I give up with the vaccine and stuff. I vaccinated my uninfected birds last year (which worked). But this year all my grow out birds and pullets got it. It doesn't seem to be as bad this year (so far, fingers crossed). It may be due to the switch to fermented feed. They act a bit under the weather, but are still eating and drinking fine, unlike last time. Am I going to have this problem every year I have new birds? Should I try and plan for it, adding some extra veggies or something to their ration at this time of year?