CHICAGO (AP) — Chicago Police Superintendent Eddie Johnson is back at work after undergoing a kidney transplant seven weeks ago.

Johnson returned to work on Wednesday and department spokesman Anthony Guglielmi says he has been cleared by his doctors to work full time.

Guglielmi says doctors put no restrictions on Johnson and that the superintendent is already exercising regularly.

Johnson had battled potentially life-threatening inflammation of the kidneys for decades and was on a waiting list for a new kidney when in August he received a kidney from his 25-year-old son, Daniel Johnson.

Doctors have said the chances are slim that Johnson's body will reject the kidney, particularly because it came from his son.