BREAKING: Virus sickens 150 at Yellowstone, Grand Teton parks

The rare health advisory, tied to a suspected outbreak of the highly contagious norovirus, comes in the early weeks of a season that drew about 6 million people to the parks last year.

The warning advises visitors to the parks in northwestern Wyoming to wash their hands to stem the spread of the virus, which causes a flu-like ailment whose symptoms include stomach pain and vomiting, park officials said.

[link to news.yahoo.com]

Thanks for posting this! My oldest son is there and I just warned him!

Hope they have enough port-a-potties, that stuff is nasty.

Yep. Really nasty.