(Portland, OR)  --  An elementary school near Astoria is closed due to an outbreak of the flu.  Officials at Hilda Lahti Elementary School in Knappa have cancelled classes today and tomorrow for kindergartners through sixth-graders.  School officials say about 43-percent of their students have contracted the flu so far, as well as several teachers and staff members.  Superintendent Paulette Johnson tells the Daily Astorian that some classes yesterday were down to just four healthy students.