Centers of Disease Control

The Centers of Disease Control, abbreviated as the CDC, was an American organization based in Atlanta, Georgia.

The Eighth Doctor posed as a member of the CDC who came to Nevada to investigate the Von Neumann seeding probe. (PROSE: Spore)

Parker Theroux mentioned the CDC and the Pentagon as organisations who should be contacted to deal with the Living Ice. (PROSE: Drift)

Behind the scenes
The real-world organisation is actually the Centers for Disease Control and Prevention.