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. 2016 Aug;37(4):501–511. doi: 10.1055/s-0036-1584953

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Fig. 1 — Reservoir of influenza viruses. It is known that wild aquatic birds are the source of all influenza viruses in other species. Although transmission between humans and pigs had already been demonstrated and confirmed, direct transmission of avian-to-humans have been less frequent (such as those with H9N2 and H5N1 subtypes) but sometimes with fatal outcome.