The most common organisms which cause<unk>  are Streptococcus pneumoniae, also called pneumococcus, Haemophilus influenzae and Moraxella catarrhalis. Mycobacterium tuberculosis, the tubercle bacillus, may also cause<unk>  if pulmonary tuberculosis is not treated promptly. Other organisms that cause<unk>  are Legionella pneumophila and Klebsiella pneumoniae. Like other types of pneumonia,<unk>  can present as community acquired, in immune suppressed patients or as nosocomial infection. However, most causative organisms are of the community acquired type. Pathological specimens to be obtained for investigations include: # Sputum for culture, AAFBS and gram stain # Blood for full hemogram/complete blood count, ESR and other acute phase reactants # Procalcitonin test, more specific On a posteroanterior and lateral chest radiograph, an entire lobe will be radiopaque, which is indicative of<unk> . File:X-ray of<unk> .Chest radiograph of a<unk> , affecting the right middle lobe. File:CT of<unk> .CT scan of the same case. The identification of the infectious organism (or other cause) is an important part of modern treatment of pneumonia. The anatomical patterns of distribution can be associated with certain organisms, and can help in selection of an antibiotic while waiting for the pathogen to be cultured.
Lobar pneumonia
Atypical pneumonia
Lung abscess
Pleural empyema
Bronchitis kettle
Pleuropneumonia
Bacterial pneumonia
Fibrothorax