The U.S. is experiencing its worst measles outbreak in over thirty years with 1,288 confirmed cases in 2025, exceeding the total from 2019. Outbreaks are linked to undervaccinated communities, primarily beginning in West Texas. Three deaths have been reported, raising public health concerns about potential continued spread. North America is also witnessing significant outbreaks, with thousands of cases in Mexico and Canada. Vaccination rates in certain communities, particularly conservative Mennonite populations, remain low despite the MMR vaccine's effectiveness at 97% after two doses.
The U.S. is currently facing the worst measles outbreak in over three decades, with 1,288 cases recorded so far this year, surpassing 2019's total of 1,274 cases.
Recent outbreaks began in undervaccinated communities in West Texas, resulting in three fatalities and numerous hospitalizations, raising concerns about the potential for extended virus spread.
Movement of the virus in North America is linked to significant outbreaks in Chihuahua, Mexico, and Ontario and Alberta, Canada, indicating a broader regional public health crisis.
The effectiveness of the measles, mumps and rubella (MMR) vaccine remains high at 97% following two doses, yet vaccination gaps exist in certain populations.
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