so i have a white plymouth rock Bantam rooster who has been sneezing and spitting a very little bit when he dose sneeze has been going on for over 3 weeks. i treated him with tylon 50 (6 injections to the beast, one a day for 6 days 1/4cc) with little to no improvement. in all other areas he seems very healthy good comb, legs look fine, no runny nose, no watery eyes, no swelling of face or waddle, eats probably the most out of all my 9 birds, and drinks plenty of water. poop seems fine as well. he has been in quarantine in my garage in a large cage with one of my Phoenix bantam hens (dosent lay anymore figured use her to test if contagious. she was also given the tylon but she has been in there for 2 weeks or more with no signs of sneezing or any sickness... any ideas... no other bird is sick either, i guess what im looking for is suggestions on what to do, is he sick...? i would just "cull" but he made it to national showing (didnt place but made it) and is used for studding. but i will do what i must to protect my flock but i have read many things on the subject... ultimately not looking to keep a sick bird around but maybe it's allergies or something non contagious. thoughts...?