Emergency! Hen struggling to breathe!
Respiratory infections such as MG, coryza, infectious bronchitis, and ILT can have symptoms that look similar to one another. Those can be complicated by secondary infections which include those same diseases in addition to E.coli and other bacteria. Air sacculitis which is an infection of the many air sacs which can spread infection all over the body is what usually kills chickens from respiratory diseases.The lungs in chickens are usually not as important as the air sacs. Infectious bronchitis and ILT are viruses which don't to antibiotics, while the others are bacteria or mycoplasmas that will respond to antibiotics such as Tylan, tetracyclines, or Baytril.