How long does the norovirus live on surfaces
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Norovirus Persistence on Surfaces: Duration and Implications
Norovirus Longevity on Various Surfaces
Hard Surfaces: Stainless Steel, Plastic, and Ceramic
Norovirus can persist on hard surfaces such as stainless steel, plastic, and ceramic for extended periods. Studies have shown that norovirus can remain viable on these surfaces for up to 42 days, with only a 1.5 to 2.3 log reduction in viral concentration over this period . Another study found that norovirus and its surrogates, feline calicivirus (FCV) and murine norovirus (MNV), could be detected on stainless steel and plastic for up to 70 days, with a significant reduction in viral titers over time .
Soft Surfaces: Carpets and Upholstered Furniture
Norovirus also shows resilience on soft surfaces like carpets. Research indicates that norovirus surrogates can survive on carpet fibers for up to 60 days, with survival rates varying based on the type of carpet and relative humidity . Wool carpets, in particular, provided a more hospitable environment for the virus compared to nylon carpets.
Commonly Touched Surfaces: Keyboards, Telephones, and Faucets
On frequently touched surfaces such as computer keyboards, telephone buttons, and faucets, norovirus can survive for varying durations. FCV, a surrogate for norovirus, was found to survive up to 3 days on telephone buttons and receivers, 1 to 2 days on computer mice, and 8 to 12 hours on keyboard keys and brass surfaces .
Food Contact Surfaces
Norovirus can also persist on food contact surfaces, posing a significant risk during food preparation and handling. The virus has been shown to remain viable on surfaces like Formica, stainless steel, and polyvinyl chloride for up to 2 weeks, with less than a 1-log reduction in viral concentration .
Factors Influencing Norovirus Survival
Temperature and Humidity
Temperature and humidity significantly affect norovirus survival. At room temperature, norovirus can persist on surfaces for several weeks, while lower temperatures (e.g., 7°C) enhance its stability, allowing it to remain viable for even longer periods . Relative humidity also plays a role, with lower humidity levels (30%) providing a more favorable environment for viral survival on carpets compared to higher humidity levels (70%) .
Organic Load
The presence of organic material, such as simulated gastric fluid, can enhance norovirus stability on surfaces. In an airplane cabin study, norovirus was detected at high titers for up to 30 days when an organic load was present, indicating that organic matter can protect the virus from environmental degradation and disinfection efforts .
Implications for Public Health and Hygiene
Disinfection Challenges
Norovirus's resilience on various surfaces underscores the challenges in effectively disinfecting contaminated areas. Common disinfectants, including hydrogen peroxide and ethanol-based solutions, are often ineffective against norovirus at standard concentrations . This necessitates the use of more potent disinfectants like chlorine-based solutions or high hydrostatic pressure treatments for effective inactivation.
Hygiene Practices
Given norovirus's persistence on surfaces, rigorous hygiene practices are essential to prevent its spread. Regular cleaning and disinfection of high-touch surfaces, thorough washing of hands and produce, and the use of effective disinfectants are critical measures. In institutional settings like hospitals and nursing homes, frequent cleaning of fomites such as telephones, computer keyboards, and faucets is particularly important to mitigate the risk of transmission .
Conclusion
Norovirus can survive on a variety of surfaces for extended periods, with its persistence influenced by factors such as surface type, temperature, humidity, and the presence of organic material. This resilience poses significant challenges for disinfection and highlights the importance of stringent hygiene practices to prevent outbreaks. Understanding the environmental stability of norovirus is crucial for developing effective control measures and reducing the public health burden of this highly contagious virus.
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