Good questions, again.
What happens once the virus is attached to the nanoviricide is that the shell of the virus falls apart. Thus the virus "dies". From that moment on, the nanoviricide might be able to be "reused". To kill off other virus particles in the body. However I'm not sure if this mechanism is true or not.
If you imagine soap used for cleaning a oily mark on your skin, when the oil particles have been covered by soap particles, it can sometimes disintegrate the oil into the media around it... (water). I'm not sure if this has a positive or negative effect on the available soap particles for further cleaning of oil...
Anyhow, ofcourse, you need millions of nanoviricide. Maybe even billions. Thus the theory is you need to re-dose every now and then... Its chronic therapy. Which is resolved when there is a cure for the virus its self or when all the cells die which are hosts.
When virus outbreaks happen, nanoviricide provides the time buffer to develop vaccines/cures..etc.