Earlier quoted context omitted.
I'm not sure about that. There are probably hundreds or thousands of still-viable mutations it might come up with at random, and we don't want to inject dozens of vaccine candidates to deal with them. Or maybe we do? A lot of adults have probably had a dozen or two dozen varying flu shots.
It's not like the virus waits until we start hitting it with a vaccine, and then mutates in response. There's a certain amount of variation in the population. More fit genes are more common. If there's other variations of this portion of the spike protein out there, they're almost certainly less fit than the overwhelmingly predominant type. Maybe if the predominant type is severely attenuated by vaccine these will ge…
But, if any (survivable) variations do exist, their survival advantage would grow tremendously once this antibody saw widespread use in treatments, which would lead to the variations likely becoming dominant quite rapidly thereafter.
Still, there's no reason not to keep searching and studying. We may be able to make an effective treatment based on this.