Earthworms can be intermediate hosts for Blackhead. Having earthworms does not mean there is blackhead present.I think asking the USDA vet in your area or others with turkeys and maybe even on the State thread here on BYC.
I do not think it is recorded anywhere, When I talked to the State Vets and USDA vets when they did my NPIP inspection they knew of a couple cases but none close to me. Of course, I live on sand the scars the poop out of earthworms. Hence no earthworms, no blackhead.
When I got my turkeys I was not sure. There was a turkey farm 40 years ago about 3 miles from here, my uncle worked there and did not recall a case of blackhead. They did not have chickens, however, back them the turkeys basically free ranged a 40 acre pasture. I just decided to go for it and try, the worst that could happen is the turkeys die.
I know some will disagree, but I hardly ever worm here. Maybe once every year to year and a half. I just do not have them here. I use vinegar and cayenne pepper to discourage worms from staying around. I will worm this breeding season. That will be about 18 months from my last worming. I have never seen a worm in any of the birds I process. I figure processing a bird is a good way to look for worms. I could be wrong. I normally am.
I live on a sand dune. One of the first things that I did was bring earthworms with me. Now my property has earthworms anywhere there is enough moisture for them to survive. I have even brought in nightcrawlers. There was never any poultry here before me and there was not then and still isn't any blackhead but there sure are lots of earthworms.
I have never wormed any of my poultry and have never seen any indication of any type of worms in them.
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