A letter to parents of Redding Elementary School students says one of the children at the school is the fourth confirmed case of measles in the state.  The letter sent home this week said the child, who was not vaccinated, did not pick up the infectious disease while at school, but did attend class while infectious .  

The disease can spread quickly to others who haven't been vaccinated.  Parents were advised to check their child's immunization status. 

In February, an infant and an adult living in Fairfield County were confirmed infected while last week an adult in New Haven County also was confirmed to have measles.