Health care is the largest industry in the United States, employing more than 18 million people and growing rapidly, according to the Centers for Disease Control. Health care workers diagnose, treat, and administer care to patients 24 hours a day, 7 days a week.

The health care system is comprised of a wide variety of medical facilities that are located throughout the country. Hospitals provide comprehensive medical care to patients. Services include emergency care, diagnostic medicine, surgery, and general care. Nursing and residential facilities provide medical services to people who need continuous care, but do not need to be hospitalized.

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