Yosemite campsite
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US agencies work to tackle Yosemite's virus outbreak

1 September 2012 Last updated at 10:51 BST

Thousands of people who have been holidaying in California's Yosemite National Park have been alerted following an outbreak of a deadly virus.

Two people have died and four others have been infected by Hantavirus, a rare lung disease.

Lola Russell, of the Centers for Disease Control and Prevention (CDC), said they were working closely with various agencies to tackle the situation.