Because the delta mutation increased viral.loads and contagion.
One more mutation for lethality and we are toast.
Watch the news *then*.
Delta plus has already been shown to not respond to MAB infusions.
We are losing ground. And antivaxxers are to blame.
Not to be confrontational but there is a good bit of evidence beginning to surface that the vaccines may be the causing the mutations to become “enhanced”. If left to themselves and mother nature, RNA viruses generally become MORE transmissible but LESS lethal. IF..this Sars-CoV-2 behaves Differently it will be the FIRST of the Corona-class viruses in history to do so and IF... that happens, we’d have to ask WHY? Just like bacteria, viruses adapt to survive, hence why there are so many drug-resistant bacteria emerging.