The two Sebrights have actually been in the yard for almost 5 years now, so definitely not a recent addition to the flock! The last birds I did add were 3 d'Anvers over 6 months ago, and they were and continue to be very healthy.Is she a recent addition to the flock? Did all the birds come from the same place? Have you recently added any birds at all?
I would not segregate or treat her (unless she's new in which case new birds should always be quarantined away from the flock for 3-4 weeks before introduction). I would watch all birds very closely for 3-5 days to see if any others show symptoms and if hers continue. If no others show symptoms, then she may have an individual respiratory infection. These happen occasionally, though are less common than contagious respiratory disease. With that said, you don't usually see bubbly eyes with a simple respiratory infection, and respiratory diseases like Mycoplasma are some of the most common contagious diseases out there, so be quite watchful for symptoms in other birds.
After 3-5 days, if no one else is showing symptoms, try Tetracycline in the water of the sick bird. If multiple birds show symptoms, I would suggest ordering Denagard and considering having them blood tested for common infectious respiratory diseases, such as Mycoplasma.
The sick Sebright (her name is Lux) is definitely the most flighty and nervous of my birds, and recently went through a pretty heavy molt. There has also been a sharp-shinned hawk keeping an eye on the backyard (my husband caught the hawk just sitting on top of my fully enclosed run last weekend), which always adds a bit of stress for the little hens. So, I think that it's possible that she just has a mild respiratory infection brought on by the physical and emotional stress that she's been under having weakened her immune system a bit. Definitely worried about Mycoplasma, though.
This morning she actually looked better than she did yesterday; her eyes and nose were still minimally watery, but no foaming around the eyes at all. Due to the strong winds, I kept her in the house in her crate for the morning, and made all the hens scrambled eggs with spinach and pumpkin.
Still no signs of any disease in the rest of the flock this morning, so they got to go out in the run. I looked at each of their eyes, noses, and sinuses very carefully. Haven't dosed with antibiotics yet; I guess if my sick hen is eating and drinking and improving without medicine over the next few days, I might hold off. Now that I have her separated, I can tell how much she is consuming, where it was a little difficult before, especially due to the fact that she is the top of the pecking order and tends to drive the other hens away from food, even when she isn't going to eat it. If I check on her later in the day and it doesn't look like she's been eating well, I might just start her on the antibiotics today, but hold off on the others until I see any symptoms. And that's the morning update! Thanks for the help!
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