I'm writing because 4 of my 5 chickens are sick with runny noses, a cough and frequent sneezing. They live together in a 20 x 20 fenced in coop and since they've been sick (almost 3 weeks) I have not been giving them free range. I rake their coop regularly, give them fresh water daily and change their food out frequently too. We go out about 2x a day to give them treats (fresh chopped veggies) 1 is about a year and a half old, Maggie (Plymoth Rock). She is currently laying but she displays the symptoms above 1 is about 4 months old, Blue. Blue is an Indigo Blue Brahma. Blue concerns me the most and I've uploaded a video of her strange behavior. She nestles down to the ground suddenly with her eyes closed and she sort of drifts into a passed out state / her head moves around. She has the least amount of energy among the group. 2 are about 5 months old, Orange Sunshine & Sunny, Lemon Cuckoo Orpingtons. They're both showing the signs of a cold. Orange Sunshine was demonstrating the same odd behavior that Blue is still doing but she seems to be much better. These two are sisters but Orange Sunshine is noticeably more scrawny than Sunny. Lastly, we have a 4 month old Americauna and she seems to be the healthiest of the group! Have not seen her sneezing or coughing and she has lots of energy for running around & hunting. We live in Southern California and it is starting to get warmer outside. Today, Blue was not looking good towards the end of the day so we gave her a bunch of fresh water and greens and she perked up. Now everyone is nested in the coop for bed. The cold symptoms started almost 3 weeks ago and we have been giving them Tylan 200 mixed in with cold scrambled eggs for 10 days. They seemed to be getting better but have taken a few steps back over the last 2 days. We also put duramycin in their water and rub diluted VetRx on their beaks and sometimes squirt it down their throat when they'll let me. Do you have suggestions on alternative care? I am considering giving them the Tylan by injection or with an eye dropper strait down their throat for a more direct dosage.