Nearly 200 people across the state have reported illnesses after attending a high school cheer and dance event in Everett earlier this month.
Preliminary survey results show at least 192 reports of illness from participants and adults who attended the event Feb. 4. Students and adults from Columbia River and Skyview high schools in Vancouver attended the event.
The Washington State Department of Health is investigating the cause of the outbreak.
As part of the investigation, questionnaires were sent to participants and their families and stool samples are being collected for testing at the state Public Health Laboratories.
More than 3,000 people attended the event and more than 1,000 competed in the State Cheerleading and Salute to Spirit in cheer and dance/drill.