Nano-Shield is EPA registered, approved to use against SARS and, COV-2, the virus that causes COVID-19. The primary vector for the transmission of the Coronavirus is cross contamination, which is when an infected person touches or coughs on a surface which in turn infects others who touch it later. Doorknobs, handrails, countertops, or any commonly touched surface can become a source of disease in the home as well as public places.