A study published in The New England Journal of Medicine in March 2020 shows that copper has a biocidal action on COVID-19 which it eradicates in less than 4 hours. Other scientific sources further state that in the meantime, the virus loses its virulence.

The text of this study can be consulted HERE: Aerosol and Surface Stability of SARS-CoV-2 as Compared with SARS-CoV-1