Answers are grounded in this paper and cite their sources.
Eurasian (EA)-origin H5N8 clade 2.3.4.4 avian influenza viruses were first detected in North America during December 2014. Subsequent reassortment with North American (AM) low-pathogenic wild-bird-origin avian influenza has generated at least two reassortants, including an EA/AM H5N1 from an apparently healthy wild green-winged teal, suggesting continued ongoing reassortment.
No takes yet. Share an insight, caveat, or question.
Torchetti et al. (2015) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: