The parasite just sort of takes hold in the good soil too, via the carriers: chickens--> earthworms --> cecal worms. That's why some folks caution ranging turkeys with chickens.
Is it best to avoid earthworms for chickens? We do vermiculture composting.
Oregano and garlic are also powerful natural healers, too, to add to what Bogtown Chick said. Not sure if both are safe for chooks, though.
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