If you dont know if a, or which bacteria is the reason for this sneezing it's not good idea to give antibiotics imo.
Sometimes sneezing chickens heal without ab and sometimes sneezing chickens die with ab. And sometimes sneezing chickens cure with ab or die without ab.
Sometimes sneezing chickens heal without ab and sometimes sneezing chickens die with ab. And sometimes sneezing chickens cure with ab or die without ab.