Yosemite park hantavirus alert to 230,000 campers 13 September 2012 Last updated at 20:12 ET
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Yosemite park rangers have expanded a health advisory about a killer virus to nearly a quarter of a million people who have stayed there since June.
The mouse-borne hantavirus is now known to have infected nine people - three of whom have died. There is no known cure.
Officials at the California park insist their letters to more than 230,000 people are purely precautionary. To read more > http://www.bbc.co.uk/news/world-us-canada-19594542?print=true
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