Ethan Rhodes
Hospitals are places where the sick go to get better, but they can also be a breeding ground for infections. In 2011, more than 720,000 hospital-acquired infections (HAIs) occurred in US hospitals, with about 22% occurring at surgical sites. The COVID-19 pandemic has also been associated with an increase in hospitalized critically ill individuals, who are at a higher risk of contracting HAIs. HAIs can be caused by contaminated surgical or medical equipment, such as catheters and respiratory ventilators, or even the hospital environment, such as waterborne pathogens in tap water, ice machines, and hospital water systems. Within hospitals, door handles, floors, laundry, and even dry-erase markers can be reservoirs of infection, as they are touched or used by many people and can spread infectious pathogens. In addition, healthcare workers and visitors can be potential vectors of infection, spreading diseases unknowingly as they move within and outside the hospital.
| Characteristics | Values |
|---|---|
| Definition of a reservoir of infection | The population of organisms or the specific environment in which an infectious pathogen naturally lives and reproduces, or upon which the pathogen primarily depends for its survival |
| Definition of a hospital reservoir of infection | Antibiotic-resistant organisms that establish reservoirs in new hospital built environments and are related to patient blood infection isolates |
| Examples of hospital reservoirs of infection | Waterborne pathogens, tap water, hospital water systems, Legionella, Pseudomonas aeruginosa, sink drains, door handles, floors, laundry and linens, dry-erase markers, personal protective equipment (PPE) |
| Examples of diseases that require quarantine | Cholera, diphtheria, infectious tuberculosis, Ebola, Marburg, avian influenza, Nipah virus |
| Strategies to prevent infection | Training and hygiene protocols, checklists for cleaning and maintaining patient rooms and common areas, stricter sanitisation procedures, use of chemical disinfectant sprays, removing antibiotic-resistant organism reservoirs |
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What You'll Learn
Hospital water systems
Hospitals and other healthcare facilities are often associated with infections caused by waterborne pathogens. A large healthcare-associated Legionella outbreak occurred at a Pennsylvania hospital, despite implementing a disinfection program with a copper-silver ionization system. This outbreak highlighted the presence of Legionella in hospital environmental samples, which was viable and transmissible even within the recommended range of copper and silver ion concentrations.
Various healthcare-associated infections have been linked to contaminated potable/tap water and hospital water systems, especially among immunocompromised and severely ill patients. Common pathogens include gram-negative bacilli and multidrug-resistant organisms such as Klebsiella, Enterobacter, Pseudomonas, and Acinetobacter. These pathogens can cause healthcare-associated infections, including pneumonia, urinary tract infections, and primary bloodstream infections.
NTM (nontuberculous mycobacteria) has also been identified as a cause of waterborne healthcare-associated outbreaks and infections. Different species of NTM have been found in various water sources within hospitals, including tap water, potable water, ice machines, heater-cooler units, hospital water systems, and showers. Mycobacterium mucogenicum, for example, has been associated with bathing and tub immersion, electronic faucets, sinks, and hospital water systems.
Healthcare-associated infections (HAIs) due to antibiotic-resistant organisms are a significant concern, especially in intensive care units (ICUs) where critically ill and immunocompromised patients are at elevated risk. Antibiotic-resistant organism burden is highest in hospital sink drains compared to other surfaces, with Pseudomonas aeruginosa being the most frequently cultured organism. Studies have shown that P. aeruginosa reservoirs in hospital environments can lead to infections and outbreaks.
To prevent and control infections in hospital water systems, it is crucial to implement effective infection prevention strategies. This includes regular cleaning and maintenance of water systems, ensuring proper disinfection, and monitoring for the presence of pathogens. Additionally, hospitals should have guidelines for identifying and managing potential reservoirs of infection within their facilities, including water systems.
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Human reservoirs
Reservoirs of infection refer to the populations of organisms or specific environments in which an infectious pathogen naturally lives, reproduces, and multiplies. Reservoirs can be human, animal, or environmental. Human reservoirs are human beings infected by pathogens that exist on or within the human body.
In healthcare settings, patients, visitors, healthcare providers, and facility staff may all be potential vectors of infection. Door handles, floors, laundry, and linens are common reservoirs of infection in hospitals, as they can harbour pathogens that are transmitted between individuals. Personal protective equipment (PPE) such as face masks and gloves can also become sources of infection if not properly disposed of or sanitised.
To prevent the spread of disease, individuals suspected or known to have been exposed to contagious pathogens may be quarantined or isolated. Hospitals often set up special wards with specific protocols and equipment to isolate patients with highly infectious diseases, such as tuberculosis or Ebola. Additionally, identifying the natural reservoirs of infectious pathogens is crucial for treating and preventing large outbreaks of disease, especially for diseases without vaccines. For example, the mass culling of animals suspected to be reservoirs for human pathogens has been effective in containing certain epidemics.
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Objects as reservoirs
Reservoirs of infection refer to the populations or environments in which an infectious pathogen naturally lives, reproduces, and is transmitted. Reservoirs can be human, animal, or environmental. Human reservoirs refer to individuals who are infected by pathogens but may be asymptomatic and unknowingly spread the disease. Asymptomatic individuals are less likely to take precautions to prevent transmission. Animal reservoirs are non-human and do not experience symptoms of the disease. Environmental reservoirs refer to external environments such as contaminated air or water.
In healthcare settings, objects and materials can act as reservoirs of infection. For example, door handles, floors, laundry, linens, and personal protective equipment (PPE) can all be sources of infection in hospitals. These objects can be contaminated by various individuals, including patients, visitors, healthcare providers, and facility staff, and can transmit pathogens to others who come into contact with them. Dry-erase markers, which are commonly found in patient rooms, can also be a source of infection as they are often overlooked during cleaning.
Healthcare-associated infections (HAIs) are a significant concern, with an estimated 2.5 million infections occurring annually worldwide. HAIs can be caused by contaminated surgical or medical equipment, such as catheters and respiratory ventilators. Waterborne pathogens, such as Legionella and various species of Mycobacterium, have also been linked to healthcare-associated infections, particularly among immunocompromised and severely ill patients.
To prevent the spread of infections in hospitals, it is crucial to identify and address these reservoirs of infection. This includes implementing comprehensive infection control policies, developing checklists for cleaning and maintaining patient rooms and common areas, and providing training on hygiene protocols for healthcare workers. Proper disposal and sanitation of PPE are also essential to prevent the spread of pathogens.
In some cases, hospitals may set up special wards to isolate patients with highly contagious diseases, such as tuberculosis or Ebola. These wards may have special air-handling methods and protocols, such as the use of personal protective equipment and chemical disinfectant sprays, to limit the risk of transmission.
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Hospital surfaces
Hospitals and healthcare facilities are reservoirs of infection as they can house different types of pathogens and microorganisms. Hospital surfaces, in particular, can be a source of infection, with sink drains found to have the highest burden of antibiotic-resistant organisms. Pseudomonas aeruginosa, for instance, has been frequently cultured from surfaces in intensive care units. Other surfaces, such as door handles, whiteboards, and dry-erase markers, can also be reservoirs of infection as they are frequently touched by multiple people.
In the context of infectious disease ecology, a natural reservoir refers to the population of organisms or the specific environment where an infectious pathogen naturally resides, reproduces, and depends for its survival. These reservoirs can be human, animal (non-human), or environmental. Human reservoirs are individuals infected by pathogens that exist on or within their bodies, who may or may not exhibit symptoms of the disease. Asymptomatic individuals often unknowingly spread illness as they do not take special precautions to prevent transmission.
To prevent hospitals from becoming reservoirs of infection, comprehensive infection control policies are necessary. This includes implementing checklists for cleaning and maintaining patient rooms and common areas. Strict sanitization procedures may be required for rooms occupied by patients with highly infectious diseases. Surfaces such as door handles should be wiped down with microfibre cloths that effectively remove microbes. Hospital staff should also pay attention to floors, spills, and laundry, as these can all contribute to the spread of pathogens if not properly cleaned and sanitized.
By understanding the potential sources of infection within hospitals and adhering to rigorous cleaning and sanitation protocols, the risk of healthcare-associated infections (HAIs) can be significantly reduced. HAIs pose a severe threat to critically ill and immunocompromised patients, and outbreaks of such infections have been linked to contaminated water sources and hospital water systems. Proper identification of hospital surfaces that act as reservoirs of infection is crucial in preventing the spread of infectious diseases.
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Isolation and quarantine
Hospitals are a unique environment, with a constant flow of people, equipment, and materials, all of which can be potential vectors of infection. The risk of infection is always present, and hospitals can indeed be considered reservoirs of infection.
When to Isolate or Quarantine
Implementation in Hospitals
Hospitals often have dedicated isolation wards for patients with highly contagious diseases. These wards may have special air-handling systems and protocols, such as the use of personal protective equipment (PPE) and chemical disinfectant sprays, to limit the risk of transmission. The duration of quarantine depends on factors like the incubation period of the disease and the presence of symptoms.
Preventing Transmission
To prevent the spread of infection within hospitals, it is essential to identify and understand the potential sources of infection, or reservoirs. These can include various surfaces and objects, such as door handles, floors, laundry, and medical equipment. Regular and thorough cleaning and sanitization are crucial, with specific procedures for different scenarios, such as spills of bodily fluids or when dealing with patients with highly infectious diseases.
Additionally, proper waste disposal is vital. This includes the correct disposal of PPE, which can become a source of infection if not handled appropriately.
By following strict isolation and quarantine procedures, hospitals can effectively reduce the risk of disease transmission and protect patients, staff, and visitors from infectious pathogens.
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Frequently asked questions
A reservoir of infection is any population of organisms or environment that harbours a pathogen and transmits it to another population. Reservoirs can be human, animal, or environmental.
Door handles, floors, laundry, linens, dry-erase markers, and personal protective equipment (PPE) are all potential reservoirs of infection in hospitals.
Hospitals implement infection control policies, such as training and hygiene protocols, checklists for cleaning and maintaining patient rooms and common areas, and special wards with air-handling methods and chemical disinfectant sprays for patients with highly infectious diseases.
Healthcare-associated infections (HAIs) are a global issue, with an estimated 2.5 million infections occurring annually. Examples of HAIs include surgical site infections, pneumonia, urinary tract infections, bloodstream infections, and waterborne pathogens such as Legionella and Mycobacterium.
The diverse nature of infectious pathogens and their hosts leads to multiple, sometimes conflicting, definitions and understandings of reservoirs. Additionally, reservoirs of certain diseases, such as Ebola and Marburg, remain unknown, hindering control efforts.
