My flock of 16 is all sneezing, with a hand few that seem droopy and not as energetic as normal, while one almost died on me about two weeks back with projectile diarrhea that seemed to have a lot of urates in it and still seems lethargic, atleast a lot more noticeable than the others, but is beginning to show improvements. I believe they may have Infectious Bronchitis but I would like to hear opinions from others. Possible symptoms and occurrences: 1. Finding one broken egg or very brittle egg a day from one of new introduced hens 2-3 years of age. 2. Introduced two roosters that shed intestinal lining daily and sneeze occasionally possibly due to sand bedding? 3. Egg production dropped basically to nothing around mid to late September with average temperature being around 60 to 70 in day and 40 to 50 at night. Any eggs that are laid are losing dark brown pigment, closer to white eggs now. No other symptoms at this time besides one hen isolating herself. 4. Hen isolating herself falls very ill about 1 week after isolating herself with projectile diarrhea that went from tan, to bright green, to white urates. I gave Valbazen to deworm whole flock and she came around somewhat but her stool is still watery with undigested grass. Seems to be condensing but she still acts lethargic at times. 5. A few sneezes from other flock members start about a week after reintroducing sick hen. Been roughly 3 weeks since roosters been in flock. 6. Within a week whole flock is sneezing besides sick hen. Clear liquid on beaks and chicken wire above roosts. Roosters' liquid seems thicker and more mucous like. Head shaking also seen in all that are sneezing. 7. Going on 1.5 weeks of sneezing flock starts some rattling/gurgling when breathing on roost at night. 8. A few hens seem to have good days and bad days where I catch them with eyes closed in the yard, but then later they're running around. Droopy, discolored combs on lethargic hens. Sometimes tucking head behind left wing or mouths open and distressed after sneezing. 9. Feed intake and scratching activity has deminished greatly and I've noticed a lot more resting. 10. Nostrils have dirt in them. 11. Out of roughly 20 eggs layed in the last month from 14 hens, I got an egg with a wrinkly top today. A lot of eggs seem porous although it could just be one of the older hens laying consistently. 12. Some white stained vent feathers but I haven't noticed much diarrhea under roosts. Things I've tried: 1. Vitamins and electrolytes in water 2. Apple Cider Vinegar 3. Buttermilk mash with game bird feed and frozen fruit. 4. VetRX on roosts, cold in water, warm in water, rubbed on beaks and into nostrils of all 16 chickens. 5. Just today completely cleaned out and sanitized coop with bleach solution. 6. Replaced sand bedding that I was cleaning daily with pine wood chips. Replaced roost 2x4s. 7. Began sanitizing waterers daily. 8. No antibiotics yet. 9. I am going to lightly spray coop surfaces with lysol or bleach solution daily and let air out. Questions: 1. What antibiotic should I start them on to prevent secondary infections? Any effects on eggs or withdrawal periods? 2. If it is Infectious Bronchitis, how long will they be carriers for? I have seen several weeks, been told 1 year, and have also been told any respiratory disease means lifetime carrier and to cull the bird. Please provide where you are getting your information or knowledge from, I am becoming very confused with this!! 3. What else could I try? I have seen oil of oregano has helped someone before... anyone else? 4. Will this just keep getting worse or does it get worse before it gets better? 5. How long till my flock recovers? I am asking help from anyone that has ever experienced something similar to this before in their flock. Does anyone feel safe saying it's not MG or Coryza? I am in south central Pennsylvania and currently trying to find someone to test for me. There is no smell coming from nostrils or watery eyes. No pus or colored discharge. No swelling or pimples/bumps around eyes. Please help me get these sick birds back to their spunky selves, I'm tired of them being sick!!