FILE - In this Jan. 16, 1957 file photo, Jon Douglas, 6, right, visits his friend, Greg Cox, standing behind a sign warning he has mumps, on the door of his home in Altamont, Ill. Fifty years ago, mumps was once a childhood rite of passage of puffy cheeks and swollen jaws. That all changed with the arrival of a vaccine in the late 1960s, and mumps nearly disappeared. But in 2017, the U.S. is in the midst of one of the largest surges in decades. (AP Photo)