Cook County Hospital has provided comprehensive primary, specialty and tertiary health care services to the residents of Cook County since the 1800s. The hospital is nationally known for its knowledge and breadth of services, including its Level 1 Trauma Center, Burn Unit, and Neonatal Intensive Care Unit, the largest in the Midwest. Its centers include asthma, cancer, maternal and infant health and infectious diseases. Cook County Hospital features a trauma unit, burn unit, neonatology/prenatal Center, adult and pediatric emergency rooms, ambulatory care clinics, emergency medicine and same day surgery. The hospital encompasses more than 155,000 adult and pediatric emergency room visits, 4,5000 trauma admissions and nearly 13,000 surgical procedures in a year. Cook County Hospital opened the world s first blood bank in 1937, the first Cobalt-beam Therapy Unit in 1953, the first Trauma Unit in the United States in 1966, and the first AIDS/HIV clinic in Chicago in 1983. Cook County Hospital employs nearly 5, 000 people and is located in Chicago.