Susceptible state
Overall, only 78.5 percent were fully vaccinated against the measles virus with the MMR (measles, mumps, and rubella) vaccine. That’s well below the target of 95 percent vaccination coverage, which is the level needed to keep the virus from spreading onward in communities. With the high level of exemptions, the maximum MMR vaccination coverage the state could attain is only around 85 percent.
Measles outbreaks have been raging in several places inside and outside the US. But so far, Idaho has been quiet, with only nine cases detected since the start of 2026. Those cases were in three counties, and all involved people who were either unvaccinated
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