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You're right. Chicken on wire is the only way they cant get worms. If their feet touch the ground, they'll eventually get worms.
But, healthy chickens raised on dirt, not filthy litter, will often have a good resistance to worms. That's why you can see some heavily affected, others not...
I would still treat with antibiotic, probably sulfa drug like tmz-smp, since it looks like they also have e.Coli and possibly other viral/bacterial infection. Also, would give probiotics like kefir to help heal their intestine. Sorry you're going through this. I bought some bottle calves from a...
Worms are spread through by eggs in the feces. They are NOT in the meat or eggs, at least not ordinary roundworms or tapeworms, the worms chickens normally get. There are some species that infect the liver, heart and lungs.