What virus is going around the Grand Canyon?

A large norovirus-associated outbreak of acute gastroenteritis occurred in the Grand Canyon backcountry among river rafters and backpackers during April–June 2022. Preliminary analyses of illness characteristics and portable toilet specimen test results suggested norovirus as the primary causative agent of illness.



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Grand Canyon reports 118 cases of gastrointestinal illness, norovirus found in several park visitors.

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Baird said some visitors have tested positive for norovirus. Norovirus, which can be spread through infected people and contaminated food and water or by touching contaminated surfaces, causes “sudden-onset vomiting and diarrhea” that lasts one to three days, the park said.

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This is the largest outbreak of acute gastroenteritis documented in the Grand Canyon National Park backcountry. Preliminary analysis of illness characteristics and portable toilet specimen test results suggested norovirus as the primary causative agent of illness.

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The Grand Canyon tops bucket lists across the world, and yet, it faces threats from every direction. Uranium mining risks contamination of precious water sources, and proposed developments threaten the natural, cultural, and scenic values of the canyon.

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