Actinobacillus pleuropneumonia is a bacterium that primarily affects pigs, causing a serious respiratory disease known as porcine pleuropneumonia. This pathogen can lead to severe lung inflammation and is highly contagious among swine populations. Infected animals may show symptoms such as coughing, difficulty breathing, and fever. The disease caused by Actinobacillus pleuropneumonia can result in significant economic losses in the pig farming industry due to increased mortality rates and treatment costs. Vaccination and good management practices are essential for controlling outbreaks and protecting the health of affected herds.