LAUSR

To the Editor(s): In beginning era of the twenty-first century, many viral infections have attacked the human body. Severe Acute Respiratory Syndrome (SARS), Middle East Respiratory Syndrome (MERS) are few examples of these infections [1]. Now a days, COVID-19 pandemic has appeared in existence till December 2019. Though the mortality rate due to SARSCoV-2 is less, but the transmission capability is very high compared to the other viruses. Till the end of April, 2020, three millons people have been infected across the world due to this rapidly growing pandemic. Research works have been reported to reduce the transmission of infection in various dimensions [2, 3]. But there is no alternative rather than handling the essential food items which are purchased from the market. So, SARSCoV-2 virus can easily be transmitted from human to human through food commodities. Ultraviolet (UV) exposure based cheap method has been proposed for chemical free disinfection of the food items which can be easily designed at home with less technical knowledge. UV-C light is required to be exposed into the food for disinfection purpose [4, 5]. There are three types of UV rays namely UV-A, UV-B, UV-C [4]. Wavelength of UV-A ray in the electromagnetic spectrum lies between 315 nm to 400 nm. Wavelength range of UV-B light is 280 nm to 315 nm. Wavelength of UV-C light lies between 100 nm to 280 nm. A wooden box has been prepared to disinfect the food items from the virus. Since UV-C light is harmful to skin, it is very much essential to disinfect the food items in a closed environment so that it does not come in contact with any human or animal. To meet this vital requirement, a closed wooden box is utilised to disinfect the food items which ensures the safety of human skin from UV-C light. Six number of lamps emitting UV-C light and a food holder are placed in the box for the operation. Arrangement of food holder and UV-C lamps inside the box is shown in fig. 1. Food is kept in the net type holder before supplying the power for 15 min. The net type holder will produce shadow in the bottom side of the food. Multiple lamps in different positions are placed to ensure the presence of light in the complete surface of food during operation. UV-C light is found to be effective to disinfect the food commodities without producing any chemical residue [5]. Advantage of the system is that it may be cheaply developed at home with less technical knowledge. In lockdown situation under rapidly growing COVID-19 pandemic, it becomes important to prepare such system at home to disinfect the food items before handling. However, the taste of the food changes to a certain extend after processing [5]. Change of taste of food items is dependent upon the processing time and temperature parameters. In summary, a cheap and simple method has been proposed for disinfecting the food items from SARS-CoV-2 virus during rapidly growing COVID-19 pandemic situation. Here, UV-C light is exposed to the food for disinfection purpose. No chemical residue is produced in the process. Also, this system may be developed at home with less technical knowledge. Limitation of the process is that the taste of food gets changed to some extend depending upon the processing time and temperature. Considering the present pandemic situation, this homemade system may become very helpful to break the chain of SARS-CoV-2 transmission occurring from the food items. This article is part of the Topical Collection on Education & Training