Pneumonia is an infection that involves a complex set of steps, beginning with initial contact with a pathogenic microorganism and culminating in the invasion of the lower respiratory tract . This infection can be acquired in the community or within the hospital setting, and can be transmitted by aspirated or inhaled microorganisms.
Pneunomia is severe health problem and significant cause of mortality and morbidity worldwide. Pneumonia can be bacteria ,Viral, or Fungal (but most commonly bacterial). It is important to understand the role of the different pathogens in the microbial etiology of Pneumonia to effectively manage and guide appropriate antibiotic therapy.
this present will focus on bacterial pneumonia and will cover the most pathogenesis relevant information including important causes, pathogenesis, clinical manifestations and treatment.