The United States’ worst measles outbreak in a quarter-century spread to Idaho and Virginia last week.

Public health authorities on Monday reported 41 new cases of the highly contagious and sometimes deadly disease, Reuters reports.

The U.S. has recorded 1,022 cases of the diseases this year as of June 6, in an outbreak blamed on misinformation about vaccines.

The 2019 outbreak, which has reached 28 states, is the worst since 1992, when 2,126 cases were recorded, the Centers for Disease Control and Prevention said.

Federal health officials attribute this year’s outbreak to U.S. parents who refuse to vaccinate their children.

These parents believe, contrary to scientific evidence, that ingredients in the vaccine can cause autism.

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