It must be stressed that this is of course still an experimental treatment, although there is clearly a lot of emerging evidence that antibodies are important in fighting COVID19. So there is a reasonable hope that recipients of this treatment like this will most likely experience at least some degree of protection from the COVID19 virus which is not dependent on their own immune system.

"Oxford vaccine causes double defence against COVID-19" was the overnight breaking news in the Telegraph. I cannot confirm or deny this leak. But this article aims to put it in context.