The CCP antibody test helps to diagnose RA and can be useful in identifying people with a more rapidly erosive form of the disease. RA is a chronic, systemic autoimmune disease that causes inflammation, pain, stiffness, and destructive changes in the hands, feet, and other joints throughout the body.
As you can see from the map above, most of the Illinois population is based in the North East of the state. Chicago, home to 2,695,598 people, remains the largest city in Illinois. It dwarfs the state's other cities â the next largest is Aurora, with 197,899 people.
Cook County is a county in the U.S. state of Illinois. It is the second-most populous county in the United States after Los Angeles County, California. As of 2015, the population was 5,238,216.[5] Its county seat is Chicago, the largest city in Illinois and third-most populous city in the United States.