Full vaccination with any of the anti - COVID-19 vaccines that have been granted WHO emergency use listing (EUL), provide substantial protection against the COVID-19 disease, especially severe disease, hospitalization, or death, as long as all the required doses have been taken. This is true for all current variants of concern, including the Delta variant.
Along with vaccination, WHO recommends continuing to wear a mask, avoid crowds, and wash hands regularly with soap and water.