getting surveillance screening, they did see waning of the vic effectiveness overall. but that is not reflective how well it works against what we wa want it to work for which is severe disease. and let me show you the data on that. the vaccine and hospitalizations and deaths, poppy, it is really good. it is been good. it remains good. and we haven't seen data certainly from this country at least to suggest that that is a problem, that that is waned in some way. but these are the exact questions now that are sort of informing these decisions. this is what the advisory committee to the cdc is asking, has the vaccine demonstrated that it is waning in terms of its effectiveness. has the delta variant changed things? has the delta variant reduced that effectiveness. do we need to be looking at this in terms of specific populations. if you're a young person, i'm 51, my parents are in their late