The Centers for Disease Control and Prevention (or CDC) is an agency of the US Department of Health and Human Services based in Atlanta, Georgia. Recognized as the leading United States government agency for protecting the public health and safety of people, the CDC provides credible information to enhance health decisions and promotes health through strong partnerships with state health departments and other organizations. The CDC focuses national attention on developing and applying disease prevention and control (especially infectious diseases), environmental health, health promotion and education activities designed to improve the health of the people of the United States.
Dr. Hellura Lyle worked for the CDC. She was called in as part of an investigation concerning a biological organism in the Boston subway system along with Dana Scully and John Doggett in 2001. (TXF: "Medusa")