**4.5 Chronic suppurative pulmonary disease**

Chronic lung suppurative disease develops due to unsuccessful treatment or incomplete recovery from previous lung attacks. The outbreak of bacterial infection in the lungs is often associated with a stressful event such as transport, sale, or the most common. Salmonellosis, especially *Salmonella* infection (*Salmonella Dublin* infection), and Johne's disease are other examples of postnatal reinfection.
