Erythro-35 is indicated for the treatment of Chronic Respiratory Disease (CRD) caused by Mycoplasma infections, and for the treatment of infectious (respiratory) diseases due to erythromycin-sensitive bacteria such as Staphylococcus aureus (e.g. infectious arthritis), Haemophilus paragallinarum (e.g. infectious coryza) and Pasteurella multocida (e.g. pasteurellosis; pneumonia) in poultry.