Similar to other reports, we also examined BCR repertoires in the peripheral blood of two HDs who had been infected with COVID-19 and had recovered at least six months prior (HD-COVID-19), two HDs who had been treated with an mRNA vaccine (mRNA-1273 or BNT162b2) at least two months prior (HDs with vaccine), and three HDs who had not received the vaccine (HDs without vaccine). This evidence concerns the gene BCR and COVID-19.