Amid Cyclosporiasis Outbreak, Measles Cases Are Nearing Last Year's Total
The CDC reports that U.S. measles cases have reached 2,231, nearly surpassing the total for all of 2025, with most cases occurring in unvaccinated individuals. Simultaneously, a nationwide outbreak of the parasitic illness cyclosporiasis is affecting 31 states.
Why it matters
The resurgence of vaccine-preventable diseases and the spread of foodborne parasites represent significant public health challenges in the United States.
Topline As an outbreak of the diarrhea-inducing illness cyclosporiasis grows this month, the spread of measles in the U.S. this year is outpacing the case count for the entirety of 2025, according to the Centers for Disease Control and Prevention, which reported this week that cases of the highly contagious disease has reached 2,231.
The measles virus, paramyxoviridae from the Morbillivirus family, transmission microscopy view. Photo by: BSIP/Universal Images Group via Getty Images Key Facts The 2,231 cases were confirmed as of July 9, according to CDC data , meaning the U.S. is just 58 cases away from logging the 2025 total.
Similar to last year, children ages five to 19 are most affected by the illness, with 1,122 cases.
The CDC has found 93% of this year’s cases are linked to people who are unvaccinated or whose vaccination status is unknown.
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