This was posted to Facebook on a chicken group I follow within the last few hours.
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"Wild bird reservoir species
Birds of the Columbidae family (pigeons and doves) and double-crested cormorants (Phalacrocorax auritus) have been implicated as reservoir species for virulent strains of NDV in North America [31]. Sampling of mute swans (Cygnus olor) in the Great Lakes region and along the Atlantic coast of the United States resulted in the detection of live virus and NDV antibodies in 8.7 and 60% of birds, respectively [32]. This suggests that mute swans are regularly exposed to avian avulaviruses and may contribute to viral maintenance in the environment. Kim et al. sampled waterfowl and shorebirds from eight states within the U.S. and compared them to samples from live bird markets collected between 2005 and 2006 and found genetically related viruses [33]. Research on NDV in wild ducks, gulls, and shorebirds found novel viral diversity, but no fusion gene sequences associated with high pathogenicity in poultry [34]. These findings indicate that viral transmission may occur between wild birds and poultry, but virulent strains are likely not reservoired by the majority of wild birds, with pigeons, doves, and double-crested cormorants being the exception."
Source:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5659000/#Sec5title