I have an older hen with symptoms that remind me of Chronic Bronchitis in Humans. I noticed this last Winter but No cough. When Summer came it got better. I did treat with Sulfamethoaxine also but it had short lived results The cough Just Started this last week on top of other symptoms. I tried the SulfaM. Drench for 6-7 Days using an Enema bottle to get it into crop(works great by the way as long as you get it way back into throat). She dried up & started eating good but came back again! I have had her inside for over a week. I started Tylan 50 (1/2cc for 4-5lb) but gave it orally due to recommendations/ comments on injection site inflamation on this site. I just completed day 5 so I need to stop. IS THERE SUCH A THING AS Chronic Bronchitis with Hens? NO OTHER HENS have it so being a Medical asst. I "assume" her condition catchy. ANY Thoughts? I WISH I could give her something to dry her up like the Sulfamethoaxine did. I NOW read via a UK site that orally Tylan only works 8hrs.(IF this is correct?) I Never noticed much of a change. One key thing I tried which leans me toward some type of Bronchitis is I used my Caruso hair steamer which requires salt to emit steam. I created a tent & I noticed NO Cough & her breathing slowed up some for about 2hrs. HELP! P.S. NO funky smells & fecal is dark but otherwise normal. Thanks!