months after your last shot whether it's a booster or your -- your second injection, those health passes will expire. so, that -- you know, common sense leads us to believe that means there is going to have to be another booster after that if these health passes expire. israel led the way in the first round of vaccinations so if they are going to be requiring a fourth booster -- or a second booster, i guess it would be, a fourth shot, we can expect very much the same here across europe i think, kim. >> we will be watching as you say. turning now to steven, this plan to disinfect the whole city, xian. not a small city by any means, some 9 million people in the city proper. millions more in the greater area. how will they go about doing this? >> that's right, kim. you know, you probably went there for the terra-cotta warriors. it is a major tourist center and sprawling metropolis with 13 million residents in the metro area. but now, of course, it's pretty much all shut down with the local authorities you mentioned