There was a note sent home to every child in the elemantary school this afternoon

There was a note sent home to every child in the elemantary school this afternoon. It was a notification that there had been an increasingly amount of student that have fallen ill with the flu. It described the signs and symptoms and requested that parents keep children home if they were running a fever of had flu like symptoms. What does this small outbreak classify as? Pandemic Epidemic Influenza A&B Local illnesses