After spending three days at the 2014 Future Business Leaders of America state leadership conference in Vail, three Fossil Ridge High School students and multiple other PSD students reportedly contracted Norovirus, a disease common among large groups of people. The students—10 in all—were quarantined at home until the virus was gone, and school administrators were advised not to allow the infected students to attend class, district spokeswoman Danielle Clark told The Coloradoan.

Norovirus, commonly referred to as the “stomach bug,” is a highly contagious virus that resides in the stomach and intestines. Symptoms of the virus include stomach pain, diarrhea and vomiting. It is often confused with food poison and stomach flu, but is not a strand of influenza. It has been known to infect people through close physical contact, or touching infected surfaces and then touching one’s mouth or nose (numerous international reports told stories of Norovirus being contracted on cruise ships in 2013). There were 165 schools in attendance at the conference.

The students from Fossil were quarantined and not allowed to return to school until two days after symptoms vanished, according to the Larimer County Health Department. The FBLA trip ended April 29, but most students did not return until the following week. “It was really bad,” sophomore Bryce Jabs said. “There were people throwing up the entire way home on the bus. I am just glad that I did not get sick.”

Despite the incident, several FRHS students were national qualifiers for their events. Senior Dan Penoyer took first place in economics. Second place in Parliamentary Procedure went to freshmen Rachel Tomas and Will Beard, sophomores Bryce Jabs and Cooper Wright, and junior Naathan Mohan.

All of the students reportedly infected by Norovirus have recovered and returned to school.