Norovirus is to blame for the sickness of dozens of people at the Elk Lake Resort recently. Though we'll probably never know the source of the Norovirus. Fecal samples tested positive for Norovirus, but the water system tested positive for Coliform bacteria, not E-Coli.  Tom Kuhn with the Deschutes County Health Departments, says Elk Lake Resort's water system has been sanitized and given the OK to reopen. “Tests show Coliform is negative in the water now, so it's looking good, but we're going to continue to monitor it. There have been no new illnesses in the last week. So it's going to subside, but we're going to keep close eye on it. We’re working with the resort.” Norovirus is the leading cause of food borne disease in the U.S.