Maybe it’s due to the rise of the Sydney strain, or maybe because of the extra long North American winter season, but there continues to be a lot of norovirus floating around. The Denver Post reports that at least ten high school students have norovirus-like symptoms after attending a Future Business Leaders of America conference in Vail.

About 2,000 students from 165 schools across the state were attending the conference that began Sunday, and stayed in several hotels throughout the Vail area. Authorities said the first students with symptoms apparently were staying at The Sebastian hotel.

The conference concluded Tuesday, and students have returned home. But the state health department expects more cases will be reported due to the close proximity of students to each other on buses and in hotel rooms and the highly contagious nature of stomach viruses.

On Wednesday Larimer County Department of Health and Environment was investigating 10 reported cases of students in the Poudre School District who were suffering similar symptoms after the conference, according to spokeswoman Jane Viste.

In related news KPAX reports that, Missoula health officials are investigating multiple illnesses that appear to be norovirus and it is unclear if they are related.