Within the past month new novel coronavirus variants have appeared in the UK, in South Africa, and in Brazil. These variants are more robust than the original virus, able to infect more easily and spread more rapidly. Possibly they are also more deadly, more virulent, data does hint at the possibility, but conclusive scientific data one way or the other has yet to emerge. Possibly they are also more resistant to the current vaccines and to the human immune system, though again conclusive scientific data one way or the other is not yet available.
These variants are gradually replacing the original coronavirus. It is estimated that in the United States that 1/3 of infections will be from the UK variant by mid-year, whereas right now its representation among infected individuals is miniscule. This is precisely what beneficial mutations do, outcompete and replace other variants.
In this society a USA variant is probably already here ... and there ... and over there. Besides, biologically, given this virus's proven proclivities, world-wide strains will be popping up for decades. This may end up being mixed into the annual vaccine schedules.
Not Invented Here has changed to Now Evolved Here as California leads the way with it's very own virulent variation. Plus one new symptom is you suddenly develop a craving for Orange Julius, Pinks Hot Dogs, Hamburger Haven and House of Pies.