Technically speaking ... the genetic code of the B cell receptor gene of B cells is altered by vaccines. The same goes for pretty much all antigens the body com

Technically speaking ... the genetic code of the B cell receptor gene of B cells is altered by vaccines. The same goes for pretty much all antigens the body comes across. But that's the point of the adaptive immune system and is obviously not what OP meant. https://en.wikipedia.org/wiki/V(D)J_recombination https://en.wikipedia.org/wiki/V(D)J_recombination