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New strains of influence usually arise in countries like China, where is the virus can move among pigs and birds kept close to their human owners. With each relocation the virus’s genes can change just enough to present a health risk the following flu season.
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© 2009 Karen Kasmauski
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New strains of influence usually arise in countries like China, where is the virus can move among pigs and birds kept close to their human owners. With each relocation the virus’s genes can change just enough to present a  health risk the following flu season.