Any creature that eats insects, wild animals or food that has spent time in contact with soil will have worms.
Whether or not to worm is a personal decision. Are your chickens pets or are they a source of food? There is no FDA approved de-worming medication for chickens. You would use a medication for another animal with the dosage modified for a chicken. They do work and some people think that not eating the eggs or meat for 2 weeks or a month is safe enough, but I won't do it. If you want chickens for pets and you are willing to throw eggs away, then worm them when you see symptoms of worms. If you do a search on this website using the box in the upper right hand corner you will find a lot of information on this topic. It is discussed fairly often.
Whether or not to worm is a personal decision. Are your chickens pets or are they a source of food? There is no FDA approved de-worming medication for chickens. You would use a medication for another animal with the dosage modified for a chicken. They do work and some people think that not eating the eggs or meat for 2 weeks or a month is safe enough, but I won't do it. If you want chickens for pets and you are willing to throw eggs away, then worm them when you see symptoms of worms. If you do a search on this website using the box in the upper right hand corner you will find a lot of information on this topic. It is discussed fairly often.