I have a orphington that is 2 1/2 years old wheezing. She is having a hard time breathing in and out. Her comb is a purple red and she does not look good. I put some Vet RX on her beak and in the water but I am not sure what it is. I have another in the flock sneezing. I am not sure if these birds are coming down with a repertory infection. What should I treat them with or do?