10,000 people at risk of hantavirus after Yosemite stays, CDC says

A new nationwide advisory issued Friday by the Centers for Disease Control and Prevention said that as many as 10,000 people were at risk for contracting hantavirus after staying in Yosemite National Park this summer. Park officials said Friday that they had sent letters and emails to about 3,100 people who reserved one of the 91 "signature tent cabins" in the park's popular Curry Village between June 10 and Aug. 24. The CDC alert — issued through its health advisory network, which reaches healthcare providers as well as health departments — said that an estimated 10,000 people stayed in the tents during that time. Six confirmed cases of the rare, rodent-borne disease have been linked to the park, officials said. Four have been traced to the signature tent cabins; the remaining two were still under investigation, Yosemite spokesman Scott Gediman said Friday...more 

If this was a private facility, you know they would be sued for negligence.  Can the feds be sued for the same?

UPDATE:

Report: Park Service warned about Yosemite rodents The National Park Service was warned in 2010 that efforts should be stepped up to inspect for rodents in Yosemite and prevent them from entering areas where people sleep, a report obtained Thursday states. The disclosure came just days after a Pennsylvania visitor became the second park guest confirmed to have died of hantavirus pulmonary syndrome. Public health officials were able to confirm both victims had stayed at the park's Curry Village in Yosemite Valley. The 2010 report issued by the California Department of Public Health was commissioned by the park service. "Inspections for rodent infestations and appropriate exclusion efforts, particularly for buildings were people sleep, should be enhanced," it said.