Pulmonary infections refer to infections that affect the respiratory system, specifically the lungs. Common types of pulmonary infections include pneumonia, bronchitis, tuberculosis, and influenza. These infections can be caused by viruses, bacteria, fungi, or parasites, and can result in symptoms such as coughing, chest pain, fever, and difficulty breathing. Pulmonary infections can range in severity from mild to life-threatening and require prompt diagnosis and treatment to prevent complications. Researchers in this area study the causes, risk factors, prevention, and treatment of pulmonary infections to improve patient outcomes and reduce the burden of these infections on public health.