That sounds like infectious bronchitis, which can spread through the whole flock causing sneezing often, and it is a virus that will not react to antibiotics. It makes the chicken a carrier for up to a year. So it is good not to add or hatch more chickens until next summer or fall. IB may be combined with another respiratory disease such as MG as well. Hopefully they will recover. How did the first girl do on the Tylosin?
