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Advancing the sciences, engineering & applications of ultraviolet technologies to enhance the quality of human life & to protect the environment.

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  • 19 Mar 2018 6:29 PM | Gary Cohen (Administrator)

    Imagine a world where healthcare-associated infections are just a concern of the past. It could happen, but unfortunately today that is not the case. Nation-wide, healthcare-associated infections (HAIs) infect one in every 25 hospital patients, account for more than 99,000 deaths and increase medical costs by more than $35B, each year. Ultraviolet-C (UV-C) antimicrobial devices are shown to reduce the incidence of many of these HAIs by 35% or more, through the deactivation of the pathogen’s DNA chain by irradiating it with a wavelength of ~254 nm. Recently, automated UV-C-emitting devices have been shown to decrease the bioburden of important pathogens in hospital rooms (Anderson et al., 2013). The irradiation effectively prevents the cells from multiplying. Such DNA damage can result in a permanent arrest of DNA replication and/or transcription, which leads to cell death (Friedberg, 2001). Clinical case reductions of 30-70% in Clostridium difficile (C. diff.) have been reported with similar results for methicillin-resistant Staphylococcus aureus (MRSA), and others. The methodology works. But, the adoption of UV-C technology by the healthcare industry has been sporadic, largely due to confusion, the lack of definitive knowledge and uniform performance standards or measures for efficacy to help healthcare managers make informed, credible investment decisions. Therefore, maintaining the status quo seems to be the most effective and safest investment approach. However, the leveling of the playing field with scientifically certifiable data of the efficacy of antimicrobial devices will enhance acceptance by the healthcare industry and public, at large, as well as facilitate science-based decision making.

    The International Ultra Violet Association (IUVA) and its member companies feel it is incumbent upon them to recognize this knowledge and metrology gap – and act. IUVA is also exploring ways to reduce these “wild” inharmonious market conditions, while developing science-based answers to the healthcare industry’s questions surrounding standards and measures of device disinfection efficacy, as well as reliability, operations and durability.

    The overall confusion stems from several reasons. The first and foremost is that there are more than 40 manufacturers of “ultraviolet (UV) sterilizers” producing products, which include all types of designs for: air, water and surface sterilization, and there are at least 12 manufacturers of at least that many antimicrobial devices. Depending upon the model and design the UV-C light sources, each can differ greatly in spectral bandwidth and power outputs. Instrument comparisons are difficult, if not impossible, and no standardized testing procedures are in place to compare or measure the performance of these devices.

    The lack of regulation and standards has also allowed each of the 40+ companies to develop their own unique testing and evaluation programs, often using different pathogens, concentrations, testing methodologies and more importantly efficacy criteria. The over abiding result is that there is no clear-cut means for comparison of one unit against another, thus often allowing cost to be the deciding factor for an administrator. But, is that the proper metric? Is advertising and marketing more important than independent-based research for the health of the patients? But, what of the patient’s needs? Clearly lawsuits have occurred between competing companies contesting various performance and operational claims. Past experience has shown that it is necessary to measure the proper performance parameters and justify these measurements with data and not just claims. This “wild-west” mentality in the healthcare market must be corralled so that the market can successfully grow, before something occurs that ruins the industry, for all involved.

    As stated above, the IUVA has begun an effort to develop answers to the healthcare industry’s questions surrounding standards and measures of device disinfection efficacy. Standards development activities have proven to have a pronounced effect on product development and the success of businesses in the marketplace. Implementing standards and science-based metrology to ensure product compliance, and other requirements for trade, have been met has been shown to streamline manufacturing processes and trim costs which then leads to increased market share and an improved bottom line.

    The development of UV light measurements and standards is critically needed to grow and expand UV technology in all phases of disinfection. Industry wide collaboration and cooperation is needed. The first step is to identify the main needs and then determine positive solutions. It is clear that consensus-based measurements and standards are needed in the UV technology sector; they are infrastructural and typically, if designed properly, pose no competitive advantage to one single company. Companies can openly and readily cooperate together at that level. Once the required solutions are identified to address the infrastructural measurement and standards needed, the solutions can be taken back “behind the curtain” and developed and applied to proprietary processes throughout the industry at the discretion of individual companies. This approach has been extremely successful for the semiconductor and other industries and can be readily applied to the UV industry.

    These issues were recently discussed at the IUVA 2018 America’s Conference in Redondo Beach, CA in several HAI panels. An output of the HAI panels was the formation of a formal IUVA Working Group for the Development of Antimicrobial Standards and Initiatives for the Healthcare Industry. The goal is to provide global guidance, with specific programs and deliverables, on the use of UV technologies and standards to combat HAIs and to further the stated aims of the IUVA on its outreach to the healthcare industry.

    The working group will develop a set of standards, guidelines and guidance documents related to healthcare applications that include standard methods for validating performance of UV devices and test guidelines for efficacy measurements, as well as discussing the development of a UV roadmap for overall healthcare to include outlines of issues, problems, potential solutions and needs for the future growth and success of the UV industry in healthcare application space.

    Fundamental change can be effected through a path of advancing UV efficacy standards and testing protocols to demonstrate UV’s advantages while advocating its increased implementation through education and outreach programs targeting the Nation’s healthcare sector.

  • 22 Feb 2018 6:32 PM | Gary Cohen (Administrator)


    Ultraviolet germicidal irradiation (UVGI) systems are gaining popularity, however objective comparisons of their characteristics are lacking. While environmental cultures and reduction of hospital-associated infections rates are excellent study endpoints, they are impractical for centers with limited resources who want to compare or optimize UVGI systems use.


    We evaluated radiometry and commercial test cards, two simple and low cost tools, to compare 2 full size UVGI systems (Tru-D and Optimum-UV Enlight) and 2 small units (Lumalier EDU 435 and MRSA-UV Turbo-UV).


    Radiometry-derived output curves show that if both large devices emit enough energy to reach C. difficile lethal doses at 10 ft, the reduction in output in distance is almost perfectly logarithmic. In a patient room environment, Enlight and Tru-D performed similarly when compared using radiometry and commercial test cards. The two small devices reached C. difficile range around the bathroom with the device raised above the floor, but longer times are needed.


    Despite different workflows and price points, no clear superiority emerges between Tru-D and Enlight. Bathroom disinfection should be dealt with separately from the main room and small, cheaper units can be used. Radiometry and commercial test cards are promising ways to compare UVGI systems, but further validation is needed using correlation with environmental cultures.

    The Full Report: Comparing and optimizing ultraviolet germicidal irradiation systems use for patient room terminal disinfection: an exploratory study using radiometry and commercial test cards

  • 01 Feb 2018 6:40 PM | Gary Cohen (Administrator)

    Vision: The United States will work domestically and internationally to prevent, detect, and control illness and death related to infections caused by antibiotic- resistant bacteria by implementing measures to mitigate the emergence and spread of antibiotic resistance and ensuring the continued availability of therapeutics for the treatment of bacterial infections.

    Read the full report >>

  • 01 Feb 2018 6:36 PM | Gary Cohen (Administrator)
    • Terminal disinfection with ultraviolet device in Clostridium difficile rooms.
    • Compliance improved from 20% to 100% during a 25 month study.
    • Audit and feedback utilized to drive compliance of ultraviolet disinfection.

    Touchless ultraviolet disinfection (UVD) devices effectively reduce the bioburden of epidemiologically relevant pathogens, including Clostridium difficile. During a 25-month implementation period, UVD devices were deployed facilitywide for the terminal disinfection of rooms that housed a patient who tested positive for C difficile. The deployment was performed with structured education, audit and feedback, and resulted in a multidisciplinary practice change that maximized the UVD capture rate from 20% to 100%.

    More information: Deployment of a touchless ultraviolet light robot for terminal room disinfection: The importance of audit and feedback

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