Transmission-based precautions are infection-control precautions in health care, in addition to the so-called "standard precautions". They are the latest routine infection prevention and control practices applied for patients who are known or suspected to be infected or colonized with infectious agents, including certain epidemiologically important pathogens, which require additional control measures to effectively prevent transmission. Universal precautions are also important to address as far as transmission-based precautions. Universal precautions is the practice of treating all bodily fluids as if it is infected with HIV, HBV, or other blood borne pathogens. Transmission-based precautions build on the so-called "standard precautions" which institute common practices, such as hand hygiene, respiratory hygiene, personal protective equipment protocols, soiled equipment and injection handling, patient isolation controls and risk assessments to limit spread between patients.
History The following table shows the history of guidelines for transmission-based precautions in U.S. hospitals as of 2007:
Rationale for use in healthcare setting Communicable diseases occur as a result of the interaction between a source (or reservoir) of infectious agents, a mode of transmission for the agent, a susceptible host with a portal of entry receptive to the agent, the environment. The control of communicable diseases may involve changing one or more of these components, the first three of which are influenced by the environment. These diseases can have a wide range of effects, varying from silent infection – with no signs or symptoms – to severe illness and death. According to its nature, a certain infectious agent may demonstrate one or more following modes of transmission direct and indirect contact transmission, droplet transmission and airborne transmission. Transmission-based precautions are used when the route(s) of transmission is (are) not completely interrupted using "standard precautions" alone.
Standard precautions Standard precautions include:
Hand hygiene or hand washing to prevent oneself from contracting an illness or disease and prevent the spread of pathogens (e.g. bacteria, viruses, parasites) to other people, thus reducing the potential for transmission. Hand hygiene can be accomplished with different modalities including alcohol-based hand sanitizers, soap and water, or antiseptic hand wash. There are techniques and benefits to using one modality over another. Utilization of alcohol-based hand sanitizer is generally recommended when the hands are not visibly soiled or before and after contact with a person (e.g. patient in a healthcare setting), or object. With proper technique, soap and water are preferred for visibly soiled hands or in situations where hands various pathogens cannot be killed with alcohol-based hand sanitizers (e.g. spore-producing organisms like Clostridioides difficile). personal protective equipment (PPE) in cases of infectious material exposure etiquette, respiratory hygiene principles, patient isolation controls, soiled equipment handling, and injection handling.
Research Research studies in the form of randomized controlled trials and simulation studies are needed to determine the most effective types of personal protective equipment for preventing the transmission of infectious diseases to healthcare workers. There is low-quality evidence that supports making improvements or modifications to personal protective equipment to help decrease contamination. Examples of modifications include adding tabs to masks or gloves to ease removal and designing protective gowns so that gloves are removed at the same time. In addition, there is weak evidence that the following PPE approaches or techniques may lead to reduced contamination and improved compliance with PPE protocols: Wearing double gloves, following specific doffing (removal) procedures such as those from the CDC, and providing people with spoken instructions while removing PPE.
Definitions Three categories of transmission-based precautions have been designed with respect to the modes of transmission, namely Contact precautions, Droplet precautions, and Airborne precautions. For some diseases with multiple routes of transmission, more than one transmission-based precautions category may be used. When used either singly or in combination, they are always used in addition to standard precautions.
Contact precautions
Contact precautions are intended to prevent transmission of infectious agents, including epidemiologically important microorganisms, which are spread by direct or indirect contact with the patient or the patient's environment. The specific agents and circumstance for which contact precautions are indicated are found in Appendix A of the 2007 CDC Guidance. The application of contact precautions for patients infected or colonized with Multidrug-Resistant Organisms MDROs is described in the 2006 HICPAC/CDC MDRO guideline. Contact precautions also apply where the presence of excessive wound drainage, fecal incontinence, or other discharges from the body suggest an increased potential for extensive environmental contamination and risk of transmission. A single-patient room is preferred for patients who require contact precautions. When a single-patient room is not available, consultation with infection control personnel is recommended to assess the various risks associated with other patient placement options (e.g., cohorting, keeping the patient with an existing roommate). In multi-patient rooms, >3 feet spatial separation between beds is advised to reduce the opportunities for inadvertent sharing of items between the infected/colonized patient and other patients. Healthcare personnel caring for patients on contact precautions wear a gown and gloves for all interactions that may involve contact with the patient or potentially contaminated areas in the patient's environment. Donning PPE upon room entry and discarding before exiting the patient room is done to contain pathogens, especially those that have been implicated in transmission through environmental contamination (e.g., VRE, C. difficile, noroviruses and other intestinal tract pathogens; RSV)
Droplet precautions
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