How worried should we be about the new AY.4.2 lineage of coronavirus?
No sooner than you thought all the talk of new COVID-19 variants was over, there’s news of yet another one: AY.4.2. But what is it, where did it come from, and should we be concerned?
AY.4.2 is what’s termed a “lineage”. These are labels given to branches of the COVID-19 evolutionary tree to illustrate their relatedness.
