quickly how serious this is but also how rare this is. the cdc report from 93 to 2011 there were 587 cases. you can not get the hantavirus from another person. it comes mostly from rodent droppings. the problem, the virus is deadly. about 30% of the people who get it die. that means if 10 people have it, three of them will die and there is no cure. it attacks the respiratory system very rapidly. at yosemite park this hour they're shutting down and disinfecting tent after tent. they have been doing this for a couple of weeks. what is different now first they thought the virus was limited to one area of the enormous park. now they're saying, no, they will look at tent cabins in many different locations. the world health organization has issued a global alert this week regarding the hantavirus cases in yosemite. they're telling travelers all around the world who come here for this destination point, yosemite, to avoid any exposure to