1 point for the episode/main plot.
1 point for the joke/scene.
Guess goes in, points come out.
Guess goes in, points come out.
1 point for the episode/main plot.
1 point for the joke/scene.
Guess goes in, points come out.
Guess goes in, points come out.
It looks like the widely available/popular MMR vaccine was widespread by the late 70s, and given Lisa’s age she would have been born in the early 80s.
So she likely would have gotten it.
However I suspect the writers for the show just reflected on their own childhood when people getting mumps was a thing.