymphocytes, capable of rapidly detecting and eliminating infected cells) [7,8,9]. Here, PROS1 is linked to COVID-19.