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I had this question in mind so I contacted a state vet that I used to work with when I was involved in aquaculture. I thought the response was interesting and thought I would pass it on.
Current science supports the hypothesis that the virus is being introduced to the commercial poultry which are raised indoors by a couple of potential methods. It is most likely directly from the wild birds flying overhead defecating and the virus gets pulled into the ventilation system of these big houses. The commercial farms tend to get infected along the routes of the flyways that the wild waterfowl use. The other scenario that may be occurring is that the virus gets tracked into the poultry houses by people/equipment. If the wild birds are contaminating the ground and boots are not put on at a dirty/clean line in the building, hands washed, and just general good biosecurity with equipment, feed, etc., the virus can enter that way. I believe the second route is becoming less common with commercial birds because the poultry industry has really ramped up their biosecurity protocols.
Most commonly, when we see infected backyard/hobby flocks, they tend to be mixed flocks with chickens and/or turkeys, etc. WITH waterfowl that may comingle with wild waterfowl or share water sources with them, such as ponds. That is not always the case, but it is what we’ve seen most commonly.
Current science supports the hypothesis that the virus is being introduced to the commercial poultry which are raised indoors by a couple of potential methods. It is most likely directly from the wild birds flying overhead defecating and the virus gets pulled into the ventilation system of these big houses. The commercial farms tend to get infected along the routes of the flyways that the wild waterfowl use. The other scenario that may be occurring is that the virus gets tracked into the poultry houses by people/equipment. If the wild birds are contaminating the ground and boots are not put on at a dirty/clean line in the building, hands washed, and just general good biosecurity with equipment, feed, etc., the virus can enter that way. I believe the second route is becoming less common with commercial birds because the poultry industry has really ramped up their biosecurity protocols.
Most commonly, when we see infected backyard/hobby flocks, they tend to be mixed flocks with chickens and/or turkeys, etc. WITH waterfowl that may comingle with wild waterfowl or share water sources with them, such as ponds. That is not always the case, but it is what we’ve seen most commonly.