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I do not believe this for one second. They absolutely cannot know this unless they have tested 75-90% of all backyard flocks in the U.S. ....
If a sufficiently random and sufficiently large enough sample of backyard flocks have been tested and rates varied between 75-90%, then it can be extrapolated to cover all flocks. Getting a sufficiently random and large enough sample does seem like it would be difficult, however.
I do not believe this for one second. They absolutely cannot know this unless they have tested 75-90% of all backyard flocks in the U.S. ....
If a sufficiently random and sufficiently large enough sample of backyard flocks have been tested and rates varied between 75-90%, then it can be extrapolated to cover all flocks. Getting a sufficiently random and large enough sample does seem like it would be difficult, however.