Influenza type A in humans, mammals and
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Susan J. Baigent; John W. McCauley
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Article
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2003
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John Wiley and Sons
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English
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## Abstract The virulence of a virus is determined by its ability to adversely affect the host cell, host organism or population of host organisms. Influenza A viruses have been responsible for four pandemics of severe human respiratory disease this century. Avian species harbour a large reservoir