U.S. Department of Health & Human Services

The Department of Health and Human Services is the United States government's principal agency for protecting the health of all Americans and providing essential human services, especially for those who are least able to help themselves. The department includes more than 300 programs, covering a wide spectrum of activities, including medical and social science research, preventing outbreak of infectious disease, including immunization services, assuring food and drug safety, welfare, and Medicare and Medicaid.