No one has mentioned the time span to throw the eggs away after de-worming your chickens. I used Ivermectin and was told to throw my eggs away for 3 days. I would like to play it safe and no guessing. This is the first time I have ever de-wormed my chickens, I am still learning. I have 10 mixed road island reds. I have had 4 die with in a year span and did not know why until some one mentioned worms. So I wormed 2 days ago and I have spunky chickens..lol I have also increased there ventilation.