The vector to the baby is likely one of the adults the baby comes in contact with. The whooping cough vaccine only lasts a few years and adults were not being vaccinated with it. It's now on the schedule but only when you get a tetanus shot and how many people are up to date with that?
“It’s now on the schedule but only when you get a tetanus shot and how many people are up to date with that?”
My entire family is because we have young children in our family.