We bought 15 chicks in mid-March that we raised in a brooder. A salmon faverolle had a bubbly eye on and off since we got her but none of the other chicks ever showed symptoms. I washed her eye out and it would subside for days or longer. Now that they are outside, I heard her sneeze the other day so started her on 1/4 cc (only 2.5 months old) of Tylan50 injectable for 5 days. No symptoms during treatment and none of the coop mates have shown any symptoms. Yesterday was day 6 so no Tylan50 and this am her eye is bubbly again. What next?