I wish I could blame it on someone else....but its my fault apparantly... I give my birds ivomec by mouth, one at a time (I have about 60) twice a year. I assumed that was enough, as I have had no other signs of trouble. Those are my chicks, from my flock. Ughhhh.......I took all of the waterers out this evening, and in the morning will but Wazine in each of them. I guess I will continue to give the Ivomec twice yearly, but I will add the Wazine another two times. I have recently found a poultry vet, the next time I have occasion to speak to her, I will ask the specific question about transference from hen to egg to chick. If anybody has any comments....I am all ears!!!