Meanings of antigenic shift in inglés

It is unlikely a vaccine will be achieved because of what we call antigenic drift and antigenic shift.

Recently, incidence has risen in countries with strong vaccine programmes and there are concerns about antigenic shift resulting in vaccine evasion.

Due to continuous antigenic drift and occasional antigenic shift, influenza viruses escape from human adaptive immunity resulting in significant morbidity and mortality in humans.

- There are two different ways: antigenic drift, which happens all the time, and antigenic shift, which only happens occasionally.