Yep, humans have intestinal parasites and you do not have to travel to a third world country to obtain them. Just like any other creature on this Earth, we all have our own parasites. You have merely to Google this fact....all the info is at your fingertips. Denying the possibility isn't going to make that go away.
I don't deworm my chickens, not because I feel they don't have them, but because they are thriving and healthy despite them! I don't have illness in my flocks and I don't have "lethargic, skinny, pale combs and feet" chickens.
My chicken's upbringing and current lifestyle is enough to build strong immune systems and bodies that are better able to resist worm infestation problems. They may carry a few but these apparently do not have ill affects on their health.
A lot of your flock's health and resistance to the side effects of worms can be traced back to your management/husbandry practices. Free range, nonmedicated feeds, clean water, healthy deep litter in the coop, normal slow down in the winter to promote good immune systems, unpastuerized ACV for probios and vitamins, healthy supplemental feeds like fruits and veggies....all of these contribute to a more healthy flock. Buying and perpetuating breeds that do well in your climate and with your husbandry practices are also key for poultry health in your flock.
Yes, it is possible to have chickens for many years without the need for deworming with traditional deworming agents.
I also have had sheep for over 2 years now that have not needed chemical intervention for parasites. Do they have them? I'm sure of it. Do they have so many that they are anemic and may become sick from them? Nope. They are healthy and thriving, just like the chickens.
It takes more than just throwing chemicals at a problem to effectively manage the health of your livestock.
