Actinobacillus pleuropneumonia in pigs is associated with what characteristic symptom?

Actinobacillus pleuropneumonia is a significant bacterial pathogen in pigs that primarily causes severe pleuropneumonia. One of the hallmark symptoms associated with this infection is a blood-tinged discharge from the nose, which is often described as bloody froth. This symptom arises due to the infection leading to severe lung inflammation and necrosis, which can result in hemorrhaging in the pulmonary tissues and subsequent respiratory distress.

The presence of bloody froth discharge is a particularly vivid and alarming clinical sign that indicates a more severe form of respiratory disease, often leading to rapid deterioration in affected animals. Early identification of such symptoms is crucial for effective management and treatment of the infection, as it can progress quickly to severe acute disease and potentially high mortality rates in pigs if not addressed promptly.

Other symptoms like chronic coughing, loss of appetite, and abdominal pain can be associated with various livestock diseases, but they lack the specificity and urgency of the bloody froth discharge linked to Actinobacillus pleuropneumonia.