Had what i think was infectious coryza in my flock two years ago. At the time i had just started keeping chickens and had a mixed flock from about five diff places. Stupid I KNOW NOW! Also did not know survivors carry the disease for life. I still have one of them ( my first hen) and 18 others. Was up to 30 in four sep pens but had to cull 8 due to illness and have lost to in the last two days. Each morning i go out to check on everyone and the past two mornings i have had one with bubbles in the eyes and that awful smell. I seperated them and gave them auromycn feed and vetrx water. It was around seven am when i sep them. By 4pm they were dead. One was yesterday and one was today. The first time this happened my birds toook days or weeks to be sick enough to die. I have never seen one go from first symptoms to death so quickly! I am in shock. I also have also recently learned that keeping chickens of diff ages together is not good. I am down to two pens now. One pens is ok for now but these are my main producers and i have had almost all of them from chicks. 6mo to 2.5 yrs. so i am very attached and culling them all is not an option for me. Do not plan to have any more until whatever survies this round are all gone and our property and pens have been heavily sanitised with chemicals and time. But I am at a loss as to why it is happening so fast. From my research the mortality rate should not be this high or act this fast? Could I be dealing with something other than Infectious coryza? Someone Please HELP! Buying tylan tommorrow to treat all birds even the ones who seem ok because i knoe they have all been exposed at this point. Also should I have an concerns about my dogs, rabbits, or goat becoming ill? I know that most diseases do not go from species to species but worried!