A student at Derby Middle School has been diagnosed with a confirmed case of measles, Birmingham Public Schools said in a letter sent to parents Sunday.

According to WXYZ-TV, the school district is working with the Oakland County Health Department in regards to the outbreak.

Michigan law states all students are required to be immunized for the measles, mumps and rubella (MMR) vaccine.

The case is the latest in a measles outbreak that is spreading in Michigan. As of Friday, there were 39 confirmed cases, which is the largest statewide outbreak since 1991. Most of the cases were in Oakland County.

Out of the 39 cases, the ages of those infected range from 8 months old to 63 years old. At least three of the individuals had two doses of the MMR vaccine, said the state Department of Health and Human Services.

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