and as joined by one of the authors of the lancet article and professor of immunology at imperial college downey and he told me that different types in amounts of immunity cells and antibodies need to be studied we desperately need antibody casting in general so you know scientists talk about 0 prevalence that's measuring antibodies in the population as widely as possible to understand who's seen as far as you have them and better we all think all over the world is desperately important and we're all scrambling for data because if we haven't got that data you know we haven't got a clue how widely the viruses spread how wide herd immunity is so that's that's one point that's not quite the same as whether there is there are you in the future in some kind of an antibody passport to say only the individual level who safe to go to work and who isn't which is a whole other ballgame and much more worrying why is there a question over this because obviously the virus has been around for a little while now and of course most antibodies do work for most diseases that right to say so why is a question over