Which pathogen is often responsible for post-operative pneumonia?

Post-operative pneumonia is frequently associated with Pseudomonas aeruginosa, particularly in hospital settings where patients may have weakened immune systems. This pathogen is an opportunistic bacterium known for its ability to flourish in various environments, especially within healthcare facilities. Its mechanisms include biofilm formation and resistance to many antibiotics, making it a common culprit in infections after surgical procedures, especially in patients who have undergone thoracic or abdominal surgery.

While other pathogens like Streptococcus pneumoniae, Staphylococcus aureus, and Escherichia coli can also cause infections, they typically do not have the same prevalence in post-operative pneumonia within the context of surgical patients, especially in conditions where Pseudomonas is likely to be present, such as in ventilator-associated pneumonia or in patients with certain risk factors. The ability of Pseudomonas aeruginosa to resist common treatments further underscores its association with more severe post-operative respiratory infections.