Except that giving someone nanoviricides might reduce the virus in that patient to zero, but so far we don't know that it gives that patient any immunity to future infection with the same virus. So at any one time there will be people infected with the virus and they can infect other people, including those previously treated with nanoviricides. It is only by vaccination that you can induce immunity and so progressively reduce the at-risk population. I have wondered if treatment with nanoviricides can induce immunity. If the treatment were to create fragments of the viral envelope with protein antigens then the macrophages and dendritic cells might be able to use that to induce immunity. It would be an "in situ" vaccination if you like. A lot of research would be needed to check this out.