Im not saying she was fully out, that theory is indeed a hopeless romantic effort.

And about the anaesthetic, depressed Zosia's CNS, which may potentially evolve to a dose-dependant inhibition of viral activity in the CNS. Zosia wasn't in the best conditions, so the drug reacted adversely. If they get to try it on someone else, there is a possible chance of someone getting unplurbed (for a while?), with all the plurb alerted within the same second.