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Get vaccination rates high enough, that would make us more safe from the evolution of yet more lethal, yet more scary variants. but if vaccination doesn't reduce the amount of virus in our noses, if vaccination doesn't prevent us from being able to pass infection to other people, is it still true, should we still understand thatt proportion of the population is our best path toward heading off the prospect of the lambda variant or other, even scarier variants that might emerge frome this virus, in the future? >> great question, rachel, and the answer to the question is, absolutely, vaccination...

Wealthy nations eye booster shots while poor countries lack even first doses. That’s a recipe for rising deadly variants everywhere.

This is a virus that is not only more contagious but potentially more lethal. >> reporter: experts say vaccinations are key against protecting against future variants. >> if you are giving the virus a chance to change, you are leading to a vulnerability for a worse variant. that will impact not only the unvaccinated, that will impact the vaccinated. >> reporter: the new orleans jazz fest organizers say that event will be canceled due to louisiana's surge in covid-19 cases. >> llucy, thank you. as i told you earlier, the cdc says nearly everyone who has been fully vaccinated, more than 99.9% ...

The virus can jump from person to person and lead to variants. >> let's talk about that because we talked so much about the delta variant, how it's changed the footing in the u.s. now officials are watching another variant, this lambda variant. tell us about this. >> that's right. the lambda variant has been emerging in conversations, there are about 1,000 cases identified here in the united states. but that number, victor, is still very small compared to the many cases that the delta variant has caused here in the u.s. so the lambda variant is not as of concern. the world health organization ...

Variants of interest. overall we held from the national institutes of health director, dr. collins, he said these variants, they're watching them closely. have a listen. >> at nih, working with fda and cdc, we have a vigorous team that looks at every knew emerging variant to see what would its effect be in terms of the vaccine. will the vaccine work against this one? so far so good. we don't have anxieties yet about delta or lambda or any others working out there. >> so you see, he said they don't have anxieties yet. again, delta is the biggest concern for us in the u.s. >> jacqueline howard, ...