ALBANY, N.Y. (AP) — A county in New York City's northern suburbs declared a state of emergency Tuesday over a measles outbreak that has infected more than 150 people since last fall, hoping a ban against unvaccinated children in public places wakes their parents to the seriousness of the problem.

"It's an attention grab, there's no question about it," Rockland County Executive Ed Day said at a news conference, noting that he didn't believe such a drastic step has ever been tried in the U.S. before.

Day said he was taking the action in hopes of reversing a recent uptick in cases amid disturbing...