Types of Bacterial Pneumonia

There are many different types of pneumonia, including those that are caused by bacteria and viruses. Healthcare providers separate bacterial pneumonia into different types, based on where the infection occurred. For example, if you get pneumonia while in the hospital, it is known as hospital-acquired pneumonia.
 
The types of bacteria that can cause pneumonia in a hospital setting include:
 
  • Gram-negative bacteria, such as Escherichia coli, Klebsiella pneumoniae, Enterobacter species, Pseudomonas aeruginosa, and Acinetobacter species
  • Staphylococcus aureus, including methicillin-resistant S. aureus (MRSA)
  • Streptococcus species.
     
Many people get pneumonia outside of the hospital (this is known as community-acquired pneumonia). The types of bacteria most likely to result in this illness include:
 
  • Streptococcus pneumoniae, also known as just pneumococcus (the most common cause of pneumonia worldwide)
  • Mycoplasma pneumoniae
  • Haemophilus influenzae
  • Chlamydophila pneumoniae
  • Legionella pneumophila.
     
(Click Causes of Pneumonia or Types of Pneumonia for more detailed information on the different forms of pneumonia and what causes them, including a description of the different viruses and fungi responsible for infection.)
 
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