Two people in Livingston County have come down with mumps, according to health officials there.
Both live in the county, and both were fully vaccinated, said Kathy Root, who directs patient services for the county health department.
Two vaccinated people in one county contracting the disease is statistically unlikely, but still possible, Root said.
“No vaccine is 100 percent effective,” said Root. “But we have to keep vaccination levels high if we want to prevent further spread.”