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NEW YORK — The United States recorded 25 new measles cases last week, raising the total number of cases this year to 1,148 in the country’s worst outbreak in a quarter century, federal health officials said on Monday.

The 2.2% increase in the number of cases between July 11 and July 18 included new cases in Ohio and Alaska, bringing the total number of states affected by the outbreak to 30, the U.S. Centers for Disease Control and Prevention (CDC) said.

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The latest report marked the first time since June 10 that the highly contagious and sometimes deadly disease had spread to additional states.

Still, health experts have been encouraged that the numbers of new weekly cases have dipped after a surge of more than a hundred cases in a single week earlier this year.

While 25 new cases is up from 14 in each of the past two weeks, the number reported in a week has not exceeded 30 since June 24.