I think your missing the point here It's not a matter of them being legit or not it's when you ask them to not call and they keep calling and I don't see this number as legit here for they are saying now that they are national opinion from http://nationalopinionnetwork.com/ so you be the jugde if it's legit or not now
It is a legitimate CDC number. Verified before I answered. It is a survey about child vaccinations. I went ahead and answered the survey as I think it is important. I did not get asked questions I did not want to answer. Did not ask for my name or address. They did ask about number of kids and vaccination records, race, income and date of births. No names asked for any of my family members.