Hookworms are the biggest threat when it comes to walking barefooted on contaminated soil. Human, dog, cat and poultry feces can contain hookworms. Regarding other nematodes; food with worm eggs on it can be swallowed and infect humans. That's why we thoroughly wash veggies and fruits from the garden AND from the grocery store AND from flea markets.
Dirt under fingernails can contain eggs, personal hygiene is a must.
See this link:
https://www.washingtonpost.com/news...-images/?noredirect=on&utm_term=.e9e882502795
It's not all doom and gloom though. Not all soil is contaminated with hookworms. If our pets are wormed monthly, there's less of a risk. It's rare that poultry are infected with hookworms, but it can happen. The standard treatments are benzimidazoles in poultry.
@MotherHen75 It sounds like you're dealing with tapeworms. Go ahead and get the Equimax equine paste at TSC and dose the hen that excreted the segments as Texas Kiki mentioned. Then redose her again 10 days after the first dosing.
In order for a chicken to get infected with tapeworms, your hen had to have eaten an infected insect. That's the only way they can get infected with tapeworms, by eating an infected insect.
Here's a link for the Equimax dosage, post #1.
https://www.backyardchickens.com/th...rms-under-construction.1220309/#post-19519143