that have done individually and cooled in mice and hamster models, it was shown the virus of omicron pro live rates very well in the upper airway and bron kai, but very poorly in the lungs, which actually goes along with -- doesn't prove but goes along with the concept that you have a very transmissible virus with upper airway secretion, but a virus that has less pathogenicity in the lung. next slide. let's look at the bottom line of what i said, and i'll get to the caveat in a moment. multiple sources of now preliminary data indicate a decreased severity with omicron. however, we really do need more definitive assessment of severity with longer-term followup here and in different countries. but the big caveat is we should