Health officials have announced two new hantavirus victims, bringing the total number of people who contracted the deadly airborne disease at Yosemite National Park to six. The disease has killed two people since July, prompting park officials this week to close 91 tent cabins. They've also scrambled to send health advisory emails to thousands of campers who visited the cabins this summer.

But given the park's previous brush with the virus, it's not clear whether officials have done enough to prevent the disease and inform guests – or whether they're spreading accurate information.

The disease comes from inhaling or ingesting particles of mouse feces or urine and has a 40 percent mortality rate.

Although it's not clear how long the virus survives outside the mouse's body, Dr. William Schaffner, the chairman of preventive medicine at Vanderbilt University Medical Center, said that when the mouse feces and urine dry, they become more dangerous because they can easily be carried into the air and breathed in.

http://abcnews.go.com/Health/campers-question-yosemite-response-hantavirus/story?id=17117219#.UED-PuytyDs