I had an adult booster for pertussis/tetanus before the birth of...

I had an adult booster for pertussis/tetanus before the birth of my daughter due to the outbreaks of whooping cough.

As for your comment "Surely if your child is vaccinated, it is at no danger of being infected by the very low minority of those who don't have immunity.", there have been outbreaks of whooping cough here and measles in the U.S. So my children are at risk from those who choose not to vaccinate and your statement is factually incorrect.