Key result
Higher 279 nm UV-C LED doses were required to cause human norovirus surrogate reduction than 254 nm UV-C, while similar doses were needed for hepatitis A virus inactivation on Formica surfaces.
Why the study?
Traditional UV-C surface decontamination technologies use mercury lamps that pose safety and environmental hazards, prompting interest in UV-C LED systems.
Does UV-C LED (279 nm) inactivate HAV, FCV-F9, and TV on Formica coupons as effectively as traditional UV-C (254 nm)?
Does UV-C LED (279 nm) inactivate HAV, FCV-F9, and TV on Formica coupons as effectively as traditional UV-C (254 nm)?
Answers are grounded in this paper and cite their sources.
UV-C LED (279 nm) requires higher doses to inactivate human norovirus surrogates compared to traditional UV-C (254 nm), but is equally effective for hepatitis A virus on Formica surfaces.
Contaminated fomites can lead to hepatitis A virus (HAV) and human norovirus (HuNoV) disease outbreaks. Improved decontamination methods that are user-friendly, cost-effective, and waterless are being researched for sustainability. Traditional ultraviolet light (UV–C) technologies though effective for surface decontamination have drawbacks, using mercury lamps, that pose user-safety risk and environmental hazards. Therefore, UV-C light emitting diode (LED) systems are being designed for delivering required antiviral doses. The objective of this research was to determine the ability of UV-C LED (279 nm) systems to inactivate HuNoV surrogates, feline calicivirus (FCV–F9) and Tulane virus (TV), and HAV on Formica coupons in comparison to UV-C (254 nm) systems. FCV-F9 (∼6 log PFU/mL), TV (∼7 log PFU/mL), or HAV (∼6 log PFU/mL) at 100 μL were surface-spread on sterile Formica coupons (3 × 3 cm 2 ), air-dried, and treated for up to 2.5 min with both systems. Each experiment was replicated thrice. Recovered infectious plaque counts were statistically analyzed using mixed model analysis of variance. FCV-F9, TV, and HAV showed D 10 values of 23.37 ± 0.91 mJ/cm 2 , 16.32 ± 3.6 mJ/cm 2 , and 12.39 ± 0.70 mJ/cm 2 using 279 nm UV-C LED, respectively and D 10 values of 9.97 ± 2.44 mJ/cm 2 , 6.83 ± 1.13 mJ/cm 2 and 12.40 ± 1.15 mJ/cm 2 , respectively with 254 nm UV-C. Higher 279 nm UV-C LED doses were required to cause HuNoV surrogate reduction than 254 nm UV-C, except similar doses with both systems were needed for HAV inactivation on Formica surfaces. It remains critical to measure UV intensity of optical sources and optimize exposure times for desired log reduction on surfaces.
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Corson et al. (2024) studied Hepatitis A virus and human norovirus surrogates decontamination. UV-C LED (279 nm) system vs. UV-C (254 nm) system was evaluated on D10 values for viral inactivation. Higher 279 nm UV-C LED doses were required to cause human norovirus surrogate reduction than 254 nm UV-C, while similar doses were needed for hepatitis A virus inactivation on Formica surfaces.
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