** FILE ** In this April 22, 2012, file photo, Holly Ann Haley, 4, gets vaccinations at the doctor's office in Berlin, Vt., although the state continues to be embroiled in a debate about continuing to allowing parents to have their children skip the immunizations required for most to attend school. (Associated Press)

** FILE ** In this April 22, 2012, file photo, Holly Ann Haley, 4, gets vaccinations at the doctor's office in Berlin, Vt., although the state continues to be embroiled in a debate about continuing to allowing parents to have their children skip the immunizations required for most to attend school. (Associated Press)