Vaccine safety experts say more research into the side effects would be welcome yet question whether the health secretary’s effort will be grounded in science.

As the outbreak grows to more than 700 confirmed cases, the largest in the country, some people remain opposed to vaccines and others are rushing to get the shots.

WASHINGTON—With the remaining days of August dwindling and autumn rapidly approaching, the nation ashamedly confirmed Wednesday that it had once again failed to make the most of summer. “We’re running...

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