a few weeks ago one of my old english game bantam rooster sneezed. I then hurried and separated him. He sneezed a few times. Then that was all. Then a week or so later he sneezed once, and then again a few days ago. He isn't constantly sneezing nor does it come in little spurts. can I just assume that dust is getting into his nose and making him sneeze? his food is very dusty, but I switched it and havent heard him sneeze since then. I have been very careful, when handeling him and then my other chickens, washing, chanigng clothes between etc. Is it safe to put him back with my other chickens?