Hi all! My poor flock of 3 has been having a terrible time lately. My oldest hen (5 years old) got sick (lethargic, loss of appetite) in August after introducing 2 new pullets to her home (I should have quarantined them for longer). I took her to the vet, she was treated with de-wormer and given 10 days of antibiotics orally (Sulfamethoxazole) plus an echinacea supplement. She went through a full molt during the 10 days, but made a full recovery except she has been sneezing ever since. I had added DE to the dust bath and egg box so thinking that could be what is making her sneeze, I cleaned out the coop, added new dust bath material (all-purpose sand mixed with soil, no DE this time), emptied/cleaned the egg box and put fresh shavings in, and replaced the wood shavings I had in the bottom of the coop with all-purpose sand instead, to reduce potential dust. I've had that set up for a couple of weeks and she is still sneezing, but otherwise happy and energetic, eating/drinking, successfully established her dominance/pecking order over the 2 younger hens etc. Now (November) one of the younger hens is sick (she is about 20 weeks old, not laying yet). I just noticed last night - she didn't go up to roost but huddled under the egg box instead. I checked on her first thing this morning and she is super lethargic/weak, not eating/drinking, wings are droopy, eyes are closed most of the time, labored breathing, poop is runny/white from the one bowel movement I've witnessed plus stuck in her feathers
. I put her in a "hospital crate" with a heat lamp, water with electrolytes, cooked white rice and scrambled egg, but she is not eating or drinking on her own. I gave her a tiny bit of water with some electrolytes by dropper around 7am. Any ideas what this could be or how I should treat her? Based on internet research, I am thinking cocci, or an internal parasite? (I don't see any mites or other external parasites) but hard to be certain. Should I get over-the-counter antibiotics and treat the whole flock? De-wormer/parasite meds? If so, what kind and where can I purchase? Any advice is appreciated! My poor girls have had such a hard time lately, I feel so bad! So far, the third, and smallest hen is still healthy and seems ok.
PS hopefully I posted this correctly as a new thread? not sure if that is the correct approach.

PS hopefully I posted this correctly as a new thread? not sure if that is the correct approach.
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