The Centers for Disease Control and Prevention (CDC) is an agency of the U.S. Department of Health and Human Services. The CDC works with state and local health officials and the public to achieve better health for all people. The CDC creates the expertise, information, and tools that people and communities need to protect their health—by promoting health, preventing disease, injury, and disability, and being prepared for new health threats.

The Genetics Home Reference provides information on hundreds of genetic conditions. The website has many tools for learning about human genetics and the way genetic changes can cause disease. It also has links to additional resources for people who have genetic conditions and for their families.

The National Institute of Allergy and Infectious Diseases conducts research and provides consumer information on infectious and immune-system-related diseases.

The USDA Food Safety and Inspection Service sees that the supply of meat, poultry, and egg products in the United States is safe, wholesome, and correctly labeled and packaged. Its Web site has extensive information on food safety, food preparation, food poisoning, and food labeling. It provides phone numbers and e-mail addresses to use to ask for information on food poisoning, food safety, and food safety education programs. The Web site also allows the public to ask questions through an interactive feature called "Ask Karen."