In this Jan. 25, 2019 file photo, a sign prohibiting all children under 12 and unvaccinated adults stands at the entrance to PeaceHealth Southwest Medical Center in Vancouver, Wash. A measles outbreak near Portland has sickened dozens of people in Oregon and Washington, with several more cases suspected, and public health officials scrambling to contain the virus say low vaccination rates are making the situation worse. Clark County Public Health said Sunday, Jan. 28, 2019, that the majority of the cases involve children younger than 10. (AP Photo/Gillian Flaccus, File)