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I am a veterinarian, but poultry medicine has been long forgotten. I have a client who has gotten in to the egg business. He purchased about 75 laying hens and 20 pullets of various breeds and from various sellers. It appears that they are developing upper respiratory tract infections. THe pullets are more severely affected but recover sooner than the adults, the URTI seems to linger with them. Symptoms are lethargy, conjuctivitis, with severe purulent ocular discharge in some cases, sneezing, a mild cough. I have also seen a few with foamy and/or liquid feces. As stated before, the hens appear to be affected longer. Have tried tetracycline and amprolium in the drinking water and the eggs are being discarded... I need some direction on what this is and how to treat. It is hard for me to get a fresh bird for necropsy, but that is my next step.