Application of UV-C Technology in Managing the Monkeypox Epidemic: Surface, Air, and PPE Decontamination

The outbreak of monkeypox, a zoonotic viral disease, necessitates effective strategies for infection control and decontamination. Ultraviolet-C (UV-C) radiation, with its germicidal properties, has long been utilized for sterilization in various settings. This paper explores the potential of UV-C technology in managing the monkeypox epidemic, focusing on its applications for surface, air, and Personal Protective Equipment (PPE) decontamination. Traditional UV-C methods have demonstrated effectiveness in reducing viral loads on surfaces and in the air, potentially mitigating the spread of monkeypox. Additionally, UV-C can aid in the sterilization of PPE, crucial for protecting healthcare workers and managing supply shortages. The paper also addresses environmental considerations, including the energy consumption and water footprint associated with UV-C systems. The transition to energy-efficient UV-C LEDs and sustainable practices is highlighted as a means to balance efficacy with environmental impact. By integrating UV-C technology with other infection control measures, healthcare facilities and high-risk environments can enhance their response to the monkeypox epidemic while minimizing ecological concerns.

Monkeypox, a zoonotic viral disease caused by the Monkeypox Virus (MPXV), has recently emerged as a significant public health threat. Although monkeypox was first identified in humans in the 1970s, its resurgence in 2022 raised global concerns due to its rapid spread across regions outside of its historically endemic areas, primarily Central and West Africa. The disease shares clinical similarities with smallpox, including fever, rash, and swollen lymph nodes, but it typically presents with lower mortality rates. Despite these differences, the transmission pathways of monkeypox—direct contact with infectious lesions, body fluids, respiratory droplets, and contaminated surfaces—make it a disease with considerable epidemic potential. As of late 2023, monkeypox has been declared a public health emergency in multiple countries, leading to increased efforts in infection prevention and control. Unlike COVID-19, monkeypox is less likely to spread via respiratory aerosols over long distances. However, direct contact with contaminated surfaces and objects (fomites) plays a critical role in transmission, particularly in healthcare settings and communal environments where individuals interact with shared surfaces. The virus can remain viable on surfaces such as bed linens, medical equipment, and Personal Protective Equipment (PPE), emphasizing the need for effective decontamination strategies. The global response to the monkeypox outbreak has focused on several key areas, including vaccination, contact tracing, isolation of infected individuals, and enhanced hygiene practices. Decontamination methods, particularly in high-risk environments like hospitals, public transportation, and community centers, are crucial to prevent further spread of the virus. However, the recent resurgence of monkeypox has revealed significant gaps in available decontamination technologies that can be applied at scale, particularly in resource-limited settings. Traditional chemical disinfectants, while effective, can be costly, labor-intensive, and pose environmental challenges such as chemical runoff and water consumption [1-3].

In light of these challenges, Ultraviolet-C (UV-C) technology has gained attention as a promising non-chemical alternative for viral disinfection. UV-C light, which operates within the 200–280 nm wavelength range, has long been known for its germicidal properties. Its effectiveness against a wide range of pathogens, including bacteria, fungi, and viruses, has made it a staple in sterilization protocols in healthcare and industrial settings. The potential to apply UV-C technology for decontaminating surfaces, purifying air, and sterilizing PPE is especially relevant in the context of the monkeypox epidemic, where preventing fomite transmission is paramount. The current status of the epidemic underscores the urgent need for scalable, environmentally sustainable decontamination methods. UV-C technology offers a solution that can be rapidly deployed across various settings. In healthcare environments, UV-C systems can be used to disinfect patient rooms, surgical areas, and high-touch surfaces without the need for manual application of chemical disinfectants. Additionally, UV-C air purification systems can reduce airborne viral particles in enclosed spaces, providing an extra layer of protection in hospitals, clinics, and communal living areas. Lastly, the use of UV-C for sterilizing PPE offers a critical advantage in maintaining supply chains during outbreaks when shortages of disposable protective gear are likely to occur [1-6].

Ultraviolet-C (UV-C) radiation, encompassing wavelengths between 200 and 280 nm, has been a cornerstone in disinfection technologies due to its potent germicidal properties. UV-C is a type of ultraviolet light that falls within the most energetic portion of the UV spectrum, making it highly effective at inactivating a broad range of microorganisms, including bacteria, viruses, and fungi. The efficacy of UV-C radiation lies in its ability to penetrate the cell walls of microorganisms and disrupt their genetic material, specifically by inducing the formation of pyrimidine dimers in DNA and RNA. These dimers prevent the microorganisms from replicating and transcribing, ultimately leading to their inactivation or death [7,8].

Historically, UV-C radiation has found widespread use in various sterilization and decontamination processes, particularly within healthcare settings. The use of UV-C technology in hospitals, laboratories, and other medical environments has been instrumental in reducing the spread of infectious agents. For example, UV-C systems have been deployed to disinfect air, water, and surfaces, significantly lowering the risk of Healthcare-Associated Infections (HAIs). The technology's non-chemical nature and ability to rapidly and effectively sanitize large areas make it an attractive option for environments where maintaining sterility is crucial [9-12].

The ongoing monkeypox epidemic has brought renewed attention to UV-C technology as a potential preventive measure against viral transmission. Monkeypox, a zoonotic disease caused by the monkeypox virus, has seen a resurgence, prompting public health authorities to seek effective strategies for controlling its spread. Given the virus's transmission pathways—which include direct contact with infectious lesions, bodily fluids, and respiratory droplets—there is a pressing need for efficient and scalable decontamination methods. UV-C radiation, with its established track record in pathogen inactivation, presents a compelling option for mitigating the transmission of monkeypox in both healthcare and community settings [13-16]. There has always been epidemics and pandemics that effect the world. The summary of the pandemics with their impacts is given in table 1.

In healthcare environments, UV-C has been widely employed for sterilizing medical instruments, disinfecting surfaces, and purifying air. These applications are based on the principle that UV-C light can effectively inactivate pathogens on surfaces and in the air, thereby reducing the likelihood of transmission. For instance, in hospital settings, UV-C light has been used to disinfect patient rooms, operating theaters, and high-touch surfaces such as doorknobs, bed rails, and medical equipment. The technology is also used in air purification systems to reduce airborne pathogens in environments where vulnerable populations, such as immunocompromised patients, are present [10,17-20].

In the context of the monkeypox epidemic, these traditional applications of UV-C technology are highly relevant. Monkeypox is primarily transmitted through direct contact with infectious material, but there is also a potential for transmission via contaminated surfaces (fomites) and, to a lesser extent, through respiratory droplets. Therefore, the ability of UV-C radiation to disinfect surfaces and purify air is of particular importance in preventing the spread of the virus in settings such as hospitals, clinics, and other healthcare facilities. One of the most significant advantages of UV-C technology is its ability to rapidly disinfect surfaces without the need for harsh chemicals. This is particularly important in healthcare settings, where the use of chemical disinfectants can pose risks to both patients and healthcare workers, especially in enclosed spaces. UV-C systems can be deployed quickly and can disinfect large areas in a short amount of time, making them ideal for use in emergency situations or in environments where rapid decontamination is required [13,14,21,22].

Moreover, UV-C technology can be used to disinfect Personal Protective Equipment (PPE), such as masks, gowns, and gloves, which are critical for protecting healthcare workers from infection. During the COVID-19 pandemic, UV-C has been used extensively to decontaminate N95 masks, allowing for their safe reuse in situations where PPE shortages were a concern. In the context of monkeypox, similar strategies could be employed to ensure that healthcare workers have access to sufficient PPE, particularly in outbreak settings where demand may exceed supply [23-25].

Another key application of UV-C technology in the fight against monkeypox is in air disinfection. While monkeypox is less likely to be transmitted via airborne particles compared to respiratory viruses like SARS-CoV-2, there is still a potential risk, particularly in settings where patients are in close proximity, such as in hospital wards or crowded public spaces. UV-C air purification systems can be used to reduce the concentration of airborne pathogens, thereby lowering the risk of transmission in these environments. These systems are particularly useful in areas with high patient turnover or in locations where ventilation is limited [13,24-26].

Despite the many advantages of UV-C technology, there are also challenges and limitations that must be considered when applying it to the current monkeypox epidemic. One of the primary challenges is ensuring that UV-C radiation reaches all surfaces and areas that need to be disinfected. UV-C light is line-of-sight, meaning it cannot penetrate shadows or reach areas that are obstructed. This limitation can be mitigated through careful placement of UV-C devices and by using multiple light sources to ensure comprehensive coverage [15,17,27].

Additionally, there are safety concerns associated with the use of UV-C radiation, particularly regarding human exposure. Direct exposure to UV-C light can cause skin burns and eye injuries, so it is essential to implement safety protocols to protect healthcare workers and others who may be in the vicinity of UV-C devices. These protocols might include the use of automated UV-C systems that operate in unoccupied rooms or the implementation of time delays to ensure that areas are clear before UV-C devices are activated [28-31].

In conclusion, the traditional applications of UV-C technology offer a promising toolset for managing the current monkeypox epidemic. By leveraging UV-C for surface, air, and PPE decontamination, healthcare facilities and other high-risk environments can reduce the spread of the monkeypox virus. However, to maximize the effectiveness of UV-C decontamination in this context, it is crucial to address the challenges of ensuring adequate exposure and safety while adapting the technology to meet the specific needs of combating the spread of monkeypox. This paper focuses on the traditional applications of UV-C decontamination, particularly within healthcare settings, and evaluates their potential relevance and effectiveness in the context of the monkeypox epidemic. The primary focus is on how these traditional uses can be adapted or expanded to address the unique challenges posed by monkeypox, especially in environments where the risk of viral transmission is high. This study focuses on evaluating the potential of UV-C technology to manage the spread of monkeypox by reviewing its traditional applications in healthcare and its adaptability to current epidemic needs. By understanding both the benefits and challenges of UV-C decontamination, we aim to assess its role in enhancing infection control efforts during this public health crisis.

Ultraviolet-C (UV-C) technology utilizes light in the 200 to 280 nm wavelength range, known for its powerful germicidal properties. This section provides a comprehensive overview of UV-C technology, its mechanisms, traditional applications, and the emerging interest in using it to combat modern viral epidemics, such as monkeypox.

UV-C radiation works by disrupting the DNA and RNA of microorganisms, rendering them unable to replicate and infect. When microorganisms are exposed to UV-C light, the energy from the radiation causes the formation of pyrimidine dimers—particularly thymine dimers—within their genetic material. These dimers distort the DNA structure, hindering the replication process and leading to cell death or inactivation. This mechanism makes UV-C effective against a wide range of pathogens, including bacteria, viruses, and fungi [15,32].

Traditionally, UV-C technology has been employed across various sectors, most notably in healthcare, water treatment, and air purification.

• Healthcare: In medical settings, UV-C is used for sterilizing surgical instruments, disinfecting surfaces, and purifying air. Hospitals commonly deploy UV-C systems in patient rooms, operating theaters, and laboratories to reduce the risk of Healthcare-Associated Infections (HAIs). UV-C is also used to decontaminate Personal Protective Equipment (PPE), allowing for safe reuse, which became particularly important during the COVID-19 pandemic.
• Water Treatment: UV-C technology is widely used in water treatment facilities to eliminate pathogens from drinking water, wastewater, and industrial process water. The non-chemical nature of UV-C disinfection is advantageous as it avoids the introduction of harmful by-products, making it a safe and environmentally friendly option.
• Air Purification: UV-C is employed in HVAC systems to reduce airborne pathogens, thereby improving indoor air quality. This application is particularly useful in environments such as hospitals, schools, and office buildings, where controlling the spread of airborne diseases is critical [10,32-34].

With the resurgence of viral diseases like monkeypox, there is growing interest in applying UV-C technology as a preventive measure. Monkeypox, which spreads through direct contact with infected individuals, contaminated surfaces, and respiratory droplets, poses significant challenges for public health. UV-C technology offers a potential solution to mitigate the spread of the virus in various settings.

• Surface Decontamination: Given that monkeypox can be transmitted via contaminated surfaces (fomites), UV-C’s ability to disinfect surfaces quickly and effectively is of particular importance. This application can be critical in healthcare settings, public transportation, and communal areas where high-touch surfaces are common.
• Air Disinfection: Although monkeypox is less likely to be transmitted through airborne particles than respiratory viruses, there remains a risk, particularly in crowded or poorly ventilated spaces. UV-C air purification systems can reduce the concentration of airborne pathogens, lowering the risk of transmission in such environments.
• PPE Decontamination: UV-C’s application in decontaminating PPE ensures that healthcare workers and others on the frontlines of the epidemic have access to clean, safe protective gear. This is especially crucial in outbreak situations where PPE supplies may be limited [10,32-34].

Monkeypox, a zoonotic viral disease caused by the monkeypox virus, has emerged as a significant public health concern. Characterized by symptoms similar to smallpox, such as fever, rash, and swollen lymph nodes, monkeypox is primarily transmitted through direct contact with infectious lesions, body fluids, and respiratory droplets. The virus can also be spread via contaminated surfaces, highlighting the need for effective decontamination measures to control outbreaks. In this context, Ultraviolet-C (UV-C) technology presents a valuable tool for mitigating the spread of monkeypox. This section explores how UV-C decontamination can be applied to address various transmission pathways of the virus [11,15,35-37].

Surface decontamination

The monkeypox virus can persist on surfaces for varying durations, depending on environmental conditions. Studies have shown that the virus remains viable on surfaces such as plastics, metals, and fabrics, which underscores the importance of effective surface disinfection strategies. UV-C decontamination is well-suited for this purpose. UV-C light, with its germicidal properties, can effectively inactivate the monkeypox virus on surfaces, including those found in healthcare settings, communal spaces, and transportation vehicles. In healthcare environments, where the risk of fomite transmission is high, UV-C technology can be employed to disinfect patient rooms, waiting areas, and other high-touch surfaces. For example, UV-C light can be used to clean hospital beds, doorknobs, and other frequently touched items. Similarly, in communal spaces such as public transportation or shared facilities, UV-C systems can help reduce the risk of surface-borne transmission by ensuring that surfaces are free from viable viral particles. This approach not only minimizes the potential for cross-contamination but also enhances overall hygiene and safety [38-42].

Airborne transmission control

Although monkeypox is primarily transmitted through direct contact and not via airborne particles, there is still a potential risk of airborne transmission, particularly in environments with high patient turnover or where respiratory symptoms are common. UV-C air purification systems can play a role in controlling this risk by targeting airborne viral particles. UV-C air purification systems work by circulating air through UV-C lamps, which expose the air to germicidal UV-C light. This process can effectively inactivate viral particles present in aerosols, thereby reducing the risk of airborne transmission. In settings such as hospitals or clinics where patients with respiratory symptoms may be present, integrating UV-C air purifiers can help lower the concentration of airborne pathogens and improve overall air quality. By addressing the potential for airborne transmission, UV-C systems contribute to a comprehensive infection control strategy [24,41-43].

Personal protective equipment and textile sterilization

In the fight against infectious diseases, Personal Protective Equipment (PPE) such as masks, gowns, gloves, and other textiles plays a vital role in safeguarding healthcare workers and mitigating the spread of pathogens. The use of UV-C technology for the sterilization of PPE and textiles represents a valuable strategy in maintaining hygiene and ensuring the availability of critical protective gear during outbreaks. With the current monkeypox epidemic, UV-C decontamination of PPE and textiles is particularly relevant and beneficial [5,17,19,39,40].

UV-C technology has long been employed to disinfect and sterilize PPE items, including masks, gowns, and gloves. These items often come into direct contact with infected patients, making them potential vectors for the transmission of the monkeypox virus. By using UV-C light to treat these surfaces, healthcare facilities can effectively neutralize viral particles, thus preventing cross-contamination and safeguarding both patients and healthcare providers. The application of UV-C for PPE sterilization involves exposing contaminated items to UV-C light, which damages the DNA or RNA of pathogens, including viruses. For textiles such as bed sheets, surgical drapes, and uniforms, UV-C technology can be equally effective. These textiles, frequently used in healthcare settings, may harbor viral particles and contribute to the spread of the virus if not properly sanitized. UV-C decontamination ensures that these items are free from infectious agents before reuse, thus maintaining a sterile environment [39,41,42].

Several studies have demonstrated the efficacy of UV-C technology in inactivating various pathogens, including viruses similar to the monkeypox virus. This effectiveness extends to textiles used in healthcare settings. For instance, UV-C sterilization systems can be integrated into laundry facilities or dedicated decontamination chambers to treat bed linens and other fabrics. This approach not only helps manage supply shortages by allowing for the safe reuse of textiles but also enhances the overall safety of healthcare environments. Moreover, UV-C technology can contribute to broader infection control strategies beyond just PPE. By decontaminating textiles and surfaces, UV-C systems can help reduce the environmental footprint of disposable protective gear and lessen the strain on healthcare supply chains. This is especially important during large-scale outbreaks when demand for PPE and other protective materials surges [31,39,41-43].

In addition to PPE and textiles, UV-C technology has applications in surface and air decontamination, further supporting its role in comprehensive infection control measures. However, it is essential to consider the specific requirements for effective UV-C decontamination, such as the intensity and duration of UV-C exposure, the type of UV-C equipment used, and the proper handling of decontaminated items. In conclusion, UV-C technology offers a robust and versatile solution for the sterilization of PPE and textiles in the context of the monkeypox epidemic. By effectively inactivating viral particles on these items, UV-C decontamination helps prevent the spread of the virus and ensures the safety of healthcare workers and patients. As the monkeypox outbreak continues to pose significant challenges, leveraging UV-C technology for PPE and textile sterilization can significantly enhance infection control measures and support effective outbreak management.

As UV-C technology offers significant advantages, several challenges must be addressed to maximize its effectiveness in combating viral epidemics like monkeypox.

• Line-of-Sight Limitation: UV-C radiation is line-of-sight, meaning it cannot penetrate through obstacles or reach shadowed areas. Ensuring comprehensive disinfection requires strategic placement of UV-C devices and potentially multiple light sources.
• Safety Concerns: UV-C radiation can be harmful to human skin and eyes, causing burns and injuries if not properly managed. Safety protocols, such as using automated systems that operate in unoccupied rooms and implementing time delays, are essential to protect individuals from accidental exposure.
• Cost and Accessibility: Implementing UV-C technology can be costly, particularly in low-resource settings. Ensuring that the technology is accessible and affordable in all regions affected by viral epidemics is a critical consideration.

The ongoing evolution of UV-C technology, including the development of UV-C LED systems, offers promising prospects for more efficient and targeted disinfection solutions. UV-C LEDs, with their lower power consumption, longer lifespan, and ability to be tuned to specific wavelengths, represent the next generation of UV-C technology. As research continues, the application of UV-C in combating not only monkeypox but also other emerging infectious diseases will likely expand, solidifying its role as a key tool in public health and infection control [9,44,45].

The application of Ultraviolet-C (UV-C) technology presents a practical and efficient approach to controlling the spread of the monkeypox virus, particularly in healthcare and communal settings where the risk of viral transmission is high. Given that monkeypox can persist on surfaces and be transmitted through contaminated objects, effective surface decontamination becomes a critical aspect of infection control. The fomite transmission of monkeypox, whereby the virus is spread via surfaces and materials touched by infected individuals, underscores the need for rapid, scalable decontamination solutions. UV-C technology, with its proven ability to inactivate viral pathogens, offers a chemical-free method for disinfecting high-touch surfaces such as medical equipment, doorknobs, bed rails, and PPE. Surface decontamination using UV-C is particularly vital in healthcare environments, where the potential for cross-contamination is high. Hospital settings involve a constant influx of patients, healthcare workers, and visitors, all interacting with shared surfaces. In such environments, maintaining a sterile environment through traditional chemical disinfectants can be time-consuming and labor-intensive. Moreover, the frequent use of chemicals may pose risks to both staff and patients due to the potential for respiratory irritation and environmental pollution. UV-C systems, on the other hand, offer the advantage of rapid and efficient disinfection without leaving harmful residues. The deployment of automated UV-C devices in unoccupied patient rooms, operating theaters, and waiting areas can significantly reduce the presence of viable viral particles on surfaces, thereby lowering the risk of fomite transmission. Beyond healthcare facilities, communal settings such as schools, public transportation, and office buildings also benefit from surface decontamination using UV-C technology. In these environments, high-touch surfaces, including handrails, countertops, and seating areas, can serve as vectors for the spread of monkeypox. By integrating UV-C systems into routine cleaning protocols, these public spaces can achieve a higher standard of hygiene, reducing the likelihood of community-based transmission. Importantly, UV-C decontamination can complement existing cleaning strategies, ensuring a layered approach to infection control that minimizes reliance on chemical disinfectants while enhancing overall safety. In addition to surface decontamination, air purification is another critical application of UV-C technology, especially in settings with compromised ventilation. Although monkeypox is primarily transmitted through direct contact with infectious lesions and bodily fluids, there is a potential risk of airborne transmission in enclosed spaces where airflow is limited. UV-C air purification systems can mitigate this risk by reducing the concentration of viral particles in the air. These systems work by exposing circulated air to germicidal UV-C light, which effectively inactivates viral pathogens present in aerosols. In healthcare environments such as hospital wards and intensive care units, where immunocompromised patients are treated, air quality is paramount in preventing the spread of infections. UV-C air purifiers, integrated into heating, ventilation, and air conditioning (HVAC) systems, provide a continuous mechanism for disinfecting air, particularly in areas where mechanical ventilation may be insufficient. The implications of UV-C air purification extend beyond healthcare facilities to public and communal spaces such as airports, shopping centers, and classrooms, where large groups of people gather. In these settings, poor ventilation and high occupancy rates increase the risk of viral transmission, particularly in densely populated areas. UV-C systems offer a scalable solution for improving air quality, reducing the viral load in the atmosphere, and protecting vulnerable populations from airborne pathogens. By integrating UV-C technology into existing air purification systems, facilities can achieve continuous disinfection, providing a safer environment for occupants. In conclusion, the practical applications of UV-C technology in surface decontamination and air purification highlight its value as a critical tool in controlling the spread of the monkeypox virus. Through its effective inactivation of viral pathogens on surfaces and in the air, UV-C technology addresses key transmission pathways of the virus, offering a versatile and scalable solution for epidemic management in both healthcare and community settings.

Effectiveness of UV-C technology in different environments

The effectiveness of UV-C technology varies significantly depending on the environment in which it is applied, particularly with respect to foot traffic, surface types, and ventilation systems. In hospitals, UV-C technology has proven to be highly effective for sterilizing both air and surfaces. This is largely due to the controlled environment, where UV-C systems can be deployed in unoccupied rooms for surface decontamination and integrated into HVAC systems for air purification. Hospital settings also tend to have high-touch surfaces (e.g., medical equipment, bedrails, doorknobs), which are prime areas for contamination. The frequent cleaning protocols and structured workflows in healthcare facilities make UV-C particularly valuable in reducing Healthcare-Associated Infections (HAIs).

In contrast, schools and public spaces present different challenges. Schools often have high foot traffic, and surfaces like desks, door handles, and communal spaces can serve as vectors for viral transmission. The frequent use of such areas complicates the application of UV-C technology, as it may not be practical to deploy UV-C systems during school hours when students are present. Additionally, the mix of surface types—ranging from porous materials like fabrics to non-porous surfaces like metal and plastic—can affect UV-C’s efficacy. While UV-C can inactivate pathogens on non-porous surfaces quickly, porous surfaces may require prolonged exposure or additional disinfection methods.

Public spaces, such as airports, shopping malls, and public transportation, face similar challenges due to unpredictable traffic patterns and less controlled environments. In such settings, UV-C air purification systems can be integrated into ventilation systems to continuously disinfect the air. However, the effectiveness of UV-C for surface disinfection is more limited, as it may be difficult to ensure that UV-C light reaches all surfaces in crowded and obstructed areas [46-50].

Environment UV-C application expected efficacy

Hospitals Surface decontamination and air purification High, due to controlled environments, high-touch surfaces, and frequent cleaning protocols Schools Surface and air disinfection Moderate, effective during off-hours or in unoccupied spaces; limited by high foot traffic Public Spaces Air purification and occasional surface disinfection Variable, dependent on foot traffic and space layout; effective in well-ventilated areas Operational Guidelines for UV-C Systems.

To ensure safe and effective use, operational guidelines for UV-C systems must be strictly followed. The optimal placement of UV-C lamps is critical, as UV-C light operates in a line-of-sight manner, meaning it cannot penetrate obstacles or shadowed areas. To maximize coverage, UV-C devices should be placed in central locations and in multiple angles if possible, ensuring that light reaches all target surfaces.

Furthermore, UV-C exposure can be harmful to human skin and eyes. Therefore, it is essential to implement time delays that allow personnel to vacate the room before the system is activated. Alternatively, UV-C devices should be automated to operate in unoccupied rooms or during off-hours to avoid accidental exposure.

For environments like hospitals or public spaces with a high turnover of occupants, automated UV-C systems that can be scheduled to operate during non-peak hours offer a practical solution. These systems ensure consistent disinfection while minimizing risks to human health [44-49].

Comparison with other disinfection technologies

Compared to traditional chemical disinfectants, UV-C technology offers several unique advantages. One of the most significant benefits is that UV-C disinfection does not leave behind chemical residues. This makes UV-C particularly valuable in sensitive environments such as hospitals, where chemical exposure can pose risks to patients, especially those with respiratory conditions or weakened immune systems. Additionally, UV-C can reduce the reliance on water and harsh cleaning agents, offering an environmentally friendly alternative to chemical disinfection.

However, UV-C technology has its limitations. The line-of-sight limitation of UV-C means that shadowed or obstructed areas may not receive adequate disinfection. This can be mitigated by using multiple UV-C sources or combining UV-C with other cleaning methods. Furthermore, chemical disinfectants may be more effective on porous surfaces where UV-C light penetration is limited. As a result, UV-C is often used in conjunction with chemical disinfectants to ensure comprehensive cleaning [43-48].

Limitations of UV-C technology

While UV-C technology provides a powerful tool for infection control, several limitations must be acknowledged. The first is the line-of-sight limitation, which makes it difficult to ensure complete disinfection in complex environments with numerous obstructions. In such cases, shadowed areas may remain untreated unless multiple UV-C lamps are used.

There are also safety concerns regarding UV-C exposure. Direct exposure to UV-C light can cause burns to human skin and damage to the eyes, necessitating strict operational protocols and safety mechanisms such as motion detectors or automated systems that operate only in unoccupied rooms.

Finally, the cost of UV-C systems can be a significant barrier, particularly for low-resource healthcare facilities. While the long-term benefits of reduced HAIs and reusable PPE can offset the initial costs, many institutions may struggle with the upfront investment required to implement UV-C technology on a wide scale.

In conclusion, while UV-C technology offers distinct advantages, careful consideration of its limitations, operational requirements, and integration with other disinfection methods is necessary to maximize its effectiveness [48,49].

Cost-benefit analysis of UV-C technology

The adoption of UV-C technology for infection control, particularly during viral outbreaks like the monkeypox epidemic, involves a significant initial investment. The costs associated with purchasing and installing UV-C systems, whether for surface decontamination, air purification, or PPE sterilization, can be substantial. These systems typically require specialized equipment, such as UV-C lamps or UV-C LED arrays, and may necessitate modifications to existing infrastructure, particularly in healthcare facilities and large public spaces. Additionally, the cost of maintenance, including periodic replacement of lamps and cleaning of UV-C devices, adds to the overall investment. However, the long-term benefits of UV-C technology can outweigh these initial costs, particularly when considering its potential to reduce Healthcare-Associated Infections (HAIs). HAIs represent a significant financial burden to healthcare systems globally, both in terms of direct treatment costs and the extended length of hospital stays associated with infection complications. Research suggests that effective UV-C decontamination protocols can significantly reduce the incidence of HAIs by disinfecting high-touch surfaces, medical instruments, and patient rooms with minimal labor costs. This reduction in HAIs not only improves patient outcomes but also translates to substantial cost savings for healthcare facilities by lowering infection treatment expenditures and shortening hospital stays [44-47].

Another critical advantage of UV-C technology is its role in mitigating Personal Protective Equipment (PPE) shortages. During epidemics, such as monkeypox and the COVID-19 pandemic, demand for PPE often outstrips supply, leading to severe shortages that put healthcare workers at risk. UV-C sterilization of PPE, particularly masks and gowns, allows for safe reuse, thus reducing the need for constant resupply and alleviating pressure on supply chains. The ability to reuse PPE without compromising safety results in significant cost savings, especially during prolonged outbreaks when PPE scarcity can lead to inflated prices. This makes UV-C technology a valuable investment for both high-resource and low-resource settings, where PPE shortages are often more pronounced. For low-resource settings, the cost-effectiveness of UV-C technology becomes even more critical. While the initial investment may be prohibitive for some facilities, the long-term savings from preventing widespread infection and reducing PPE consumption can make UV-C systems an attractive solution. Implementing UV-C technology can reduce reliance on chemical disinfectants, which are not only costly but also require ongoing procurement and storage. In these settings, a cost-benefit analysis suggests that UV-C technology may offer a sustainable and scalable solution for infection control, provided that initial funding for equipment can be secured [42-48].

Environmental impact assessment of UV-C technology

From an environmental perspective, UV-C technology offers distinct advantages over traditional chemical-based decontamination methods. One of the most notable environmental benefits is the reduction in water consumption. Chemical disinfectants require significant amounts of water for dilution, application, and rinsing, particularly in large-scale cleaning operations in hospitals and public facilities. The widespread use of these chemicals also leads to water contamination, as disinfectant residues are often flushed into wastewater systems, contributing to environmental degradation. In contrast, UV-C technology operates without the need for water, making it a water-efficient alternative that helps conserve resources, especially in regions facing water scarcity. However, energy consumption remains a key environmental concern for UV-C systems, particularly those using traditional mercury-based UV-C lamps. These lamps can be energy-intensive, contributing to a higher environmental footprint in terms of electricity usage. Additionally, the presence of mercury in these lamps poses disposal challenges, as improper handling can lead to mercury contamination, which is hazardous to both human health and the environment. In recent years, the development of UV-C LED technology has addressed some of these environmental concerns. UV-C LEDs consume significantly less energy than traditional mercury lamps, resulting in lower electricity costs and a reduced environmental footprint. Moreover, UV-C LEDs have a longer lifespan, which decreases the frequency of replacements and reduces waste. These advantages make UV-C LED systems a more sustainable option, particularly in healthcare and public settings that require continuous or frequent use of decontamination technologies. Additionally, the absence of mercury in UV-C LEDs eliminates the hazardous waste disposal issues associated with mercury-based lamps, further contributing to their environmental appeal. In conclusion, while the initial costs of UV-C systems can be high, the long-term cost savings from reduced HAIs, fewer PPE shortages, and the prevention of widespread infections make UV-C technology a valuable investment. Moreover, its environmental benefits, particularly in terms of water conservation and the reduced energy consumption of UV-C LEDs, position it as a more sustainable alternative to traditional chemical disinfection methods. These factors underscore the importance of UV-C technology not only as a tool for epidemic control but also as part of a broader strategy for sustainable and cost-effective infection prevention [47-50].

The resurgence of monkeypox as a significant public health challenge underscores the urgent need for effective decontamination strategies to manage and mitigate its spread. Ultraviolet-C (UV-C) technology, with its established role in sterilization and disinfection, presents a promising tool for controlling the monkeypox epidemic. This conclusion synthesizes the advantages of UV-C decontamination across different applications—surface, air, and PPE—while also addressing considerations related to environmental impact and the water footprint of alternative decontamination methods.

UV-C technology has long been recognized for its potent germicidal properties, particularly effective against viruses like monkeypox. UV-C light, with wavelengths between 200 and 280 nm, can disrupt the DNA of microorganisms, rendering them inactive and preventing further replication. This characteristic makes UV-C highly suitable for addressing the transmission pathways of monkeypox, which primarily include direct contact with lesions, body fluids, and contaminated surfaces.

In healthcare settings, UV-C decontamination can play a crucial role in reducing the risk of surface-borne transmission. By utilizing UV-C systems to disinfect patient rooms, high-touch surfaces, and communal spaces, healthcare facilities can significantly decrease the likelihood of fomite transmission. Similarly, UV-C air purification systems can address the risk of airborne transmission, even though monkeypox is less likely to spread through aerosols compared to other viruses. By reducing the concentration of viral particles in the air, UV-C can enhance overall infection control measures.

The decontamination of Personal Protective Equipment (PPE) using UV-C technology also represents a critical application, especially given the importance of PPE in protecting healthcare workers and managing outbreaks. UV-C systems can effectively sterilize masks, gowns, and gloves, allowing for their safe reuse and mitigating the impact of supply shortages during crises.

While UV-C technology offers significant benefits, its implementation is not without environmental considerations. Traditional chemical decontaminants, such as disinfectants and sterilants, have known environmental impacts, including water pollution and harmful by-products. UV-C technology, in contrast, does not rely on chemicals and thus avoids these issues. However, it is essential to consider other environmental factors associated with UV-C systems.

One important aspect to address is the energy consumption of UV-C systems. UV-C lamps, particularly mercury vapor lamps, can consume substantial amounts of electricity. The environmental impact of this energy use should be weighed against the benefits of reducing infectious disease transmission. Advances in UV-C technology, such as the development of UV-C LEDs, offer a more energy-efficient alternative with reduced environmental footprint. UV-C LEDs provide targeted wavelengths, longer lifespans, and lower power consumption, thus presenting a more sustainable option for decontamination.

Additionally, the production and disposal of UV-C lamps can have environmental implications. Mercury-containing lamps, while effective, pose challenges related to safe disposal and potential mercury contamination. The transition to UV-C LEDs or other non-mercury-based systems can help mitigate these concerns.

Another critical environmental consideration is the water footprint of decontamination methods. Traditional liquid disinfectants and cleaning agents often require significant water usage for dilution and application, leading to increased water consumption and potential contamination of water sources. In contrast, UV-C decontamination does not involve water in its process, offering a more water-efficient solution. By reducing the need for water-intensive chemical processes, UV-C technology helps conserve water resources and minimizes the risk of water pollution.

To maximize the benefits of UV-C decontamination while minimizing environmental impact, a balanced approach is essential. Implementing UV-C technology in conjunction with other infection control measures can enhance overall effectiveness. For instance, using UV-C for surface and air decontamination while integrating regular cleaning and disinfection practices can provide a comprehensive strategy for managing monkeypox.

Furthermore, ongoing research and development in UV-C technology should focus on improving energy efficiency, reducing hazardous materials, and exploring sustainable alternatives. The adoption of UV-C LEDs and other innovations represents a step toward more environmentally friendly decontamination solutions.

In conclusion, UV-C technology presents a valuable tool for addressing the monkeypox epidemic, offering effective solutions for surface, air, and PPE decontamination. While the traditional applications of UV-C provide promising outcomes, careful consideration of environmental impacts and the water footprint of decontamination methods is crucial. By balancing efficacy with sustainability, UV-C technology can play a pivotal role in controlling outbreaks and protecting public health.

This review is part of the project titled "Design of Protective Mask and UV Decontamination Box against Biological Threats," which was conducted as part of a master’s thesis at Pamukkale University. The research was funded by the Scientific Projects Coordination of Pamukkale University under the reference number 2022FEBE050. We gratefully acknowledge their support.

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