mostly delta hospitalizations or omicron hospitalizations, or widow we not know? >> ali, good evening. great to see you. the answer is we don't know. what we do know is that omicron is of all the tests that ultimately get sent to an advanced lab to get sequenced, most of the now are coming back omicron positive. i think it's a fair bet to say it's probably a bit of both. really important, just to emphasize this to all your viewers out there, that these vaccines are doing exactly what they should. vaccines against a contagious respiratory virus never were meant to preventative positive test for mild symptoms. they were only meant to keep folks out of the hospital. that's why we say get the flu shot. flu does not prevent a positive test. it only keeps you out of the hospital. same paradigm here. it's entirely expected and not surprising. >> vin, what do you know about the degree to which this is