and we have three or four studies showing it's going down to 40 to 50%. and -- and that's concerning. the good news is, if you got the pfizer-biontech vaccine, like i did, i feel comfortable that i'm not going to go to the hospital. or -- or the intensive-care unit. but the question's going to be what's the trigger from usfda and cdc to say whom, maybe, we should think about a third immunization. adding to the confusion is the fact that we don't really know if this is waning immunity, declining immunity, or if it's something unique to the delta variant because the two things are happening, at once. and then, finally, there is a lot of data that's out there that's not publicly available. so, i'm pretty confident, all these discussions are going on between the companies and the fda and cdc. so we will see if, tomorrow, when they announce the third immunization for immunocompromised individuals, and we will see which immune-compromised conditions they are looking at beyond solid organ transplant recipients. whether they will give us a hint