benefits on both sides. tough stuff. >> how long do you think it will take for scientists to determine whether this new variant oma cron, is -- if our current vaccines that we're using are effective against oma cron? >> i think it might take in the laboratory a week or a little bit more. but we will be getting data on almost a daily basis to give us a better sense of that. and you can imagine that the vaccine scientists already are thinking about how to modify our current vaccines to cope with oma crom if that is necessary. >> even before we heard about this new designation, we knew that europe is seeing a spike in covid cases. do you think that that is a harbinger of what is about to happen in the u.s.? >> well let's come back to the u.s. for a moment. where we have the delta variant, which is the most common around