@Cornettoninja
What does the antigenic bit translate to in dumbese?
Basically, that the new variant could be different enough from "original coronavirus" so that a person's immune does not recognise it, even if they've been previously infected by "original coronavirus" so they have no enhanced immune response to it - the body might just see it as a totally new infection and respond to it as such.
And a vaccine developed for specific antigenic parts of "original coronavirus" might not work against the new variant if those specific antigenic parts are significantly distorted or missing altogether.
Seems they don't have a large enough dataset yet to unequivocally say what it means, but seeing as there have been very few reinfections that I've seen reported in the past 9 months (Worldwide 25 confirmed, 421 suspected from 75 Million cases), these 4 in 1000 cases I imagine are causing the scientists great concern.