Lethal Influenza Infection in the absence of the natural killer cell receptor gene Ncr1

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Natural Killer Cells are the body’s first line of defense against viral infections

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"The Department of Health and Human Services has declared a public health emergency in connection with the swine flu outbreak
outbreak that has killed people in Mexico, Janet Napolitano, director of Homeland Security said today [Sunday, April 26]...

The U.S. will begin screening travelers at the nation’s borders and isolating people who are actively ill with suspected influenza,
the director of Homeland Security said today [Sunday, April 26].

No travel restrictions are issued currently, but that could change, she said...

Health officials are concerned because people appear to have no immunity to the virus, a combination of bird, swine and human influenzas.
The virus also presents itself like other swine flus, but none of the U.S. cases appear to involve direct contact with pigs,
Eberhart-Phillips said," quoting MSNBC.
http://www.msnbc.msn.com/id/30398682/