We all have every vaccine you can get. It’s possible I’m misremembering exactly what disease it was, but I promise you that a single instance of our kid in a ball pit ruined a vacation for two families.
Ballpits encourage contact with eyes, mouth, and nose, then spread it all around over the balls. They are especially difficult to clean. It would be difficult to design a better disease transmission vector if you were trying.
ignorance is bliss