Hundreds of children became ill with symptoms of food poisoning in Hamamatsu , Japan . Police believe norovirus caused the outbreak . Health officials are testing school lunches to determine the origin of the illness . The city 's hygiene office is testing school lunches eaten by the students to confirm the cause of the outbreak , Ishizuka said . The outbreak follows a food poisoning outbreak that left 1,400 people ill in recent weeks .
Hundreds of children became ill with symptoms of food poisoning in Hamamatsu , Japan . Police believe norovirus caused the outbreak . Health officials are testing school lunches to determine the origin of the illness . The outbreak follows a food poisoning outbreak that left 1,400 people ill in recent weeks .