• Cart

    0 items
    Your cart is empty.
    Knowledge

    Pseudomonas aeruginosa

    An adaptable environmental bacterium with major implications for water safety

    Pseudomonas aeruginosa is one of the most significant water-associated pathogens in healthcare settings. This gram-negative environmental bacterium occurs naturally in water, soil, and moist environments. In healthcare facilities, however, it can cause serious healthcare-associated infections (HAIs), particularly in immunocompromised and critically ill patients.

    What makes P. aeruginosa especially challenging is its combination of environmental adaptability, biofilm formation, and increasing antimicrobial resistance (AMR).

    Pseudomonas topics at a glance:

    Pseudomonas aeruginosa at a glance

    • Gram-negative, aerobic, rod-shaped bacterium
    • Naturally found in water and other moist environments
    • Forms persistent biofilms on wet surfaces
    • Important cause of healthcare-associated infections
    • Exhibits both intrinsic and acquired resistance mechanisms
    • Highly adaptable to a wide range of environmental conditions
    • Particularly relevant in ICUs and other high-risk healthcare settings

    What makes Pseudomonas aeruginosa so successful?

    Few environmental bacteria possess a comparable ability to persist in engineered water systems while also causing severe infections in humans.

    Key characteristics include:

    • Formation of resilient biofilms
    • Ability to survive in nutrient-poor water systems
    • High adaptability to changing environmental conditions
    • Considerable genetic variability
    • Multiple mechanisms of antibiotic resistance
    • Long-term persistence in water systems

    Where can Pseudomonas aeruginosa be found in hospitals?

    Moist environments provide favorable conditions for P. aeruginosa. Potential reservoirs include:

    • Faucets
    • Faucet aerators and outlets
    • Water supply lines
    • Showerheads and shower hoses
    • Sinks and basins
    • Drains and drainage systems
    • Other water-associated fixtures and systems

    Biofilms can develop both within the building water system and directly at points of use, where they may persist over long periods of time.

    Biofilms – a key survival advantage

    Biofilm formation is one of the defining characteristics of Pseudomonas aeruginosa.
    Within these protective microbial communities, bacteria can:

    • Establish persistent populations
    • Access nutrients
    • Multiply
    • Exchange genetic material
    • Increase their tolerance to environmental stressors

    As a result, bacteria embedded in biofilms can be considerably more difficult to control with disinfection, heat, and many antibiotics.

    Why is antibiotic resistance and antimicrobial resistance such a concern?

    Pseudomonas aeruginosa possesses numerous intrinsic and acquired resistance mechanisms.

    These include:

    • Efflux pumps
    • Porin modifications
    • Enzymes such as carbapenemases
    • Genetic adaptations under antibiotic pressure

    Together, these mechanisms can significantly limit treatment options and contribute to the growing clinical importance of multidrug-resistant and carbapenem-resistant strains.

    Which patients are particularly vulnerable?

    The risk is especially relevant in areas where patients with weakened immune defenses or other major risk factors receive care.

    These include:

    • Intensive care units (ICUs)
    • Neonatal intensive care units (NICUs)
    • Oncology units
    • Transplant units
    • Dialysis units
    • Burn units

    Even relatively low levels of exposure may pose a significant risk to highly vulnerable patients.

    What role does water play in transmission?

    Hospital water systems can serve as reservoirs for Pseudomonas aeruginosa.

    Potential transmission pathways include:

    • Contact with contaminated water through
      • Contaminated sink environments
      • Biofilms within water systems
      • Splash and microbially contaminated aerosols
      • Contaminated surfaces surrounding water fixtures

    International studies have repeatedly identified sinks and drainage systems in particular as potential reservoirs associated with healthcare outbreaks.

    Infection prevention starts at the point of use

    Effective infection prevention requires a combination of measures.

    These include:

    • Consistent hand hygiene
    • Surface and medical equipment disinfection
    • Appropriate reprocessing of medical devices
    • System-level measures within building water systems
    • Risk-based water hygiene strategies and safe water, sanitation, and proper hygiene programs (WASH)
    • Local protective measures at the point of use

    Particularly in high-risk areas, Point-of-Use and inline water filters can help reduce water-associated transmission pathways and provide an additional barrier to protect vulnerable patients.

    Your learning session on Pseudomonas aeruginosa

    How do waterborne pathogens spread from the biofilm into patient environment? What roles do biofilms, aerosols, splash zones, antibiotic resistance, and resistance mechanisms play? And why is Pseudomonas aeruginosa considered one of the most important water-associated pathogens in healthcare settings?

    Our new educational animation explores these connections in an accessible and clinically relevant way that is based on evidence.

    Zum Abspielen des Videos musst du den Marketing Cookies zustimmen:

    What you need to know about Pseudomonas aeruginosa and (healthcare) water hygiene
    References

    References and further reading

    Trautmann M, Halder S, Hoegel J, Royer H, Haller M. Point-of-use water filtration reduces endemic Pseudomonas aeruginosa infections on a surgical intensive care unit. Am J Infect Control. 2008 Aug;36(6):421-9. doi: 10.1016/j.ajic.2007.09.012 . PMID: 18675148.
    Reference Link

    Reynolds, D., Kollef, M. The Epidemiology and Pathogenesis and Treatment of Pseudomonas aeruginosa Infections: An Update. Drugs 81, 2117–2131 (2021). https://doi.org/10.1007/s40265-021-01635-6

    Proctor LL, Ward WL, Roggy CS, Koontz AG, Clark KM, Quinn AP, Schroeder M, Brooks AE, Small JM, Towne FD, et al. Potential Therapeutic Targets for Combination Antibody Therapy against Pseudomonas aeruginosa Infections. Antibiotics. 2021; 10(12):1530. https://doi.org/10.3390/antibiotics10121530

    Vorschlag der Deutschen Gesellschaft für Krankenhaushygiene (DGKH). Informationen durch den Wasserversorger an die Allgemeinbevölkerung bei Nachweis von Pseudomonas aeruginosa im zentralen Wasserversorgungsnetz. 25.04.2024. Reference Link

    JS – Online-Redaktion, Forum Verlag Herkert GmbH. Pseudomonas aeruginosa: Antibiotikaresistenz und Hygiene. 28.08.2024. Reference Link

    Xiao S, Liang X, Han L and Zhao S (2024) Incidence, antimicrobial resistance and mortality of Pseudomonas aeruginosa bloodstream infections among hospitalized patients in China: a retrospective observational multicenter cohort study from 2017 to 2021. Front. Public Health 11:1294141. doi: 10.3389/fpubh.2023.1294141

    Spagnolo AM, Sartini M, Cristina ML. Pseudomonas aeruginosa in the healthcare facility setting. Reviews in Medical Microbiology 32(3):p 169-175, July 2021. | DOI: 10.1097/MRM.0000000000000271 Reference Link

    Garvey M, Williams N, Gardiner A et al. The sink splash zone. Journal of Hospital Infection, 2023; 135, 154-156. Reference Link

    Pérez-Corrales C, Peralta-Barquero V, Mairena-Acuña C. Carriage of two carbapenem-resistance genes in Pseudomonas aeruginosa isolated from hospital-acquired infections in children from Costa Rica: the importance of local epidemiology. Antimicrob Resist Infect Control 10, 71 (2021). https://doi.org/10.1186/s13756-021-00942-7

    Becks VE, Lorenzoni NM. Pseudomonas aeruginosa outbreak in a neonatal intensive care unit: a possible link to contaminated hand lotion. Am J Infect Control. 1995 Dec;23(6):396-8. doi: 10.1016/0196-6553(95)90272-4. PMID: 8821117.

    Petkar HM, Caseres-Chiuco I, Al-Shaddad A, Mohamed M, Ahmed I, Rao R, Perdon R, Elhaj M, Latheef L, George B, Mustafa E, Al-Ajmi J, Saleh H. Outbreak of Pseudomonas aeruginosa on a neonatal intensive care unit: Lessons from a Qatari setting. J Infect Prev. 2024 Jul;25(4):103-109. doi: 10.1177/17571774241236248. Epub 2024 Feb 27. PMID: 39055679; PMCID: PMC11268246.

    Srinivasan A, Peterson A, Blossom D, Dassey DE. Outbreak of Pseudomonas aeruginosa in a Neonatal Intensive Care Unit — Los Angeles, California, 2006. 2007 October. Conference Paper. Reference Link

    Plecko V, Tripkovic V, Starcevic L, Varda Brkic D, Presecki Stanko A, Plesko S, Plavec D. Outbreak of Pseudomonas aeruginosa in a Neonatal Intensive Care Unit: Are Point-of-Use Filters Useful?. Signa Vitae. 2017. 13(1);75-79. Reference Link

    Bicking Kinsey C, Koirala S, Solomon B, Rosenberg J, Robinson BF, Neri A, Laufer Halpin A, Arduino MJ, Moulton-Meissner H, Noble-Wang J, Chea N, Gould CV. Pseudomonas aeruginosa Outbreak in a Neonatal Intensive Care Unit Attributed to Hospital Tap Water. Infect Control Hosp Epidemiol. 2017 Jul;38(7):801-808. doi: 10.1017/ice.2017.87. Epub 2017 May 18. PMID: 28516821.

    Molina-Cabrillana J, Artiles-Campelo F, Dorta-Hung E et al. Outbreak of Pseudomonas aeruginosa infections in a neonatal care unit associated with feeding bottles heaters. American Journal of Infection Control, 41, e7-e9. February 2013. Reference Link

    Terashita D, English L, Peterson A et al. An Outbreak of Pseudomonas Aeruginosa in the Neonatal Intensive Care Unit (NICU) and the Possible Role of Sensored Sinks. American Journal of Infection Control, 35, E134-E135. June 2007. Reference Link

    Aguilera-Sáez J, Andreu-Solà V, Larrosa Escartín N, Rodríguez Garrido V, Armadans Gil L, Sánchez García JM, Campins M, Baena Caparrós J, Barret JP. Extensively drug-resistant Pseudomonas Aeruginosa outbreak in a burn unit: management and solutions. Ann Burns Fire Disasters. 2019 Mar 31;32(1):47-55. PMID: 31285735; PMCID: PMC6588337.

    Ghanbarzadeh Corehtash Z, Khorshidi A, Firoozeh F, Akbari H, Mahmoudi Aznaveh A. Biofilm Formation and Virulence Factors Among Pseudomonas aeruginosa Isolated From Burn Patients. Jundishapur J Microbiol. 2015;8(10):e22345. doi: https://doi.org/10.5812/jjm.22345

    Thomas RE, Thomas BC. Reducing Biofilm Infections in Burn Patients’ Wounds and Biofilms on Surfaces in Hospitals, Medical Facilities and Medical Equipment to Improve Burn Care: A Systematic Review. International Journal of Environmental Research and Public Health. 2021; 18(24):13195. https://doi.org/10.3390/ijerph182413195

    El-Khashaab TH, Erfan DM, Ahmed Kamal A, El-Moussely LM, Kadry Ismail D. Pseudomonas Aeruginosa Biofilm Formation and Quorum Sensing lasR Gene in Patients with Wound Infection. January 2016. Egyptian Journal of Medical Microbiology Volume 25 / No. 1 / January 2016 101-108. Reference Link

    Deutsche Gesellschaft für Krankenhaushygiene e.V. (DGKH). Empfehlung zu Pseudomonas aeruginosa. 2016. Hyg Med 2016; 41 – Suppl. 2 DGKH. Reference Link

    Hüber I, Gerhardy K. Das DVGW-Arbeitsblatt W 551-4: Hygiene in der Trinkwasserinstallation – Teil 4: Verhütung, Erkennung und Bekämpfung von Kontaminationen mit Pseudomonas aeruginosa (03/2024). energie | wasser-praxis 11/2025. Reference Link

    Yui S, Karia K, Ali S, Muzslay M, Wilson P. Thermal disinfection at suboptimal temperature of Pseudomonas aeruginosa biofilm on copper pipe and shower hose materials. Journal of Hospital Infection, 2021; 117, 103-110. https://doi.org/10.1016/j.jhin.2021.08.016 Reference Link

    Yui S, Karia K, Ali S. Evaluation of novel disinfection methods for the remediation of heavily contaminated thermostatic mixing valves and water systems with Pseudomonas aeruginosa biofilm: considerations for new and existing healthcare water systems. Journal of Hospital Infection, 2024; 151, 195-200. https://doi.org/10.1016/j.jhin.2024.05.024 Reference Link

    Robinson RE, Goldberg JB. Mechanisms of thermoregulation in Pseudomonas aeruginosa. J Bacteriol. 2026 Apr 23;208(4):e0049525. doi: 10.1128/jb.00495-25. Epub 2026 Mar 11. PMID: 41810972; PMCID: PMC13104619.

    Ricker EB, Aljaafari HAS, Bader TM, Hundley BS, Nuxoll E. Thermal shock susceptibility and regrowth of Pseudomonas aeruginosa biofilms. Int J Hyperthermia. 2018 Mar;34(2):168-176. doi: 10.1080/02656736.2017.1347964. PMID: 294983124; PMCID: PMC6150600.