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The United States recorded 16 new measles cases between July 18 and July 25, federal health officials said on Monday, as the spread of the disease, which has infected 1,164 people this year in the worst U.S. outbreak since 1992, shows signs of slowing.

The U.S. Centers for Disease Control and Prevention said the new cases represented a 1.4 per cent increase in the number of cases of the highly contagious and sometimes deadly disease since the previous week.

In recent weeks, the CDC has reported smaller increases in the number of measles cases, compared with a surge of more than a hundred cases reported in a single week earlier this year.

The running tally of cases this year, which have popped up in 30 states, includes active cases and those that have since resolved. No fatalities have been reported.

Health experts say the virus has spread mostly among school-age children whose parents declined to give them the measles-mumps-rubella, or MMR, vaccine, which confers immunity to the disease. A vocal fringe of U.S. parents cites concerns that the vaccine may cause autism despite scientific studies that have debunked such claims.

Measles was declared eliminated in the United States in 2000, meaning there was no continuous transmission of the disease for a year. Still, cases of the virus occur and spread via travelers coming from countries where measles is common.

CDC officials have warned that the country risks losing its measles elimination status if the ongoing outbreak, which began in October 2018 in New York, continues until October 2019.

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