Okay. . . I know this is a repetitive thread here. I've read them all and still have a few questions, hopefully I can get some help. I recently acquired some chicks to add with my flock of 6. They were sneezing and on duramycin when purchased. Had I have been more knowledged in keeping chickens this would have been a red flag. However they seemed fine and receptive to the duramycin. Let them free range when the weather was nice. Then I purchased more chicks from same breeder. Joined a Facebook site and found there was someone else who had purchased chicks and they were all sick. During this time I did research and figured it was mg. Got a message that the chick the other lady sent off was ms positive. Well I have had to cull 4 of 8 chicks from the first purchase. And I have 11 in the house that I'm treating with duramycin. I have ordered denaguard. Should be here tomorrow. My question is do I treat the little ones in the house with denaguard after the duramycin. Or stop and start denaguard. I will be treating the older chicks ASAP. One had bubble eye. The other three couldn't stand / walked funny, but no respiratory problems (that I was aware of) they have All been culled. The remaining 4 seem okay???????? I realize that I should cull all, but don't have the heart to do it. So before it's mentioned, I will have a closed flock until all have passed. Thank you, Melissa west