Which bacteria are common etiological agents of hospital-acquired pneumonia (HAP)?

Updated: Sep 30, 2020
  • Author: Burke A Cunha, MD; Chief Editor: John L Brusch, MD, FACP  more...
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Common bacteria involved in hospital-acquired pneumonia (HAP) include the following: [9]

  • Staphylococcus aureus, including methicillin-susceptible S aureus (MSSA) and methicillin-resistant S aureus (MRSA)
  • Non-Enterobacteriaceae bacteria such as S marcescens, Stenotrophomonas maltophilia, and Acinetobacter species are less common causes

Acinetobacter species commonly colonize respiratory tract secretions in patients in the ICU. HAP caused by Acinetobacter species or B cepacia may be associated with outbreaks.

Streptococcus pneumoniae and Haemophilus influenzae are recovered only in early-onset HAP.

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