The jab teaches the defense (immune system) how to defend against one offensive play: for example, a run up the middle. It then programs the entire immune system to defend against that one play.
If a different play is run by the offense, say a simple out route, the defense jams up the gaps in the middle, leaving the wide receiver open on the sideline --> touchdown.
So any play run other than the run up the middle is going to have success because that's the only play the defense knows how to defend against.
I had assumed successive jabs and boosters would be teaching the immune system to defend against other offensive plays, but I'm not sure if that's how it works.
That's what they THOUGHT.
In fact, the jabs only teach the defense to recognize when, say, uniform #32 is running up the middle.
If anyone else runs up the middle, they might not go for a touchdown, but they'll usually make it into the open field for awhile.
I had assumed successive jabs and boosters would be teaching the immune system to defend against other offensive plays, but I'm not sure if that's how it works.
The successive boosters might teach them to recognize when #99 is running up the middle, two. But then they forget two games later.