We just started worming the chickens again, after seeing worms in one's droppings. Wazine in the water for a day, then the horse worming paste (a pea size dose, for Large Fowl, half that for bantums) 10 days later. And of course, throw out the eggs for 20 days. We just did this in March. And I think again in Dec. or so. I have a problem with wild birds coming in the coop but can't figure anyway to restrict them, but still let my girls come and go freely (Mine free range most of the day). We also had a lice outbreak in April (I think it was) so we've dusted with sevin and cleaned the coop and put down all new bedding 2x (10 days apart) too. We use the deep litter method with DE, and used to have no problems, but this last 6 - 8 months we've had these outbreaks. The only other oddity with our setup is, we have a blind bantum D'Uccle who is always in there, roosts on the floor and doesn't move around much, so he may be more prone to picking things up from the bedding and coop area and then passing it on to others through contact?? So my question is, is it safe to be worming them every couple of months? And is there something I"m missing that might help us knock out this problem better?