Sorry for your lossIt's pretty safe stuff, so I doubt the dose you gave killed it. How much did you use?
-Kathy
X2. Dosing margin's are very wide for a reason. The nature of this medication and how it acts to control cocci protozoa growth would make it very hard to kill a bird with it. When a bird/birds die when being given Corid it's far more likely that the coccidiosis was already to far advanced for the bird to recover or there were other problems going on as well.