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Which one of the following bacterial species can cause atypical pneumonia?

  • A.Chlamydia pneumoniae
  • B.Streptococcus pneumoniae
  • C.Klebsiella pneumoniae
  • D.Haemophilus influenzae

Answer: A

Atypical pneumonia is caused by Chlamydia pneumoniae.

'Atypical' pneumonia is the milder, walking pneumonia with a dry cough, patchy interstitial changes on X-ray and no response to beta-lactams. It is caused by organisms that lack a typical cell wall or live inside cells: Chlamydia (Chlamydophila) pneumoniae, Mycoplasma pneumoniae and Legionella.

Streptococcus pneumoniae, Klebsiella pneumoniae and Haemophilus influenzae cause typical bacterial (lobar or bronchial) pneumonia.

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