A highly contagious, flu-like virus that causes stomach pain, vomiting, and diarrhea has sickened an estimated 200 people in Yellowstone and Grand Teton national parks, prompting park officials to take extra precautions in stemming its spread.
A highly contagious, flu-like virus that causes stomach pain, vomiting, and diarrhea has sickened an estimated 200 people in Yellowstone and Grand Teton national parks, prompting park officials to take extra precautions in stemming its spread.