Mariposa, CA (KOVR/CNN) - New worries for tourists worldwide.
Health officials have sent warnings to Yosemite National Park visitors from 39 other countries, about a potentially deadly hantavirus uncovered at some of the park's cabins this summer.
The Centers for Disease Control and Prevention says up to 10,000 people are at risk.
So far, the deadly lung disease has infected six people, and two of those people have died.
The CDC says fever and fatigue, a history of potential rural rodent exposure, together with shortness of breath could be indicative of the Hantavirus.