Vials of the measles mumps and rubella (MMR) vaccine are displayed in February in Lubbock, Texas. (AP Photo/Julio Cortez, file)

Fourteen people in northeast Wisconsin have been infected with measles, state health officials said Friday.

The Department of Health Services first reported nine cases of measles in Oconto County in early August. All five of the newly reported cases are linked to that outbreak.

Officials said ages of the infected range from 7 months to 53 years old. Most are unvaccinated.

Stephanie Schauer, the state’s immunization program director, said one dose of measles vaccine is 93% effective at preventing infection, and the recommended two-dose course is 97% effective. In the absence of vaccines, she said, measles is “one of the most highly infectious diseases that we h

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