among older patients and people with other health conditions, they said. back with us tonight, dr. vin gupta, critical care pulmonologist in seattle, he has advised us on the pandemic since its early days. he is also on the faculty of the university of washington institute for health metrics and evaluation. vin, good to see you, as always, my friend. these increased hospitalizations, which we were seeing prior to the onset of omikron, are these mostly delta hospitalizations? or omicron hospitalizations? or do we know? >> ali, great to see you. the answer is, we don't know. of all the tests that ultimately get sent to an advanced lab, it is sequenced, genetically sequenced and most are coming back omicron positive. i think it is fair to say that it has been important, just to emphasize this to your viewers out there, that these vaccines are doing exactly what they