NPR's Maria Godoy reports on Pennsylvania's quiet word-of-mouth campaign to vaccinate Amish families during the country's worst measles outbreak in 35 years, which has brought six deaths and more than 1,500 cases in the state, over 500 of them in Lancaster County. Nurse Dale Weiser has given more than 400 MMR doses in Amish homes, and health officials say the patient, personal approach is building trust even as the false rumor that the vaccine contains aborted fetal parts keeps some families hesitant.