My hen, Ra, has had this respitory disease for a while now. She once and a while gets the foam in the corners of her eyes, she sneezes alot but her nose is dry, no runny nose or snotty blockages. She weezes a lot and has a raspy voice. Also, when I looked down her throat, there seems to be a lot of foamy saliva in her mouth. She's drinking and eating normally, shes not thin or losing weight, shes actually pretty fit. I lost a rooster to similar symptoms, he was fine then it brought him down until he died. Please, help!