Unfortunately I have lost 2 out of my 4 hens to what I think was a respiratory issue. They did not have any outward visual signs, eyes remained clear, no moisture from their nose, still ate until the end, still laid until the end. Their droppings seemed fine. The symptoms they did have was hoarsness, labored breathing, what sounded like sneezes and coughing I think. Not really sure what chicken coughs and sneezing sounds like but that was my best guess. I wasn't sure if the eggs were safe to eat, so I discarded them. I did try antibiotics, they did not help. My 2 remaining chickens seem to be fine, no symptoms. I bleached the coup, discarded old nesting material and replaced it with new. The water is cleaned and I did add apple cider vinegar to it for gut health. I just ordered and waiting for Rooster Booster Wormer. I was going to get a necropsy from UC Davis but could not afford it. I was not able to get them into the vet, they were too booked and didn't want to pay emergency fees. I feel really bad.