The CDC is a comprehensive source of information on public health issues, including immunization, sanitation, and infectious disease. The CDC provides a large library of information to the public on many topics. Some of the categories include: Diseases and Conditions; Emergency Preparedness & Response; Environmental Health; Life Stages & Populations; Healthy Living, Injury, Violence & Safety; Traveler's Health; Workplace Safety & Health. The CDC website includes a powerful search engine as well as alphabetical listings. Users will find fact sheets, videos, photos, posters, and other useful materials to download.