I never received a letter from the CDC, but did make the mistake once of answering on my cell phone, even though I did not recognize the number. It is obvious to me that they are insane, as after you refuse to answer any questions and hang up, they continue to call. I get a call every day, seven days a week, at approx. 7 to 8 PM. This has been going on for weeks. Computer generated or not... legitimate or not, they should respect your request. To continue calling someone who has made it abundantly clear that he is not interested and will not cooperate is irrational. How do you expect to get cooperation and information from someone you've angered?
They can call until the cows come home. It will avail them nothing.
I know they are lying about at least one thing. They claim that "you were selected by the CDC...". This is false. They are calling me on my company cell phone; it is NOT registered in my name.
Received several calls on my cell phone over the last week - none at inappropriate hours. At first I just hung up after the lady said she was calling on behalf of the CDC conducting a survey. Then I just ignored the calls and there was never a voice mail message. Finally, I answered, let her speak a little bit and simply stated that she was calling my cellphone and that I don't want the number used for this purpose and asked to be removed from the calling list. She politely acknowledged my request and said have a nice day. I have not received any calls since.
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I "googled" the number and discovered that it is the National Opinion Research Center at the University of Chicago. They are conducting research surveys and it appears that they have been doing various research studies for some time. You can find contact information on the site. You can also read about what they are researching and why.
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I don't know if they are ligit or not. To me it's irrelevant because I simply do not wish to participate in any research studies from organizations that I am not familiar with. I will not take the chance with my personal information. You cannot be too careful these days.