The emergence of novel swine influenza viruses in North America
Since 1997, novel viruses of three different subtypes and five different genotypes have emerged as agents of influenza among pigs in North America. The appearance of these viruses is remarkable because there were no substantial changes in the overall epidemiology of swine influenza in the United Sta...
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Veröffentlicht in: | Virus Research 2002-05, Vol.85 (2), p.199-210 |
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Format: | Artikel |
Sprache: | eng |
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