...more thoughts to answer the other part of your question....
If you feel this is a worm, or simply want to worm your hens, since you sell your eggs, you probably want to remain within FDA approved wormers for laying hens.
That means Hygromycin B, as that is currently the only approved wormer. Fortunately it does effectively rid round, capillary and cecal worms. It requires continuous feed for several weeks (up to 6 weeks to rid cecal).
There is no egg pull time and you purchase it in pellet form to add to the feed. The two brands available are Rooster Booster Triple Action Multi Wormer and Durvett's Strike III. I have found good deals on it at Amazon as it tends to be somewhat spendy...but if you want to remain within FDA approval for sale of eggs, that is the only wormer that will keep you technically "legal." (Technically if you use an off label product, you are never to sell eggs from that chicken ever again...many "wink" at that and follow appropriate egg pull times with the commonly used wormers that used to be FDA approved, but that is a personal decision.)
Wazine will kill round worms. There is a 14 day pull time after last application for meat, which is generally used for egg pull time. Treat, then treat again in 14 to 30 days.
Pumpkin seeds help to flush worms, but will not eradicate a heavy infestation nor will they kill the worms. It just helps to flush live worms out of the bird ready for the next bird to pick up and ingest. If you choose to use herbals, you must keep very clean litter conditions and rotate your fields regularly to avoid worm build up.
If you desire to stay organic, you will have to use something like Vermex or Molly's Herbal (which actually does work for prevention as it has wormwood but not for eradication).
The other thought is to use Ivermectin which is again not FDA approved but you only need 2 successive treatments with 7 day pull date from treatment. Ivermectin clears most internal worms (except tape and fluke) and many external parasites (except red roost mite and feather mite). I have research which shows Ivermectin clears in 6 days from egg residue, so eating eggs by day 7 is residue free.
Edited by Lady of McCamley - 11/7/15 at 8:49pm