History: One week ago, my favorite hen was sorta staying to herself, rather than with the other girls. That afternoon, her breathing sounded like "rattling", while she was in the nesting box to lay an egg. I started entire group on Duramycin in the drinking water. Roo was the only other one acting "off", he seemed a little subdued. All eating and drinking well, bright and active. The next day the rattling turned to gurgling. Day 3, Roo is back to crowing, and 100% normal. No one else shows any issues. On day 4, a few bubbles in the corners of her eyes. I'm still hoping this is how it normally runs its course. Day 5, some stickiness around nostrils. Added VetRx to the mix. Day 6, I conclude the Duramycin is not going to cut it. I ran from place to place til I found Tylan. Found Tylosin Tartrate powder, which suited me as I'm not confident about injections, and would prefer to treat the entire flock since anything respiratory is supposed to be very contagious. Because they'd already had Duramycin this day, I waited til the morning to switch meds. Day 7: mixed 1 t or 2 grams per gallon-- I measured and weighed. Based on info I found on this site I added cranberry juice and cherry jello to make it more palatable. Pulled up some concentrated med/juice into a 3cc syringe, before I fully diluted it into a full gallon. I wanted to give her some orally-- to ensure she gets enough and gets a good start on the Tylan. Turns out she was not fan of this idea, but she probably had 1/3 of her daily dose directly and she'll get the rest in drinking water. She's still pretty bright, eats well, drinks well. Her breathing is often audible, she sounds congested. She sometime sneezes. But other than that, she is pretty bright, comes running for something to eat, and I see her drinking through out the day. She is still with the flock-- I started to separate her but she was mad. (She busted out of the shower and was prancing through the house-- I figured she felt well enough to be out) What am I missing? Am I doing everything I should for her? I'm a newbie, this is my favorite hen, the one who likes to eat out of my hand.