Chickens: Treatment and prevention of chronic respiratory diseases (CRD) caused by Mycoplasma gallisepticum and Mycoplasma synoviae when the disease has been established in the flock. Treatment and prevention of necrotic enteritis caused by Clostridium perfringens when the disease has been established in the flock Turkeys: Treatment and prevention of infectious sinusitis caused by Mycoplasma gallisepticum. when the disease has been established in the flock.