Ms Gormley, Superintendent of the Milton Public Schools published a letter to parents on the school web site. She writes:

In our continued efforts to keep you current on the important health issues which arise in our district, we want to inform you that the Milton Board of Health has confirmed the first case of H1N1/Swine Flu in a Milton High School student. The student is doing well and expected to make a full recovery. The Milton Public School system is working closely with the Milton Board of Health to ensure maximum surveillance in our community. To this end, we are being guided by the Massachusetts Department of Public Health and the National Centers for Disease Control and Prevention.
It is very important for parents/ guardians to make responsible decisions concerning sending a child to school if sick with flu like symptoms. A check list is attached to help all parents and guardians make appropriate choices for the safety of your child and the students, staff and community as a whole.
Most important, please take common sense precautions with any family member who presents with flu like symptoms.
Contact Margaret Gibbons if you have any additional questions or concerns at 617-696-4470 ext. 1.

You can find the letter as well as a flu symptom check list from Massachusetts Department of Health here.