Since one of the signs of severe COVID-19 is systemic coagulopathy and prothrombotic status, it was considered plausible to investigate the allelic state of the fibrinogen beta (FGB) gene (rs1800790), which, according to a number of studies, is associated with high levels of fibrinogen and D-dimers, as well as a worse prognosis for COVID-19 and high mortality [4,5]. Here, FGB is linked to COVID-19.