Around 170 people who visited Yosemite National Park this month have reported becoming ill with gastrointestinal illnesses, with at least two confirmed cases of norovirus, park officials said Thursday.
The National Park Service began investigating after visitors and employees reported being sick and are continuing to investigate the circumstances surrounding the illness and conduct interviews with affected people.
“The overwhelming majority of the reported cases are consistent with norovirus,” park officials said in a statement.
The majority of those who became ill spent time in Yosemite Valley around the first week of January. Park officials say there has been a decline in new cases in the past several days. While those who reported becoming ill had symptoms of norovirus, park officials say some might have had food poisoning or the flu.
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