I am hoping someone can give a bit of advise! We lost one chicken to an upper respiratory infection early June 2010 after buying 4 new chickens and ducks to join our original flock of 6 chickens and one cockeral. Soon after this 2 chickens started sneezing and looking off colour (one new and one of our original girls). We gave them antibiotics from the vet and wormed all the chickens. We have since lost 2 chickens a week after each other of peritonitis, and are waiting for the postmortem results of the latest death on Friday (this was the older sneezing one). I am giving them citricidal in their water at the moment as I have heard that is good, but the new girl is still sneezing and another new one has her back hunched and tail down. They all still seem to be eating and drinking well. So, we have 2 of the original 6 girls left and they have just started laying again (both looking slimmer than before and one with a pale wattle), 4 new girls who should be about laying age and not started yet. The cockeral and ducks seem ok at the moment! Any ideas on what could be causing the peritonitis? thanks!