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I believe this to be true in part. Think of all the new people who post in the health and illness section. Many of them wonder why fluffy and poofertail sniffle or have bubbly eyes, or why the ten chickens they bought at auction are dropping dead, etc.
They're new. They don't know. They got that sick bird/disease from somewhere, and I guarantee the hatchery didn't drop the birds off at the auction, it was likely Joe Schmoe from down the road who got sick of his chickens or hatched too many.
Now, I differentiate educated small HOBBYISTS from the casual keeper of some random layers or a barnyard flock. There is a difference between those who simply have some birds running around their lot that they throw scratch to a few times a week and those who build runs, carefully choose breeds, read up about diseases, are aware that there ARE vaccines for poultry, etc.
Different even from them is the dedicated poultry fancier. It's the educated small hobbyist who got the fire in their belly for poultry, who has the passion for a particular breed or breeds and enjoys showing, who wants to preserve the breed in the form it is supposed to be according to the standard of protection. These people do take some of their birds off of their premises to areas where large numbers of other birds are, but many are very aware of potential risks and guard against them. Most quarantine, many vaccinate for more than one disease, they pay attention to birds cooped around theirs at the shows. They often educate others.
Now I realize each description is a stereotype, and there are always people who are a mix of one or more, or who don't fit the mold... but I digress.
My point is that some of the small joe schmoe chicken keepers, the ones with little invested in their chickens, the casual swappers,... and even the well intentioned but unexperienced backyard flock owner- they do carry and spread disease. The large poultry producers often practice 'all in, all out', many vaccinate. If they get an illness, it's not the loss of a small flock of ten, but the loss of thousands of birds and loss of income.
I'm not saying mass agriculture keeps birds in pristine conditions with plenty of room where they experience little stress, but I am saying that I don't think they are responsible for a lot of the small outbreaks of poultry disease we see.
As hobbyists, it is up to us to educate others, to teach new chicken owners and to advocate for vaccines, quarantines, and proper flock management.