a_minimalist;4953428 said:
If it constantly adapts, which I was well aware of, why even take the shot?
I wasn't trying to imply that you didn't have a clue, it was just the most concise way I could reply it the post. I apologize if that came off wrong. Our back and forth has been a good discussion and I didn't meant to imply anything by it, just point out to Cajun I had addressed that question.
But, to answer you next question.
Because like most mutations, it usually takes a conglomerate of single genetic changes to produce an observable change. A single change in the genetic sequence might not do anything or it could do something. I don't think the idea is that the virus instantly changes from person-to-person. The actual genetic code of the virus may change but the resultant changes in the organism itself could be nothing. Just given enough replication and time within the population, the odds of a new strain arising are increased.
You take the shot because they can predict to a certain extent what strains will be present. I don't know how they do it. I know they collect data from around the world all throughout the year but that's about it.
When you guess right, you protect against that strain.
I don't think the process of change is so fast that it makes the shot irrelevant. Most shots are given prior to peak flu season based on the predicted strains thereby reducing spread from the onset and duration of the "flu season" itself.