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Tourists watch the 'Old Faithful' geyser which erupts on average every 90 minutes in the Yellowstone National Park, Wyoming on June 1, 2011. Yellowstone National Park, was established by the U.S. Congress and signed into law by President Grant on March 1, 1872. The park is located primarily in the U.S. state of Wyoming, though it also extends into Montana and Idaho and was the first national park in the world. It is known for its wildlife and its many geothermal features, especially the Old Faithful Geyser.
A very contagious, gastrointestinal Norovirus bug often found on cruise ships has been plaguing our national parks. So far this year, it's sickened 200 people in the Yellowstone and Grand Teton National Parks.
For more, we're joined by Al Nash, public affairs officer from Yellowstone National Park.