![]() ![]() Runny nose (either direct bacterial pneumonia or accompanied by primary viral pneumonia). ![]() The term "atypical" does not relate to how commonly these organisms cause pneumonia, how well it responds to common antibiotics or how typical the symptoms are it refers instead to the fact that these organisms have atypical or absent cell wall structures and do not take up Gram stain in the same manner as gram-negative and gram-positive organisms. Atypical Ītypical bacteria causing pneumonia are Coxiella burnetii, Chlamydophila pneumoniae ( J16.0), Mycoplasma pneumoniae ( J15.7), and Legionella pneumophila. Pneumonia caused by Yersinia pestis is usually called pneumonic plague. These bacteria often live in the gut and enter the lungs when contents of the gut (such as vomit or faeces) are inhaled. Gram-negative bacteria are seen less frequently: Haemophilus influenzae ( J14), Klebsiella pneumoniae ( J15.0), Escherichia coli ( J15.5), Pseudomonas aeruginosa ( J15.1), Bordetella pertussis, and Moraxella catarrhalis are the most common. Other important Gram-positive causes of pneumonia are Staphylococcus aureus ( J15.2) and Bacillus anthracis. Streptococcus pneumoniae is a Gram-positive bacterium that often lives in the throat of people who do not have pneumonia. Streptococcus pneumoniae ( J13) is the most common bacterial cause of pneumonia in all age groups except newborn infants. 3D medical animation still showing Streptococcus pneumoniae bacteria (causative bacteria of much bacterial pneumonia and meningitis).īacterial pneumonia is a type of pneumonia caused by bacterial infection.
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