report is that they have studied people who got vaccinated with the chinese vaccine which is known to be poorly effective. we've got to remember that you've got two levels of immunity when you are immune. antibodies and the memory b cells and t cells bear the memory b cells and t cells encompass all variants and they have encompassed every variant in preventing severe illness and death and that is 100% bulletproof because -- >> sean: dr., i don't want to interrupt you but i want to highlight what you are saying here and that is even after antibody levels, if you had covid-19, you still have t cell antibodies and as you rightly point out, that probably is the best immunity one could have because your body would instantly recognize any variant of any coronavirus. is that correct? then immediately the body would begin its immune defenses? >> that is exactly right. when you have immunity you've got this army of memory b cells and t cells that will protect