Patient samples from a recent outbreak of illness at Eagle Island State Park have tested positive for norovirus, the Central District Health Department said in a news release Wednesday afternoon.

More than 100 cases of vomiting and diarrhea were reported to CDHD this Monday and Tuesday, prompting the Idaho Department of Parks and Recreation to close the swimming area at Eagle Island. Park staff is working with CDHD and DEQ to lower lake levels and thoroughly disinfect impacted facilities.

The swimming areas at Eagle Island will remain closed for two weeks to allow for drainage and refill of the lake. All other areas at the park will remain open for recreational use.

Norovirus is the most common cause of sudden-onset vomiting and diarrhea, CDHD reports.