I don't think my answer will help you much, lol
I only mention it to Drs/Nurses who are treating my child anyway as it is only actually important to them.

For everyone else it is basically a case of it was the decision I made and I keep her away from people who are sick so she can't catch anything from them.

Ugh on the comments though. Sheesh. The propaganda being spread is unbelievably damaging. I can imagine how uncomfortable you must have been feeling. Just remind them that you have to be more careful of whooping cough than they do. Unvaccinated babies don't spread it. They get the sickest from it. You have to be more careful than they do because you are not counting on the vaccination. Might open their eyes just that little bit.