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Most pandemic restrictions have been lifted across the country with new york and california literally celebrating hitting the 70% adult vaccination mark just yesterday. but that's far from the case everywhere as we warn folks. there are stark new warnings tonight about the dangerous delta variant. our report from nbc news correspondent blayne alexander. >> reporter: experts predict the delta variant could be the dominant covid strain in the u.s. >> it is more trance missible and poerm for dangerous. >> reporter: accelerating the rush to get americaning vaccinated but the biden administration i...

Concerned should we all be about what's happening now? >> i think the public health community has to be very concerned and pay attention to this. this virus, called a bird flu virus and having trouble finding in it a lot of birds. that's worrisome. when i talked to people at cdc, they see changes in this virus which put it on the path to being able to go person to person and as you know that's what you worry about for a strain with pandemic potential so i'm glad they're jumping on this, glad cdc is working on vaccines and diagnostic kits because you never know which virus makes that turn and b...

Application that would call for what is referred to as gain of function. gain of function means taking a virus that could infect humans and making it more trance missible or pass able to humans. >> bill: take the value of the dollars he mentioned, $600,000 over five years. is that a lot, does it matter? >> it is a lot. some reports it added up to millions over time. the other thing he said there was no gain of function in the application. there are scientists who looked at the application and absolutely disagree with you. they say the application did include gain of function. the other evidenc...