As the World Health Organization raised the threat level from the swine flu to 4 out of a possible 6, a top expert warned that a big danger is that the virus could combine with a drug-resistant strain of a human flu virus currently in circulation.Laurie Garrett, a senior fellow in global health at the Council on Foreign Relations, said she is 'very, very worried' that the swine flu virus could link up with the common human flu version called H1N1 that is resistant to the Tamiflu drug.
SFGate: Politics Blog : Dangers to watch for in swine flu
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