In this Jan. 30, 2019, file photo, a sign warning patients and visitors of a measles outbreak is shown posted at The Vancouver Clinic in Vancouver, Wash. (AP Photo/Gillian Flaccus, File) **FILE**
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In this Jan. 30, 2019, file photo, a sign warning patients and visitors of a measles outbreak is shown posted at The Vancouver Clinic in Vancouver, Wash. (AP Photo/Gillian Flaccus, File) **FILE**
