A student at Squadron Line Elementary School in Simsbury has been diagnosed with typhoid fever.
School officials sent a letter home to parents that said the student is not believed to be contagious and nobody else in the school system has reported symptoms.
There are about 760 students at the school.
Tests are being conducted at the federal Centers for Disease Control and Prevention to confirm the diagnosis, which was made by a local doctor.
First Selectwoman Mary Glassman says she was told the child contracted the illness during an overseas trip.
While it is rare, the Centers for Disease Control and Prevention says about 400 cases of typhoid fever are reported in the U.S. each year.