At least 118 Grand Canyon tourists have been struck down with highly contagious norovirus since May

The Grand Canyon National Park has seen more than 110 cases of a gastrointestinal illness closely resembling the highly contagious norovirus since May, health officials said. 

As of June 10, the park listed at least 118 people who have become sick with symptoms similar to those of the norovirus, which causes vomiting, diarrhea, cramping, body aches and a mild fever, the Grand Canyon News reported. 

The Grand Canyon National Park, the National Park Service Office of Public Health, Coconino County Health and Human Services, Arizona Department of Health Services and the Centers for Disease Control and Prevention are working to identify the cause of the outbreak, which saw cases erupt last month. 

One such case came on May 15, when a hiker trekking the canyon came across two people…