 Silver nanoparticles have been shown to be effective against HIV-1 at low concentrations, suggesting they may be useful for preventing the spread of the virus. The particles appear to act by blocking the virus from attaching to cells and entering the cell, as well as interfering with its ability to replicate once inside the cell. This makes them a potential tool for preventing the spread of HIV-1, as well as treating existing cases. This article was authored by Rodríguez Padila-Christina, Ixtapantarant Liliana, Ayala Núñez Nilda V, and others.