Assertion: antigenic drift | /r/AtLocation | the antigen structures
Facets:
value: due to a point mutation
type: CAUSE
Source sentences:
text: The key difference between antigenic drift and antigenic shift is that antigenic drift is a genetic variation that occurs in the antigen structures due to a point mutation happens in the genes of the H and M within the viral genome over the year whereas antigenic shift is a variation occurs in the antigenic structures due to a sudden genetic reassortment between two or more closely related influenza viral strains.