I've had chickens for about 8 years now, and have wormed them periodically with Eprinex to their necks. I have followed many thread about problems, worming, illnesses, etc., many times reading advice from Dawg and Kathy about worming and dosages of various medications. Well, I finally decided to take the plunge and worm with valbazen. I filled several syringes and over one evening and the next morning managed to dose each of my 50-ish chickens. The morning after the first half of my chickens were treated, I went into one of the coops and OMG!!!! There was one worm-filled poop. It was absolutely loaded with "spaghetti." We did have one hen that had been "off," which is why I finally decided to worm the flock. I have since seen her poop more worms. She is "pinking up" and acting much better now. I haven't seen any worms in the rest of the flock, but where one has it ... Anyway, next week I will worm them for the second time. It really wasn't the chore I thought it would be to worm 50+ chickens, as we did it at dusk when they were all roosting for the first half, and the next half we did in the morning just before daylight. So, thanks again Dawg and Kathy for your many helpful posts about worming and dosing. I credit you both for saving my hen's life and helping me keep the flock healthy!