Columbia Valley Elementary School reopened Monday morning after widespread vomiting, diarrhea and other flulike symptoms closed the school for part of last week.
Absenteeism was still greater than normal, but less than last week.
On Monday, 37 of approximately 500 students were absent. Of those, 33 were virus-related absences; 15 students were out with active viral gastroenteritis and 18 students were on the mend, said Gail Spolar, Evergreen Public Schools spokeswoman.
“Those 18 students are on the downhill side of the illness,” she said.
On any given day, about 20 students are absent.
Last Wednesday, 40 staff and students — about 7 percent of the school’s population — either called in sick or left early.
The culprit is believed to be gastroenteritis, one of the world’s most common viruses, striking schools, nursing homes, cruise ships and other places where many people are gathered together. The health department was not able to pinpoint the source of the outbreak.