norovirus

Peterson says people can remain ill for 1-3 days without it being a huge issue, but if they get dehydrated that can be serious.

The very young, people with compromised immune systems, and the disabled or elderly are especially vulnerable and may need to see a doctor if they are infected.

Frequent hand-washing and generally good hygiene are being recommended for protection against all flu-like illnesses.

All the schools also will be closed Friday heading into the Thanksgiving break, which lasts the entire week of the holiday from Nov. 25 to Nov. 29.

A virus that is often confused with food poisoning or stomach flu is being reported in Cheyenne and Casper, according to a release from the Wyoming Department of Health.

The number of cases spiked last month, but have returned to near normal levels.