This virus is a brand new strain of influenza A H1N1. While other forms of H1N1 cause the common "seasonal" flu, this strain has never been detected before in swine or humans.
It appears to contain the DNA of: North American swine influenza; a swine influenza virus typically found in Asia and Europe; human influenza A; and a North American avian influenza.
The U.S. Centers for Disease Control's Dr. Anne Schuchat calls it "an unusually mongrelized mix of genetic sequences."
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