It's a nightmare trying to Google decent information on swine flu right now. SO. I beseech thee, holy intarwebs! Hear my query!
In avian flu, the key "antigenic shift" that can rearrange a poultry-to-poultry flu virus into a poultry-to-human virus (or human-to-human flu virus) occurs, typically, when there is prolonged contact between birds and
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