The number of measles cases in the U.S. this year is nearing a 30 year high.

That number has quadrupled compared to 2023. As of Friday, according to the CDC, there have been 1,168 confirmed cases across 33 states nationwide. Most cases are in unvaccinated people.

There are also new challenges to addressing the spread of measles: according to a Johns Hopkins University study published this week , rates of childhood vaccination against measles fell broadly across the U.S. in the wake of the COVID-19 pandemic.

Childhood vaccination for measles dropped in close to 80% of counties, according to available data for more than 2,000 counties nationwide. The decline includes states that are actively battling outbreaks of the disease.

Domestic and international travel both contribute to the spr

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