I have a flock of 26 eight week old straight run chicks. Tuesday I took my daily trip out to the run and noticed that one of my Buffs was wheezing and having labored breathing with every breath. I recorded a video...it was sad. The little chick was not sneezing but I decided to quarantine the chick anyways. So, off to the chicken hospital it went and off I went to Tractor Supply to purchase some Tylan-50. I figured that this was more than just an allergy and it came on super sudden! So I babied the chick in the house for a while (which was really cute....especially when it talked to me the entire time I was cooking dinner) giving it a chance to rest and have some peace. Chicken diapers are a must and fun to make! I administered .25ml (1/4 cc) of Tylan orally because I was not sure if I could give the little one a shot. I mean, I know I can give it a shot but was not confident in the size of the breast and didn't want to puncture anything if I went in too far. I will administer this dosage for 5 days. Today it still has a little wheezing but it isn't as loud. Today I went to check on the flock again and look for some serious signs of trouble. Did not notice anything at first until I came across another Buff that was breathing very heavily (no wheezing) and sneezed 4 times in two minutes. So, off to the chicken hospital it went with the same dosage administered as stated above. My other guy was so happy for a buddy. It cried for a while last night when it didn't have a friend to sleep with. So far I have not heard any sneezing and no one has runny eyes or watery noses. We keep pine shavings in their coop floor (deep liter method) which we changed as soon as we heard the first one wheezing. The roost has poop boards under neath and the poop boards are covered with sweet PDZ. Plenty of ventilation. But they don't sleep on their roosts yet. So my question is this: Should I treat the whole flock or play it by ear? I don't want to jump the gun but I also don't want to lose any of my little guys. P.S. I have heard the little one sneeze since I quickly administered the Tylan. P.P.S. it really pays to spend time daily with you flock and know how to look for these things. Thankful I have the time to do this.