My 9 month-old hen expelled a big knot of roundworms this morning. She clearly had been suffering a blockage -- she was lethargic last night and this morning, walking very slowly and gingerly. Once she expelled the worms (and a big plug of poo before that) she was fine and perky. Clearly I have a worm problem, though I had seen no evidence in any of my four hens' poo before the massive dump this morning. They've appeared fine and healthy, and they've all been laying daily. I want to move quickly to deal with the infestation, as I figure it's only a matter of time before she suffers another blockage, but I'm worried about administering a dewormer like Wazine when she clearly has such a heavy load. Will this just lead to a massive die-off and an even worse blockage? I am a long-time reader of these forums and can usually find answers to my questions in previous threads, but I'm having trouble with this. Any help/advice would be appreciated.