Yosemite national park: 170 recent visitors suffer norovirus symptoms

Two cases of upset stomach and diarrhea confirmed as norovirus, as park says it is undertaking 'extensive cleaning' efforts

Roughly 170 people who have visited Yosemite national park in recent weeks have suffered upset stomachs and diarrhea, symptoms that park officials say are consistent with norovirus.

Two of those cases have been confirmed as norovirus, park officials say. The park spokesman Scott Gediman issued a written statement that most of those who fell ill had spent time in Yosemite Valley around the first week of January.