Are the terms "hospital-acquired pneumonia" (HAP) and "nosocomial pneumonia" no longer acceptable?

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Last updated: March 15, 2026 • View editorial policy

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Terminology Status: Hospital-Acquired and Nosocomial Pneumonia

Both terms "hospital-acquired pneumonia" (HAP) and "nosocomial pneumonia" remain fully acceptable and are actively used interchangeably in current international guidelines and clinical practice. 1

Current Terminology Standards

The most recent major international guidelines from 2017 (European Respiratory Society/ESICM/ESCMID/ALAT) explicitly define and use both terms without any indication of deprecation:

  • "Hospital-acquired pneumonia (HAP)" is defined as infection of the pulmonary parenchyma caused by pathogens present in hospital settings 1
  • "Nosocomial pneumonia" is used synonymously, referring to pneumonia developing in patients admitted to hospital for >48 hours 1
  • The guidelines state that "among nosocomial pneumonias, ventilator-associated pneumonia (VAP) develops in ICU patients," clearly using nosocomial as an umbrella term 1

What Actually Changed: Healthcare-Associated Pneumonia (HCAP)

The term that has been abandoned is "healthcare-associated pneumonia" (HCAP), not HAP or nosocomial pneumonia. 2

The 2016 IDSA/ATS guidelines explicitly removed HCAP from their recommendations because:

  • Growing evidence demonstrated that many patients defined as having HCAP were not actually at high risk for multidrug-resistant pathogens 2
  • The HCAP designation led to inappropriate broad-spectrum antibiotic overuse 2
  • Risk stratification should be based on validated risk factors for MDR pathogens, not solely on healthcare system contacts 2

Current Clinical Framework

The accepted classification system includes: 1, 3, 2

  • Hospital-acquired pneumonia (HAP): Pneumonia occurring ≥48 hours after hospital admission, not incubating at admission
  • Ventilator-associated pneumonia (VAP): Pneumonia occurring >48 hours after endotracheal intubation
  • Community-acquired pneumonia (CAP): Pneumonia acquired outside healthcare settings

Common Pitfall to Avoid

Do not confuse the abandonment of HCAP with any change in HAP/nosocomial pneumonia terminology. Recent literature from 2023-2025 continues to use both "hospital-acquired pneumonia" and "nosocomial pneumonia" without restriction. 4, 5, 6, 7 The 2017 European guidelines, which represent the most comprehensive international consensus, use both terms throughout their entire document interchangeably. 1

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.